Canon 1Ds vs Leica Q Typ 116
The Canon EOS-1Ds and the Leica Q (Typ 116) are two digital cameras that were revealed to the public, respectively, in September 2002 and June 2015. The 1Ds is a DSLR, while the Q Typ 116 is a fixed lens compact. Both cameras are equipped with a full frame sensor. The Canon has a resolution of 11 megapixels, whereas the Leica provides 24 MP.
Below is an overview of the main specs of the two cameras as a starting point for the comparison.
Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS-1Ds and the Leica Q (Typ 116)? Which one should you buy? Read on to find out how these two cameras compare with respect to their body size, their imaging sensors, their shooting features, their input-output connections, and their reception by expert reviewers.
An illustration of the physical size and weight of the Canon 1Ds and the Leica Q Typ 116 is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive views from the front, the top, and the rear side are shown. All width, height and depth dimensions are rounded to the nearest millimeter.
The Q Typ 116 can be obtained in two different colors (black, silver), while the 1Ds is only available in black.
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Leica Q Typ 116 is considerably smaller (58 percent) than the Canon 1Ds. It is worth mentioning in this context that the 1Ds is splash and dust resistant, while the Q Typ 116 does not feature any corresponding weather-sealing.
The above size and weight comparisons are to some extent incomplete and possibly misleading, as the Q Typ 116 has a lens built in, whereas the 1Ds is an interchangeable lens camera that requires a separate lens. Attaching the latter will add extra weight and bulk to the setup. You can compare the optics available for the 1Ds and their specifications in the Canon EF Lens Catalog.
Concerning battery life, the 1Ds gets 600 shots out of its NP-E3 battery, while the Q Typ 116 can take 300 images on a single charge of its BP-DC12 power pack. As can be seen in the images above, the 1Ds has a battery grip built in. This facilitates image-taking in portrait orientation and gives it additional battery power.
The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. If you want to switch the focus of the display and review another camera pair, you can move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.
|1.||Canon 1Ds||156 mm||158 mm||80 mm||1265 g||600||Y||Sep 2002||8,999|
|2.||Leica Q Typ 116||130 mm||80 mm||93 mm||640 g||300||n||Jun 2015||4,249|
|3.||Canon 1D X Mark III||158 mm||168 mm||83 mm||1440 g||2850||Y||Jan 2020||6,499|
|4.||Canon 1D X Mark II||158 mm||168 mm||83 mm||1530 g||1210||Y||Feb 2016||5,999|
|5.||Canon T6i||132 mm||101 mm||78 mm||555 g||440||n||Feb 2015||749|
|6.||Canon T6s||132 mm||101 mm||78 mm||565 g||440||n||Feb 2015||649|
|7.||Canon G7 X||103 mm||60 mm||40 mm||304 g||210||n||Sep 2014||699|
|8.||Canon 1D C||158 mm||164 mm||83 mm||1545 g||1120||Y||Apr 2012||14,999|
|9.||Canon 1D Mark IV||156 mm||157 mm||80 mm||1230 g||1500||Y||Oct 2009||4,999|
|10.||Canon 1D Mark III||156 mm||157 mm||80 mm||1155 g||2200||Y||Feb 2007||4,499|
|11.||Canon 1Ds Mark III||150 mm||160 mm||80 mm||1385 g||1800||Y||Aug 2007||7,999|
|12.||Canon 1D Mark II N||156 mm||158 mm||80 mm||1565 g||1200||Y||Aug 2005||3,999|
|13.||Canon 5D||152 mm||113 mm||75 mm||895 g||400||Y||Aug 2005||3,299|
|14.||Canon 1D Mark II||156 mm||158 mm||80 mm||1535 g||1200||Y||Jan 2004||4,499|
|15.||Canon 1Ds Mark II||156 mm||158 mm||80 mm||1215 g||1200||Y||Sep 2004||7,999|
|16.||Leica Q2||130 mm||80 mm||92 mm||718 g||370||Y||Mar 2019||4,995|
|17.||Sony RX100 IV||102 mm||58 mm||41 mm||298 g||280||n||Jun 2015||999|
|Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.|
Any camera decision will naturally be influenced heavily by the price. The manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. The Q Typ 116 was launched at a lower price than the 1Ds, despite having a lens built in. Usually, retail prices stay at first close to the launch price, but after several months, discounts become available. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.
The size of the sensor inside a digital camera is one of the key determinants of image quality. A large sensor will tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixel-units in a sensor of the same technological generation. Furthermore, a large sensor camera will give the photographer more possibilities to use shallow depth-of-field in order to isolate a subject from the background. On the downside, larger sensors tend to be more expensive and lead to bigger and heavier cameras and lenses.
