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Nikon D90 vs Pentax K-30

The Nikon D90 and the Pentax K-30 are two digital cameras that were officially introduced, respectively, in August 2008 and May 2012. Both are DSLR (Digital Single Lens Reflex) cameras that are equipped with an APS-C sensor. The Nikon has a resolution of 12.2 megapixels, whereas the Pentax provides 16.1 MP.

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

Headline Specifications
Nikon D90
versus
Pentax K-30
Nikon D90   Pentax K-30
Digital single lens reflex Digital single lens reflex
Nikon F mount lenses Pentax K mount lenses
12.2 MP – APS-C sensor 16.1 MP – APS-C sensor
720/24p Video 1080/30p Video
ISO 200-3,200 (200 - 6,400) ISO 100-12,800 (100 - 25,600)
Optical viewfinder Optical viewfinder
3.0" LCD – 920k dots 3.0" LCD – 921k dots
Fixed screen (not touch-sensitive) Fixed screen (not touch-sensitive)
4.5 shutter flaps per second 6 shutter flaps per second
Lens stabilization onlyIn-body stabilization
not weather sealedWeathersealed body
850 shots per battery charge410 shots per battery charge
132 x 103 x 77 mm, 703 g 130 x 97 x 71 mm, 650 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Nikon D90 and the Pentax K-30? 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 physical size and weight of the Nikon D90 and the Pentax K-30 are illustrated 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 K-30 can be obtained in seven different colors (black, silver, blue, red, yellow, green, white), while the D90 is only available in black.

Size Nikon D90 vs Pentax K-30
Compare D90 versus K-30 top
Comparison D90 or K-30 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax K-30 is notably smaller (7 percent) than the Nikon D90. Moreover, the K-30 is markedly lighter (8 percent) than the D90. It is noteworthy in this context that the K-30 is splash and dust-proof, while the D90 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 D90 gets 850 shots out of its EN-EL3e battery, while the K-30 can take 410 images on a single charge of its D-LI109 power pack.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. If you would like to visualize and compare a different camera combination, you can navigate to the CAM-parator app and make your selection from a broad list of cameras there.

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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 D90 132 mm 103 mm 77 mm 703 g 850 n Aug 2008 1,299ebay.com
2.
 
Pentax K-30 130 mm 97 mm 71 mm 650 g 410 Y May 2012 849ebay.com
3.
 
Canon 40D 146 mm 108 mm 74 mm 822 g 750 n Aug 2007 1,299ebay.com
4.
 
Nikon D7000 132 mm 105 mm 77 mm 780 g 1050 Y Sep 2010 1,499ebay.com
5.
 
Nikon D3100 124 mm 96 mm 75 mm 505 g 550 n Aug 2010 599ebay.com
6.
 
Nikon D300S 147 mm 115 mm 81 mm 938 g 950 Y Jul 2009 1,799ebay.com
7.
 
Nikon D3000 126 mm 97 mm 64 mm 536 g 500 n Jul 2009 599ebay.com
8.
 
Nikon D5000 127 mm 104 mm 80 mm 590 g 510 n Apr 2009 749ebay.com
9.
 
Nikon D60 126 mm 94 mm 64 mm 522 g 500 n Jan 2008 629ebay.com
10.
 
Nikon D40X 124 mm 94 mm 64 mm 522 g 520 n Mar 2007 729ebay.com
11.
 
Nikon D300 147 mm 114 mm 74 mm 925 g 1000 Y Aug 2007 1,799ebay.com
12.
 
Nikon D80 132 mm 103 mm 77 mm 668 g 600 n Aug 2006 999ebay.com
13.
 
Pentax K-50 130 mm 97 mm 71 mm 650 g 410 Y Jun 2013 599ebay.com
14.
 
Pentax K-500 130 mm 97 mm 71 mm 646 g 710 n Jun 2013 549ebay.com
15.
 
Pentax K-3 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 1,299ebay.com
16.
 
Pentax K-5 II 131 mm 97 mm 73 mm 760 g 740 Y Sep 2012 1,099ebay.com
17.
 
Pentax K-5 131 mm 97 mm 73 mm 760 g 740 Y Sep 2010 1,099ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

Any camera decision will obviously take relative prices into account. 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 K-30 was launched at a markedly lower price (by 35 percent) than the D90, which puts it into a different 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 imaging sensor is at the core of digital cameras and its size is one of the main determining factors 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. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its background. On the downside, larger sensors tend to be associated with larger, more expensive camera bodies and lenses.

