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Nikon D100 vs Sony A850

The Nikon D100 and the Sony Alpha A850 are two digital cameras that were announced, respectively, in February 2002 and August 2009. Both are DSLR (Digital Single Lens Reflex) cameras that are based on an APS-C (D100) and a full frame (A850) sensor. The Nikon has a resolution of 6 megapixels, whereas the Sony provides 24.4 MP.

Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Headline Specifications
Nikon D100
versus
Sony A850
Nikon D100   Sony A850
Digital single lens reflex Digital single lens reflex
Nikon F mount lenses Sony A mount lenses
6 MP – APS-C sensor 24.4 MP – Full Frame sensor
no Video no Video
ISO 200-800 (200 - 1,600) ISO 200-3,200 (100 - 6,400)
Optical viewfinder Optical viewfinder
1.8" LCD – 118k dots 3.0" LCD – 922k dots
Fixed screen (not touch-sensitive) Fixed screen (not touch-sensitive)
3 shutter flaps per second 3 shutter flaps per second
Lens stabilization onlyIn-body stabilization
not weather sealedWeathersealed body
370 shots per battery charge880 shots per battery charge
144 x 116 x 81 mm, 780 g 156 x 117 x 82 mm, 895 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Nikon D100 and the Sony Alpha A850? 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.

Body comparison

The side-by-side display below illustrates the physical size and weight of the Nikon D100 and the Sony A850. The two cameras are presented according to their relative size. Three successive views from the front, the top, and the rear are shown. All width, height and depth dimensions are rounded to the nearest millimeter.

Size Nikon D100 vs Sony A850
Compare D100 versus A850 top
Comparison D100 or A850 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A850 is notably larger (9 percent) than the Nikon D100. Moreover, the A850 is markedly heavier (15 percent) than the D100. It is noteworthy in this context that the A850 is splash and dust-proof, while the D100 does not feature any corresponding weather-sealing.

The above size and weight comparisons are to some extent incomplete since they do not consider the interchangeable lenses that both of these cameras require. Hence, you might want to study and compare the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.

Concerning battery life, the D100 gets 370 shots out of its EN-EL3 battery, while the A850 can take 880 images on a single charge of its NP-FM500H power pack.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. In case you want to display and compare another camera duo, you can use the CAM-parator app to select your camera combination among a large number of options.

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Body Specifications
    Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Nikon D100 144 mm 116 mm 81 mm 780 g 370 n Feb 2002 1,999ebay.com
2.
 
Sony A850 156 mm 117 mm 82 mm 895 g 880 Y Aug 2009 1,999ebay.com
3.
 
Canon 10D 150 mm 107 mm 75 mm 850 g 500 n Feb 2003 1,999ebay.com
4.
 
Nikon D750 141 mm 113 mm 78 mm 750 g 1230 Y Sep 2014 2,299ebay.com
5.
 
Nikon D90 132 mm 103 mm 77 mm 703 g 850 n Aug 2008 1,299ebay.com
6.
 
Nikon D300 147 mm 114 mm 74 mm 925 g 1000 Y Aug 2007 1,799ebay.com
7.
 
Nikon D40 124 mm 94 mm 64 mm 522 g 470 n Nov 2006 499ebay.com
8.
 
Nikon D80 132 mm 103 mm 77 mm 668 g 600 n Aug 2006 999ebay.com
9.
 
Nikon D50 133 mm 102 mm 76 mm 620 g 400 n Apr 2005 749ebay.com
10.
 
Nikon D70s 140 mm 111 mm 78 mm 679 g 500 n Apr 2005 899ebay.com
11.
 
Nikon D200 147 mm 113 mm 74 mm 920 g 400 Y Nov 2005 1,699ebay.com
12.
 
Nikon D70 140 mm 111 mm 78 mm 679 g 400 n Jan 2004 999ebay.com
13.
 
Nikon D1X 157 mm 153 mm 85 mm 1100 g 1200 Y Feb 2001 5,999ebay.com
14.
 