Both cameras under consideration feature a full frame sensor, but their sensors differ slightly in size. The sensor area in the Q Typ 116 is 1 percent bigger. They nevertheless have the same format factor of 1.0. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.
In terms of underlying technology, both cameras are build around CMOS sensors.
With 24MP, the Q Typ 116 offers a higher resolution than the 1Ds (11MP), but the Q Typ 116 has smaller individual pixels (pixel pitch of 6.00μm versus 8.83μm for the 1Ds). Yet, the Q Typ 116 is a much more recent model (by 12 years and 8 months) than the 1Ds, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixel-units.
The resolution advantage of the Leica Q Typ 116 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the Q Typ 116 for good quality output (200 dots per inch) amounts to 30 x 20 inches or 76.2 x 50.8 cm, for very good quality (250 dpi) 24 x 16 inches or 61 x 40.6 cm, and for excellent quality (300 dpi) 20 x 13.3 inches or 50.8 x 33.9 cm. The corresponding values for the Canon 1Ds are 20.3 x 13.5 inches or 51.6 x 34.3 cm for good quality, 16.3 x 10.8 inches or 41.3 x 27.5 cm for very good quality, and 13.5 x 9 inches or 34.4 x 22.9 cm for excellent quality prints.
The Canon EOS-1Ds has a native sensitivity range from ISO 100 to ISO 1250, which can be extended to ISO 50-1250. The corresponding ISO settings for the Leica Q (Typ 116) are ISO 100 to ISO 50000 (no boost).
Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. This service assesses and scores the color depth ("DXO Portrait"), dynamic range ("DXO Landscape"), and low-light sensitivity ("DXO Sports") of camera sensors, and also publishes an overall camera score. Of the two cameras under consideration, the Q Typ 116 offers substantially better image quality than the 1Ds (overall score 22 points higher). The advantage is based on 2.5 bits higher color depth, 1.7 EV in additional dynamic range, and 1.2 stops in additional low light sensitivity. The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.
| DXO |
|1.||Canon 1Ds||Full Frame||11.0||4064||2704||none||21.8||11.0||954||63|
|2.||Leica Q Typ 116||Full Frame||24.0||6000||4000||1080/60p||24.3||12.7||2221||85|
|3.||Canon 1D X Mark III||Full Frame||20.0||5472||3648||4K/60p||24.2||14.5||3248||91|
|4.||Canon 1D X Mark II||Full Frame||20.0||5472||3648||4K/60p||24.1||13.5||3207||88|
|7.||Canon G7 X||1-inch||20.0||5472||3648||1080/60p||23.0||12.7||556||71|
|8.||Canon 1D C||Full Frame||17.9||5184||3456||4K/24p||..||..||..||..|
|9.||Canon 1D Mark IV||APS-H||16.0||4896||3264||1080/30p||22.8||12.0||1320||74|
|10.||Canon 1D Mark III||APS-H||10.1||3888||2592||none||22.7||11.7||1078||71|
|11.||Canon 1Ds Mark III||Full Frame||21.0||5616||3744||none||24.0||12.0||1663||80|
|12.||Canon 1D Mark II N||APS-H||8.2||3504||2336||none||22.3||11.2||975||66|
|13.||Canon 5D||Full Frame||12.7||4368||2912||none||22.9||11.1||1368||71|
|14.||Canon 1D Mark II||APS-H||8.2||3504||2336||none||22.3||11.1||1003||66|
|15.||Canon 1Ds Mark II||Full Frame||16.6||4992||3328||none||23.3||11.3||1480||74|
|16.||Leica Q2||Full Frame||46.7||8368||5584||4K/30p||26.4||13.5||2491||96|
|17.||Sony RX100 IV||1-inch||20.0||5472||3648||4K/30p||22.8||12.6||591||70|
Many modern cameras are not only capable of taking still images, but can also record movies. The Q Typ 116 indeed provides for movie recording, while the 1Ds does not. The highest resolution format that the Q Typ 116 can use is 1080/60p.