Both cameras under consideration feature an APS-C sensor, but their sensors differ slightly in size. The sensor area in the K-30 is 1 percent smaller. They nevertheless have the same format factor of 1.5. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Nikon D90 and Pentax K-30 sensor measures

Despite having a slightly smaller sensor, the K-30 offers a higher resolution of 16.1 megapixels, compared with 12.2 MP of the D90. This megapixels advantage comes at the cost of a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 4.79μm versus 5.53μm for the D90). However, it should be noted that the K-30 is much more recent (by 3 years and 8 months) than the D90, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently.

The resolution advantage of the Pentax K-30 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the K-30 for good quality output (200 dots per inch) amounts to 24.6 x 16.3 inches or 62.6 x 41.5 cm, for very good quality (250 dpi) 19.7 x 13.1 inches or 50.1 x 33.2 cm, and for excellent quality (300 dpi) 16.4 x 10.9 inches or 41.7 x 27.6 cm. The corresponding values for the Nikon D90 are 21.4 x 14.2 inches or 54.5 x 36.2 cm for good quality, 17.2 x 11.4 inches or 43.6 x 28.9 cm for very good quality, and 14.3 x 9.5 inches or 36.3 x 24.1 cm for excellent quality prints.

The Nikon D90 has a native sensitivity range from ISO 200 to ISO 3200, which can be extended to ISO 200-6400. The corresponding ISO settings for the Pentax K-30 are ISO 100 to ISO 12800, with the possibility to increase the ISO range to 100-25600.

Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

D90 versus K-30 MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. 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 K-30 has a markedly higher DXO score than the D90 (overall score 6 points higher), which will translate into better image quality. The advantage is based on 1 bits higher color depth, 0.5 EV in additional dynamic range, and 0.2 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.

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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 D90 APS-C 12.2 4288 2848720/24p22.712.597773
2.
 
Pentax K-30 APS-C 16.1 4928 32641080/30p23.713.0112979
3.
 
Canon 40D APS-C 10.1 3888 2592none22.111.370364
4.
 
Nikon D7000 APS-C 16.1 4928 32641080/24p23.513.9116780
5.
 
Nikon D3100 APS-C 14.2 4608 30721080/24p22.511.391967
6.
 
Nikon D300S APS-C 12.2 4288 2848720/24p22.512.278770
7.
 
Nikon D3000 APS-C 10.0 3872 2592none22.311.156362
8.
 
Nikon D5000 APS-C 12.2 4288 2848720/24p22.712.586872
9.
 
Nikon D60 APS-C 10.0 3872 2592none22.511.456265
10.
 
Nikon D40X APS-C 10.0 3872 2592none22.411.451663
11.
 
Nikon D300 APS-C 12.2 4288 2848none22.112.067967
12.
 
Nikon D80 APS-C 10.0 3872 2592none22.111.252461
13.
 
Pentax K-50 APS-C 16.1 4928 32641080/30p23.713.0112079
14.
 
Pentax K-500 APS-C 16.1 4928 32641080/30p23.713.1108779
15.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.4121680
16.
 
Pentax K-5 II APS-C 16.1 4928 32641080/25p23.814.1123582
17.
 
Pentax K-5 APS-C 16.1 4928 32641080/25p23.714.1116282

Many modern cameras are not only capable of taking still images, but can also record movies. Both cameras under consideration are equipped with sensors that have a sufficiently high read-out speed for moving images, but the K-30 provides a better video resolution than the D90. It can shoot movie footage at 1080/30p, while the Nikon is limited to 720/24p.

Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. The D90 and the K-30 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 K-30 offers a wider field of view (100%) than the one in the D90 (96%), so that a larger proportion of the captured image is visible in the finder. On the other hand, the viewfinder of the D90 has a higher magnification (0.63x vs 0.61x), 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 D90 and Pentax K-30 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 D90optical Y3.0 / 920 fixed n 1/4000s 4.5/s Y n
2.
 
Pentax K-30optical n3.0 / 921 fixed n 1/6000s 6.0/s Y Y
3.
 
Canon 40Doptical Y3.0 / 230 fixed n 1/8000s 6.5/s Y n
4.
 
Nikon D7000optical Y3.0 / 921 fixed n 1/8000s 6.0/s Y n
5.
 
Nikon D3100optical n3.0 / 230 fixed n 1/4000s 3.0/s Y n
6.
 
Nikon D300Soptical Y3.0 / 920 fixed n 1/8000s 7.0/s Y n
7.
 
Nikon D3000optical n3.0 / 230 fixed n 1/4000s 3.0/s Y n
8.
 
Nikon D5000optical n2.7 / 230 full-flex n 1/4000s 4.0/s Y n
9.
 
Nikon D60optical n2.5 / 230 fixed n 1/4000s 3.0/s Y n
10.
 
Nikon D40Xoptical n2.5 / 230 fixed n 1/4000s 3.0/s Y n
11.
 