Sony A7C 124 mm 71 mm 60 mm 509 g 740 Y Sep 2020 1,799 amazon.com
15.
 
Sony A7 III 127 mm 96 mm 74 mm 650 g 610 Y Feb 2018 1,999 amazon.com
16.
 
Sony A99 147 mm 111 mm 78 mm 812 g 500 Y Sep 2012 2,799ebay.com
17.
 
Sony A900 156 mm 117 mm 82 mm 895 g 880 Y Sep 2008 2,999ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

The price is, of course, an important factor in any camera decision. 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 two cameras under review were launched at the same price and fall into the same market segment. 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.

Sensor comparison

The size of the imaging sensor is a crucial determinant of image quality. A large sensor will generally have larger individual pixels that offer better low-light sensitivity, provide wider dynamic range, and have richer color-depth than smaller pixels 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 associated with larger, more expensive camera bodies and lenses.

Of the two cameras under consideration, the Nikon D100 features an APS-C sensor and the Sony A850 a full frame sensor. The sensor area in the A850 is 133 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.5 and 1.0. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Nikon D100 and Sony A850 sensor measures

With 24.4MP, the A850 offers a higher resolution than the D100 (6MP), but the A850 has smaller individual pixels (pixel pitch of 5.94μm versus 7.85μm for the D100). Yet, the A850 is a much more recent model (by 7 years and 6 months) than the D100, 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 Sony A850 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A850 for good quality output (200 dots per inch) amounts to 30.2 x 20.2 inches or 76.8 x 51.2 cm, for very good quality (250 dpi) 24.2 x 16.1 inches or 61.4 x 41 cm, and for excellent quality (300 dpi) 20.2 x 13.4 inches or 51.2 x 34.1 cm. The corresponding values for the Nikon D100 are 15 x 10 inches or 38.2 x 25.4 cm for good quality, 12 x 8 inches or 30.6 x 20.3 cm for very good quality, and 10 x 6.7 inches or 25.5 x 16.9 cm for excellent quality prints.

The Nikon D100 has a native sensitivity range from ISO 200 to ISO 800, which can be extended to ISO 200-1600. The corresponding ISO settings for the Sony Alpha A850 are ISO 200 to ISO 3200, with the possibility to increase the ISO range to 100-6400.

In terms of underlying technology, the D100 is build around a CCD sensor, while the A850 uses a CMOS imager. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

D100 versus A850 MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. This service determines an overall sensor rating, as well as sub-scores for low-light sensitivity ("DXO Sports"), dynamic range ("DXO Landscape"), and color depth ("DXO Portrait"). The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.

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Sensor Characteristics
    Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Nikon D100 APS-C 6.0 3008 2000none20.49.939448
2.
 
Sony A850 Full Frame 24.4 6048 4032none23.812.2141579
3.
 
Canon 10D APS-C 6.3 3072 2048none21.110.957157
4.
 
Nikon D750 Full Frame 24.2 6016 40161080/60p24.814.5295693
5.
 
Nikon D90 APS-C 12.2 4288 2848720/24p22.712.597773
6.
 
Nikon D300 APS-C 12.2 4288 2848none22.112.067967
7.
 
Nikon D40 APS-C 6.0 3008 2000none21.011.056156
8.
 
Nikon D80 APS-C 10.0 3872 2592none22.111.252461
9.
 
Nikon D50 APS-C 6.0 3008 2000none20.910.856055
10.
 
Nikon D70s APS-C 6.0 3008 2000none20.410.352950
11.
 
Nikon D200 APS-C 10.0 3872 2592none22.311.558364
12.
 
Nikon D70 APS-C 6.0 3008 2000none20.410.352950
13.
 
Nikon D1X APS-C 5.9 3008 1960none........
14.
 
Sony A7C Full Frame 24.0 6000 40004K/30p25.014.7340795
15.
 
Sony A7 III Full Frame 24.0 6000 40004K/30p25.014.7373096
16.
 