Apart from body and sensor, cameras can and do differ across a range of features. For example, the Q Typ 116 has an electronic viewfinder (3680k dots), while the 1Ds has an optical one. Both systems have their advantages, with the electronic viewfinder making it possible to project supplementary shooting information into the framing view, whereas the optical viewfinder offers lag-free viewing and a very clear framing image. The adjacent table lists some of the other core features of the Canon 1Ds and Leica Q Typ 116 along with similar information for a selection of comparators.
|2.||Leica Q Typ 116||3680||n||3.0||1040||fixed||Y||1/2000s||10.0||n||Y|
|3.||Canon 1D X Mark III||optical||Y||3.2||2100||fixed||Y||1/8000s||20.0||n||n|
|4.||Canon 1D X Mark II||optical||Y||3.2||1620||fixed||Y||1/8000s||16.0||n||n|
|7.||Canon G7 X||none||n||3.0||1040||tilting||Y||1/2000s||6.5||Y||Y|
|8.||Canon 1D C||optical||Y||3.2||1040||fixed||n||1/8000s||14.0||n||n|
|9.||Canon 1D Mark IV||optical||Y||3.0||920||fixed||n||1/8000s||10.0||n||n|
|10.||Canon 1D Mark III||optical||Y||3.0||230||fixed||n||1/8000s||10.0||n||n|
|11.||Canon 1Ds Mark III||optical||Y||3.0||230||fixed||n||1/8000s||5.0||n||n|
|12.||Canon 1D Mark II N||optical||Y||2.5||230||fixed||n||1/8000s||8.5||n||n|
|14.||Canon 1D Mark II||optical||Y||2.0||230||fixed||n||1/8000s||8.3||n||n|
|15.||Canon 1Ds Mark II||optical||Y||2.0||230||fixed||n||1/8000s||4.0||n||n|
|17.||Sony RX100 IV||2359||n||3.0||1228||tilting||n||1/2000s||16.0||Y||Y|
One feature that is present on the 1Ds, but is missing on the Q Typ 116 is a top-level LCD. While being, of course, smaller than the rear screen, the control panel conveys some of the essential shooting information and can be convenient for quick and easy settings verification.
The reported shutter speed information refers to the use of the mechanical shutter. Yet, some cameras only have an electronic shutter, while others have an electronic shutter in addition to a mechanical one. In fact, the Q Typ 116 is one of those camera that have an additional electronic shutter, which makes completely silent shooting possible. However, this mode is less suitable for photographing moving objects (risk of rolling shutter) or shooting under artificial light sources (risk of flickering).
The Leica Q Typ 116 has an intervalometer built-in. This enables the photographer to capture time lapse sequences, such as flower blooming, a sunset or moon rise, without purchasing an external camera trigger and related software.
The 1Ds writes its imaging data to Compact Flash cards, while the Q Typ 116 uses SDXC cards.
For some imaging applications, the extent to which a camera can communicate with its environment can be an important aspect in the camera decision process. The table below provides an overview of the connectivity of the Canon EOS-1Ds and Leica Q (Typ 116) and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
| WiFi |
| NFC |
|2.||Leica Q Typ 116||Y||stereo||mono||-||-||micro||2.0||Y||Y||-|
|3.||Canon 1D X Mark III||Y||mono||mono||Y||Y||mini||3.1||Y||-||Y|
|4.||Canon 1D X Mark II||Y||mono||mono||Y||Y||mini||3.0||-||-||-|
|7.||Canon G7 X||-||stereo||mono||-||-||micro||2.0||Y||Y||-|
|8.||Canon 1D C||Y||mono||mono||Y||Y||mini||2.0||-||-||-|
|9.||Canon 1D Mark IV||Y||stereo||-||Y||-||mini||2.0||-||-||-|
|10.||Canon 1D Mark III||Y||-||-||-||-||-||2.0||-||-||-|
|11.||Canon 1Ds Mark III||Y||mono||-||-||-||-||2.0||-||-||-|
|12.||Canon 1D Mark II N||Y||-||-||-||-||-||1.1||-||-||-|
|14.||Canon 1D Mark II||Y||-||-||-||-||-||1.1||-||-||-|
|15.||Canon 1Ds Mark II||Y||-||-||-||-||-||2.0||-||-||-|
|17.||Sony RX100 IV||-||stereo||mono||-||-||micro||2.0||Y||Y||-|
It is notable that the Q Typ 116 offers wifi support, which can be a very convenient means to transfer image data to an off-camera location. In contrast, the 1Ds does not provide wifi capability.
Studio photographers will appreciate that the Canon 1Ds (unlike the Q Typ 116) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.
Both the 1Ds and the Q Typ 116 have been discontinued, but can regularly be found used on eBay. The 1Ds was replaced by the Canon 1Ds Mark II, while the Q Typ 116 was followed by the Leica Q2. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Canon and Leica websites.
So how do things add up? Which of the two cameras – the Canon 1Ds or the Leica Q Typ 116 – has the upper hand? Is one clearly better than the other? A synthesis of the relative strong points of each of the models is listed below.