Nikon D300optical Y3.0 / 922 fixed n 1/8000s 6.0/s Y n
12.
 
Nikon D80optical n2.5 / 230 fixed n 1/4000s 3.0/s Y n
13.
 
Pentax K-50optical n3.0 / 921 fixed n 1/6000s 6.0/s Y Y
14.
 
Pentax K-500optical n3.0 / 921 fixed n 1/6000s 6.0/s Y Y
15.
 
Pentax K-3optical Y3.2 / 1037 fixed n 1/8000s 8.3/s Y Y
16.
 
Pentax K-5 IIoptical Y3.0 / 921 fixed n 1/8000s 7.0/s Y Y
17.
 
Pentax K-5optical Y3.0 / 921 fixed n 1/8000s 7.0/s Y Y
Notes: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One feature that is present on the D90, but is missing on the K-30 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 D90 writes its imaging data to SDHC cards, while the K-30 uses SDXC cards.

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 D90 and Pentax K-30 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 D90Ymono / mono--mini2.0---
2.
 
Pentax K-30Ymono / mono---2.0---
3.
 
Canon 40DY- / ----2.0---
4.
 
Nikon D7000Ymono / monoY-mini2.0---
5.
 
Nikon D3100Ymono / mono--mini2.0---
6.
 
Nikon D300SYstereo / monoY-mini2.0---
7.
 
Nikon D3000Y- / ----2.0---
8.
 
Nikon D5000Ymono / mono--mini2.0---
9.
 
Nikon D60Y- / ----2.0---
10.
 
Nikon D40XY- / ----2.0---
11.
 
Nikon D300Y- / ---mini2.0---
12.
 
Nikon D80Y- / ----2.0---
13.
 
Pentax K-50Ymono / mono--micro2.0---
14.
 
Pentax K-500Ymono / mono---2.0---
15.
 
Pentax K-3Ymono / monoYYmini3.0---
16.
 
Pentax K-5 IIYstereo / monoY-mini2.0---
17.
 
Pentax K-5Ystereo / monoY-mini2.0---

Both the D90 and the K-30 have been discontinued, but can regularly be found used on ebay. The D90 was replaced by the Nikon D7000, while the K-30 was followed by the Pentax K-50. Further information on the features and operation of the D90 and K-30 can be found, respectively, in the Nikon D90 Manual (free pdf) or the online Pentax K-30 Manual.

Review summary

So how do things add up? Which of the two cameras – the Nikon D90 or the Pentax K-30 – has the upper hand? Is one clearly better than the other? The listing below highlights the relative strengths of the two models.

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Arguments in favor of the Nikon D90:

  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.63x vs 0.61x).
  • Easier setting verification: Features an LCD display on top to control shooting parameters.
  • Longer lasting: Can take more shots (850 versus 410) on a single battery charge.
  • More heavily discounted: Has been available for much longer (launched in August 2008).

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Advantages of the Pentax K-30:

  • More detail: Has more megapixels (16.1 vs 12.2MP), which boosts linear resolution by 15%.
  • Better image quality: Scores markedly higher (6 points) in the DXO overall evaluation.
  • Better video: Provides higher definition movie capture (1080/30p vs 720/24p).
  • More complete view: Has a viewfinder with a larger field of view (100% vs 96%).
  • Faster shutter: Has higher mechanical shutter speed (1/6000s vs 1/4000s) to freeze action.
  • Faster burst: Shoots at higher frequency (6 vs 4.5 flaps/sec) to capture the decisive moment.
  • 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.
  • More affordable: Was introduced into a lower priced category (35 percent cheaper at launch).
  • More modern: Reflects 3 years and 8 months of technical progress since the D90 launch.

If the number of relative strengths (bullet points above) is taken as a guide, the K-30 is the clear winner of the contest (10 : 4 points). However, the relevance of individual strengths will vary across photographers, so that you might want to apply your own weighing scheme to the summary points when reflecting and deciding 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.

D90 04:10 K-30

How about other alternatives? Do the specifications of the Nikon D90 and the Pentax K-30 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 comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the D90 or the K-30. At times, user reviews, such as those published at amazon, address these issues in a useful manner, but such feedback is on many occasions incomplete, inconsistent, and unreliable.

Expert reviews

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], 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 D90..+ +..+ +4/54.5/5 Aug 2008 1,299ebay.com
2.
 
Pentax K-304/5....78/1004.5/54.5/5 May 2012 849ebay.com
3.
 
Canon 40D..+ +..+ +4.5/54.5/5 Aug 2007 1,299ebay.com
4.
 
Nikon D70004/5....80/1004.5/54.5/5 Sep 2010 1,499ebay.com
5.
 