Sony A99 Full Frame 24.0 6000 40001080/60p25.014.0155589
17.
 
Sony A900 Full Frame 24.4 6048 4032none23.712.3143179
Note: DXO values in italics represent estimates based on sensor size and age.
Neither the D100 nor the A850 offer Live View, so that they cannot project the live image that the sensor receives onto the rear screen. Moreover, both cameras are still-image focused and cannot record videos.

Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. The D100 and the A850 are similar in the sense that both have an optical viewfinder. The latter is useful for getting a clear image for framing even in brightly lit environments. The viewfinder in the A850 offers a wider field of view (98%) than the one in the D100 (95%), so that a larger proportion of the captured image is visible in the finder. In addition, the viewfinder of the A850 has a higher magnification (0.74x vs 0.53x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The adjacent table lists some of the other core features of the Nikon D100 and Sony A850 along with similar information for a selection of comparators.

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Core Features
    Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Specifications
(inch/000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Max
Shutter
Speed *
Max
Shutter
Flaps *
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Nikon D100optical Y1.8 / 118 fixed n 1/4000s 3.0/s Y n
2.
 
Sony A850optical Y3.0 / 922 fixed n 1/8000s 3.0/s n Y
3.
 
Canon 10Doptical Y1.8 / 118 fixed n 1/4000s 3.0/s Y n
4.
 
Nikon D750optical Y3.2 / 1229 tilting n 1/4000s 6.0/s Y n
5.
 
Nikon D90optical Y3.0 / 920 fixed n 1/4000s 4.5/s Y n
6.
 
Nikon D300optical Y3.0 / 922 fixed n 1/8000s 6.0/s Y n
7.
 
Nikon D40optical n2.5 / 230 fixed n 1/4000s 2.5/s Y n
8.
 
Nikon D80optical n2.5 / 230 fixed n 1/4000s 3.0/s Y n
9.
 
Nikon D50optical n2.0 / 130 fixed n 1/4000s 2.5/s Y n
10.
 
Nikon D70soptical n2.0 / 130 fixed n 1/8000s 3.0/s Y n
11.
 
Nikon D200optical Y2.5 / 230 fixed n 1/8000s 5.0/s Y n
12.
 
Nikon D70optical n1.8 / 130 fixed n 1/8000s 3.0/s Y n
13.
 
Nikon D1Xoptical Y2.0 / 120 fixed n 1/16000s 3.0/s n n
14.
 
Sony A7C2360 n3.0 / 922 swivel Y 1/4000s 10.0/s n Y
15.
 
Sony A7 III2359 n3.0 / 922 tilting Y 1/8000s 10.0/s n Y
16.
 
Sony A992359 Y3.0 / 1229 full-flex n 1/8000s 6.0/s n Y
17.
 
Sony A900optical Y3.0 / 922 fixed n 1/8000s 5.0/s n Y
Notes: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One difference between the cameras concerns the presence of an on-board flash. The D100 has one, while the A850 does not. While the built-in flash of the D100 is not very powerful, it can at times be useful as a fill-in light.

The D100 writes its imaging data to Compact Flash cards, while the A850 uses Compact Flash or Memory Stick PRO Duo cards. The A850 features dual card slots, which can be very useful in case a memory card fails. In contrast, the D100 only has one slot.

Connectivity comparison

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 Nikon D100 and Sony Alpha A850 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
    Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Nikon D100Y- / ----1.1---
2.
 
Sony A850Y- / ---mini2.0---
3.
 
Canon 10DY- / ----1.1---
4.
 
Nikon D750Ystereo / monoYYmini2.0Y--
5.
 
Nikon D90Ymono / mono--mini2.0---
6.
 
Nikon D300Y- / ---mini2.0---
7.
 
Nikon D40Y- / ----2.0---
8.
 
Nikon D80Y- / ----2.0---
9.
 
Nikon D50Y- / ----2.0---
10.
 
Nikon D70sY- / ----2.0---
11.
 