Advantages of the Canon EOS-1Ds:
- Brighter framing: Features an optical viewfinder for clear, lag-free composition.
- Easier setting verification: Features an LCD display on top to control shooting parameters.
- Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/2000s) to freeze action.
- More flexible: Can take a variety of interchangeable lenses, including specialty optics.
- More portrait friendly: Features an integrated vertical grip for easier portrait shooting.
- Longer lasting: Can take more shots (600 versus 300) on a single battery charge.
- Better sealing: Is weather sealed to enable shooting in dusty or wet environments.
- Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
- More heavily discounted: Has been available for much longer (launched in September 2002).
Arguments in favor of the Leica Q (Typ 116):
- More detail: Has more megapixels (24 vs 11MP), which boosts linear resolution by 48%.
- Better image quality: Scores substantially higher (22 points) in the DXO overall evaluation.
- Richer colors: Generates noticeably more natural colors (2.5 bits more color depth).
- More dynamic range: Captures a broader range of light and dark details (1.7 EV of extra DR).
- Better low-light sensitivity: Can shoot in dim conditions (1.2 stops ISO advantage).
- Broader imaging potential: Can capture not only stills but also 1080/60p video.
- More framing info: Has an electronic viewfinder that displays shooting data.
- Larger screen: Has a bigger rear LCD (3.0" vs 2.0") for image review and settings control.
- More detailed LCD: Has a higher resolution rear screen (1040k vs 120k dots).
- Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
- Faster burst: Shoots at higher frequency (10 vs 3 flaps/sec) to capture the decisive moment.
- Less disturbing: Has an electronic shutter option for completely silent shooting.
- Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
- Ready to shoot: Comes with an integrated lens, while the 1Ds requires a separate lens.
- More compact: Is smaller (130x80mm vs 156x158mm) and will fit more readily into a bag.
- Less heavy: Has a lower weight even though it has a lens built in (unlike the 1Ds).
- Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
- Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
- Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
- More prestigious: Has the Leica luxury appeal, which ensures a high resale value.
- More affordable: Was introduced at a lower price, despite coming with a built-in lens.
- More modern: Reflects 12 years and 8 months of technical progress since the 1Ds launch.
If the count of relative strengths (bullet points above) is taken as a measure, the Q Typ 116 is the clear winner of the contest (22 : 9 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features before making a decision on a new camera. A professional wildlife photographer will view the differences between cameras in a way that diverges from the perspective of a family photog, and a person interested in architecture has distinct needs from a sports shooter. Hence, the decision which camera is best and worth buying is often a very personal one.
How about other alternatives? Do the specifications of the Canon 1Ds and the Leica Q Typ 116 place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Prime Lens Compact Camera listings whether the two cameras rank among the cream of the crop.
In any case, while the specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it remains incomplete and does no justice, for example, to the way the 1Ds or the Q Typ 116 perform in practice. User reviews that are available, for instance, at amazon can sometimes shed light on these issues, but such feedback is all too often partial, inconsistent, and inaccurate.
This is why expert reviews are important. The adjacent summary-table relays the overall verdicts of several of the most popular camera review sites (amateurphotographer [AP], cameralabs [CL], dpreview [DPR], ephotozine [EPZ], photographyblog [PB]). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.
|1.||Canon 1Ds||..||..||+ +||..||..||Sep 2002||8,999|
|2.||Leica Q Typ 116||5/5||..||80/100||4.5/5||4.5/5||Jun 2015||4,249|
|3.||Canon 1D X Mark III||..||+ +||..||4.5/5||4/5||Jan 2020||6,499|
|4.||Canon 1D X Mark II||..||..||89/100||4.5/5||4.5/5||Feb 2016||5,999|
|5.||Canon T6i||5/5||..||75/100||4.5/5||4.5/5||Feb 2015||749|
|6.||Canon T6s||5/5||+||77/100||4.5/5||4.5/5||Feb 2015||649|
|7.||Canon G7 X||4/5||+ +||77/100||4.5/5||4.5/5||Sep 2014||699|
|8.||Canon 1D C||..||..||..||..||..||Apr 2012||14,999|
|9.||Canon 1D Mark IV||5/5||..||89/100||..||..||Oct 2009||4,999|
|10.||Canon 1D Mark III||..||..||..||..||..||Feb 2007||4,499|
|11.||Canon 1Ds Mark III||..||..||+ +||4.5/5||..||Aug 2007||7,999|
|12.||Canon 1D Mark II N||..||..||..||..||..||Aug 2005||3,999|
|13.||Canon 5D||..||88/100||+ +||o||..||Aug 2005||3,299|
|14.||Canon 1D Mark II||..||..||+ +||..||..||Jan 2004||4,499|
|15.||Canon 1Ds Mark II||..||..||+ +||..||..||Sep 2004||7,999|
|16.||Leica Q2||..||..||84/100||4.5/5||4/5||Mar 2019||4,995|
|17.||Sony RX100 IV||4.5/5||+ +||85/100||4/5||4.5/5||Jun 2015||999|
|Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.|
Care should be taken when interpreting the review scores above, though. The ratings are only valid when referring to cameras in the same category and of the same age. Hence, a score should always be seen in the context of the camera's market launch date and its price, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.