Nikon D31005/5+ +..72/1004.5/54.5/5 Aug 2010 599ebay.com
6.
 
Nikon D300S5/5+ +..82/1004/54.5/5 Jul 2009 1,799ebay.com
7.
 
Nikon D3000..+..72/1004/54.5/5 Jul 2009 599ebay.com
8.
 
Nikon D5000..+ +..75/1004/54.5/5 Apr 2009 749ebay.com
9.
 
Nikon D60..80/100..+ +4/54.5/5 Jan 2008 629ebay.com
10.
 
Nikon D40X..79/100..+ +4/54/5 Mar 2007 729ebay.com
11.
 
Nikon D300..+ +..+ +5/54.5/5 Aug 2007 1,799ebay.com
12.
 
Nikon D80..+..+ +o4.5/5 Aug 2006 999ebay.com
13.
 
Pentax K-505/5......5/54.5/5 Jun 2013 599ebay.com
14.
 
Pentax K-500........4.5/54.5/5 Jun 2013 549ebay.com
15.
 
Pentax K-34/5....83/1005/55/5 Oct 2013 1,299ebay.com
16.
 
Pentax K-5 II5/5....80/1005/54.5/5 Sep 2012 1,099ebay.com
17.
 
Pentax K-54/5....83/1005/54.5/5 Sep 2010 1,099ebay.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. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and comparisons of ratings among very different cameras or across long time periods have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.

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Other camera comparisons

Did this review help to inform your camera decision process? In case you would like to check on the differences and similarities of other camera models, just use the search menu below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications: Nikon D90 vs Pentax K-30

    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 D90 Pentax K-30
    Camera Type Digital single lens reflex Digital single lens reflex
    Camera Lens Nikon F mount lenses Pentax K mount lenses
    Launch Date August 2008 May 2012
    Launch Price USD 1,299 USD 849
    Sensor Specs Nikon D90 Pentax K-30
    Sensor Technology CMOS CMOS
    Sensor Format APS-C Sensor APS-C Sensor
    Sensor Size 23.6 x 15.8 mm 23.7 x 15.6 mm
    Sensor Area 372.88 mm2 369.72 mm2
    Sensor Diagonal 28.4 mm 28.4 mm
    Crop Factor 1.5x 1.5x
    Sensor Resolution 12.2 Megapixels 16.1 Megapixels
    Image Resolution 4288 x 2848 pixels 4928 x 3264 pixels
    Pixel Pitch 5.53 μm 4.79 μm
    Pixel Density 3.28 MP/cm2 4.35 MP/cm2
    Moiré control Anti-Alias filter Anti-Alias filter
    Movie Capability 720/24p Video 1080/30p Video
    ISO Setting 200 - 3,200 ISO 100 - 12,800 ISO
    ISO Boost 200 - 6,400 ISO 100 - 25,600 ISO
    Image Processor EXPEED PRIME M
    DXO Sensor Quality (score) 73 79
    DXO Color Depth (bits) 22.7 23.7
    DXO Dynamic Range (EV) 12.5 13.0
    DXO Low Light (ISO) 977 1129
    Screen Specs Nikon D90 Pentax K-30
    Viewfinder Type Optical viewfinder Optical viewfinder
    Viewfinder Field of View 96% 100%
    Viewfinder Magnification 0.63x 0.61x
    Top-Level Screen Control Panel no Top Display
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 920k dots 921k dots
    LCD Attachment Fixed screen Fixed screen
    Shooting Specs Nikon D90 Pentax K-30
    Focus System Phase-detect AF Phase-detect AF
    Manual Focusing Aidno Peaking FeatureFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/6000s
    Continuous Shooting 4.5 shutter flaps/s 6 shutter flaps/s
    Image StabilizationLens stabilization onlyIn-body stabilization
    Fill Flash Built-in Flash Built-in Flash
    Storage Medium SDHC cards SDXC cards
    Single or Dual Card Slots Single card slot Single card slot
    UHS card support no no
    Connectivity Specs Nikon D90 Pentax K-30
    External Flash Hotshoe Hotshoe
    USB Connector USB 2.0 USB 2.0
    HDMI Port mini HDMI no HDMI
    Wifi Support no Wifi no Wifi
    Body Specs Nikon D90 Pentax K-30
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type EN-EL3e D-LI109
    Battery Life (CIPA)850 shots per charge410 shots per charge
    Body Dimensions 132 x 103 x 77 mm
    (5.2 x 4.1 x 3.0 in)
    130 x 97 x 71 mm
    (5.1 x 3.8 x 2.8 in)
    Camera Weight 703 g (24.8 oz) 650 g (22.9 oz)
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