Nikon D200Y- / ----2.0---
12.
 
Nikon D70Y- / ----1.0---
13.
 
Nikon D1XY- / ----FW---
14.
 
Sony A7CYstereo / monoYYmicro3.2YYY
15.
 
Sony A7 IIIYstereo / monoYYmicro3.1YYY
16.
 
Sony A99Ystereo / monoYYmini2.0---
17.
 
Sony A900Y- / ---mini2.0---

Studio photographers will appreciate that the Sony A850 (unlike the D100) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the D100 and the A850 have been discontinued, but can regularly be found used on ebay. The D100 was replaced by the Nikon D200, while the A850 does not have a direct successor. Further information on the features and operation of the D100 and A850 can be found, respectively, in the Nikon D100 Manual (free pdf) or the online Sony A850 Manual.

Review summary

So how do things add up? Which of the two cameras – the Nikon D100 or the Sony A850 – 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.

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Arguments in favor of the Nikon D100:

  • Less heavy: Is lighter (by 115g or 13 percent) and hence easier to carry around.
  • Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
  • More heavily discounted: Has been available for much longer (launched in February 2002).

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Advantages of the Sony Alpha A850:

  • More detail: Has more megapixels (24.4 vs 6MP), which boosts linear resolution by 101%.
  • Better image quality: Is equipped with a larger and more technologically advanced sensor.
  • Richer colors: The sensor size advantage translates into images with better, more accurate colors.
  • More dynamic range: Larger sensor captures a wider spectrum of light and dark details.
  • Better low-light sensitivity: Larger sensor produces good images even in poorly lit environments.
  • More complete view: Has a viewfinder with a larger field of view (98% vs 95%).
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.74x vs 0.53x).
  • Larger screen: Has a bigger rear LCD (3.0" vs 1.8") for image review and settings control.
  • More detailed LCD: Has a higher resolution rear screen (922k vs 118k dots).
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Longer lasting: Gets more shots (880 versus 370) out of a single battery charge.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
  • Faster data transfer: Supports a more advanced USB protocol (2.0 vs 1.1).
  • Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
  • Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
  • More modern: Reflects 7 years and 6 months of technical progress since the D100 launch.

If the count of individual advantages (bullet points above) is taken as a guide, the A850 is the clear winner of the contest (17 : 3 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 wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

D100 03:17 A850

How about other alternatives? Do the specifications of the Nikon D100 and the Sony A850 place the cameras among the top in their class? Find out in the latest Best DSLR Camera listing 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 says little about, for example, the shooting experience and imaging performance of the D100 and the A850 in practical situations. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.

Expert reviews

This is why expert reviews are important. The table below provides a synthesis of the camera assessments of some of the best known photo-gear review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], 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.

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Expert Camera Reviews
     Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Nikon D100......+ +o.. Feb 2002 1,999ebay.com
2.
 
Sony A8503/5....75/100..4.5/5 Aug 2009 1,999ebay.com
3.
 
Canon 10D......+ +.... Feb 2003 1,999ebay.com
4.
 
Nikon D7505/5+ +4/590/1004.5/54.5/5 Sep 2014 2,299ebay.com
5.
 
Nikon D90..+ +..+ +4/54.5/5 Aug 2008 1,299ebay.com
6.
 
Nikon D300..+ +..+ +5/54.5/5 Aug 2007 1,799ebay.com
7.
 
Nikon D40..81/100..+ +o4.5/5 Nov 2006 499ebay.com
8.
 
Nikon D80..+..+ +o4.5/5 Aug 2006 999ebay.com
9.
 
Nikon D50..78/100..+ +4/54.5/5 Apr 2005 749ebay.com
10.
 
Nikon D70s..........5/5 Apr 2005 899ebay.com
11.
 
Nikon D200..+ +..+ +o.. Nov 2005 1,699ebay.com
12.
 
Nikon D70......+ +.... Jan 2004 999ebay.com
13.
 
Nikon D1X......+ +.... Feb 2001 5,999ebay.com
14.
 