Other camera comparisons
Did this review help to inform your camera decision process? If you would like to see a different side-by-side camera review, just make a corresponding selection in the search boxes below. As an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool.
Specifications: Canon 1Ds vs Leica Q Typ 116
Below is a side-by-side comparison of the specs of the two cameras to facilitate a quick review of their differences and common features.
|Camera Model||Canon 1Ds||Leica Q Typ 116|
|Camera Type||Digital single lens reflex||Fixed lens compact camera|
|Camera Lens||Canon EF mount lenses||28mm f/1.7|
|Launch Date||September 2002||June 2015|
|Launch Price||USD 8,999||USD 4,249|
|Sensor Specs||Canon 1Ds||Leica Q Typ 116|
|Sensor Format||Full Frame Sensor||Full Frame Sensor|
|Sensor Size||36.0 x 23.8 mm||36.0 x 24.0 mm|
|Sensor Area||856.8 mm2||864 mm2|
|Sensor Diagonal||43.2 mm||43.3 mm|
|Sensor Resolution||11 Megapixels||24 Megapixels|
|Image Resolution||4064 x 2704 pixels||6000 x 4000 pixels|
|Pixel Pitch||8.83 μm||6.00 μm|
|Pixel Density||1.28 MP/cm2||2.78 MP/cm2|
|Moiré control||Anti-Alias filter||Anti-Alias filter|
|Movie Capability||no Video||1080/60p Video|
|ISO Setting||100 - 1,250 ISO||100 - 50,000 ISO|
|ISO Boost||50 - 1,250 ISO||no Enhancement|
|Image Processor||DIGIC||Maestro II|
|DXO Sensor Quality (score)||63||85|
|DXO Color Depth (bits)||21.8||24.3|
|DXO Dynamic Range (EV)||11.0||12.7|
|DXO Low Light (ISO)||954||2221|
|Screen Specs||Canon 1Ds||Leica Q Typ 116|
|Viewfinder Type||Optical viewfinder||Electronic viewfinder|
|Viewfinder Field of View||100%||100%|
|Viewfinder Resolution||3680k dots|
|Top-Level Screen||Control Panel||no Top Display|
|LCD Framing||Live View|
|Rear LCD Size||2.0inch||3.0inch|
|LCD Resolution||120k dots||1040k dots|
|LCD Attachment||Fixed screen||Fixed screen|
|Touch Input||no Touchscreen||Touchscreen|
|Shooting Specs||Canon 1Ds||Leica Q Typ 116|
|Focus System||Phase-detect AF||Contrast-detect AF|
|Manual Focusing Aid||no Peaking Feature||Focus Peaking|
|Max Shutter Speed (mechanical)||1/8000s||1/2000s|
|Continuous Shooting||3 shutter flaps/s||10 shutter flaps/s|
|Electronic Shutter||no E-Shutter||up to 1/16000s|
|Time-Lapse Photography||no Intervalometer||Intervalometer built-in|
|Fill Flash||no On-Board Flash||no On-Board Flash|
|Storage Medium||CF cards||SDXC cards|
|Second Storage Option||Single card slot||Single card slot|
|Connectivity Specs||Canon 1Ds||Leica Q Typ 116|
|Studio Flash||PC Sync socket||no PC Sync|
|USB Connector||Firewire||USB 2.0|
|HDMI Port||no HDMI||micro HDMI|
|Wifi Support||no Wifi||Wifi built-in|
|Near-Field Communication||no NFC||NFC built-in|
|Body Specs||Canon 1Ds||Leica Q Typ 116|
|Environmental Sealing||Weathersealed body||not weather sealed|
|Battery Life (CIPA)||600 shots per charge||300 shots per charge|
156 x 158 x 80 mm
(6.1 x 6.2 x 3.1 in)
130 x 80 x 93 mm
(5.1 x 3.1 x 3.7 in)
|Camera Weight||1265 g (44.6 oz)||640 g (22.6 oz)|
Did you notice an error on this page? If so, please get in touch, so that we can correct the information.