Sony A7C3.5/5..3.5/586/1004/54/5 Sep 2020 1,799 amazon.com
15.
 
Sony A7 III..+ +4.5/589/1005/55/5 Feb 2018 1,999 amazon.com
16.
 
Sony A995/5....84/1004.5/54.5/5 Sep 2012 2,799ebay.com
17.
 
Sony A900..+ +..+ +4.5/55/5 Sep 2008 2,999ebay.com
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The review scores listed above should be treated with care, though. The ratings are only valid when referring to cameras in the same category and of the same age. A score, therefore, has to be seen in close connection to the price and market introduction time of the camera, and comparisons of ratings among very different cameras or across long time periods have little meaning. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

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Other camera comparisons

Did this review help to inform your camera decision process? In case you are interested in seeing how other cameras pair up, just make your choice using the following search menu. As an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool.

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    Specifications: Nikon D100 vs Sony A850

    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 Specifications
    Camera Model Nikon D100 Sony A850
    Camera Type Digital single lens reflex Digital single lens reflex
    Camera Lens Nikon F mount lenses Sony A mount lenses
    Launch Date February 2002 August 2009
    Launch Price USD 1,999 USD 1,999
    Sensor Specs Nikon D100 Sony A850
    Sensor Technology CCD CMOS
    Sensor Format APS-C Sensor Full Frame Sensor
    Sensor Size 23.7 x 15.6 mm 35.9 x 24.0 mm
    Sensor Area 369.72 mm2 861.6 mm2
    Sensor Diagonal 28.4 mm 43.2 mm
    Crop Factor 1.5x 1.0x
    Sensor Resolution 6 Megapixels 24.4 Megapixels
    Image Resolution 3008 x 2000 pixels 6048 x 4032 pixels
    Pixel Pitch 7.85 μm 5.94 μm
    Pixel Density 1.63 MP/cm2 2.83 MP/cm2
    Moiré control Anti-Alias filter Anti-Alias filter
    Movie Capability no Video no Video
    ISO Setting 200 - 800 ISO 200 - 3,200 ISO
    ISO Boost 200 - 1,600 ISO 100 - 6,400 ISO
    DXO Sensor Quality (score) .. 79
    DXO Color Depth (bits) .. 23.8
    DXO Dynamic Range (EV) .. 12.2
    DXO Low Light (ISO) .. 1415
    Screen Specs Nikon D100 Sony A850
    Viewfinder Type Optical viewfinder Optical viewfinder
    Viewfinder Field of View 95% 98%
    Viewfinder Magnification 0.53x 0.74x
    Top-Level Screen Control Panel Control Panel
    Rear LCD Size 1.8inch 3.0inch
    LCD Resolution 118k dots 922k dots
    LCD Attachment Fixed screen Fixed screen
    Shooting Specs Nikon D100 Sony A850
    Focus System Phase-detect AF Phase-detect AF
    Continuous Shooting 3 shutter flaps/s 3 shutter flaps/s
    Image StabilizationLens stabilization onlyIn-body stabilization
    Fill Flash Built-in Flash no On-Board Flash
    Storage Medium CF cards CF or MS cards
    Second Storage Option Single card slot Dual card slots
    Connectivity Specs Nikon D100 Sony A850
    External Flash Hotshoe Hotshoe
    Studio Flash no PC Sync PC Sync socket
    USB Connector USB 1.1 USB 2.0
    HDMI Port no HDMI mini HDMI
    Wifi Support no Wifi no Wifi
    Body Specs Nikon D100 Sony A850
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type EN-EL3 NP-FM500H
    Battery Life (CIPA)370 shots per charge880 shots per charge
    Body Dimensions 144 x 116 x 81 mm
    (5.7 x 4.6 x 3.2 in)
    156 x 117 x 82 mm
    (6.1 x 4.6 x 3.2 in)
    Camera Weight 780 g (27.5 oz) 895 g (31.6 oz)
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