Pentax K-3 vs Pentax RZ18
59 Imaging
64 Features
85 Overall
72
92 Imaging
38 Features
37 Overall
37
Pentax K-3 vs Pentax RZ18 Key Specs
(Full Review)
- 24MP - APS-C Sensor
- 3.2" Fixed Display
- ISO 100 - 51200
- Sensor based Image Stabilization
- No Anti-Alias Filter
- 1/8000s Maximum Shutter
- 1920 x 1080 video
- Pentax KAF2 Mount
- 800g - 131 x 100 x 77mm
- Revealed April 2014
- Successor is Pentax K-3 II
(Full Review)
- 16MP - 1/2.3" Sensor
- 3" Fixed Display
- ISO 80 - 6400
- Sensor-shift Image Stabilization
- 1280 x 720 video
- 25-450mm (F3.5-5.9) lens
- 178g - 97 x 61 x 33mm
- Launched September 2011
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Its time to look much closer at the Pentax K-3 versus Pentax RZ18, former is a Advanced DSLR while the other is a Small Sensor Superzoom and both are designed by Pentax. There is a considerable difference among the resolutions of the K-3 (24MP) and RZ18 (16MP) and the K-3 (APS-C) and RZ18 (1/2.3") offer different sensor size.
President Biden pushes bill mandating TikTok sale or banThe K-3 was announced 2 years after the RZ18 which is a fairly large difference as far as camera tech is concerned. Both the cameras have different body design with the Pentax K-3 being a Mid-size SLR camera and the Pentax RZ18 being a Compact camera.
Before getting right into a step-by-step comparison, here is a concise introduction of how the K-3 scores vs the RZ18 with respect to portability, imaging, features and an overall score.
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This is a sample of the gallery pics for Pentax K-3 & Pentax Optio RZ18. The whole galleries are available at Pentax K-3 Gallery & Pentax RZ18 Gallery.
Reasons to pick Pentax K-3 over the Pentax RZ18
| K-3 | RZ18 | |||
|---|---|---|---|---|
| Launched | April 2014 | September 2011 | More modern by 32 months | |
| Display dimensions | 3.2" | 3" | Larger display (+0.2") | |
| Display resolution | 1037k | 460k | Clearer display (+577k dot) |
Reasons to pick Pentax RZ18 over the Pentax K-3
| RZ18 | K-3 |
|---|
Common features in the Pentax K-3 and Pentax RZ18
| K-3 | RZ18 | |||
|---|---|---|---|---|
| Manual focus | More precise focus | |||
| Display type | Fixed | Fixed | Fixed display | |
| Selfie screen | No selfie screen | |||
| Touch display | No Touch display |
Pentax K-3 vs Pentax RZ18 Physical Comparison
For anybody who is going to carry around your camera regularly, you will need to consider its weight and proportions. The Pentax K-3 has got external dimensions of 131mm x 100mm x 77mm (5.2" x 3.9" x 3.0") having a weight of 800 grams (1.76 lbs) and the Pentax RZ18 has measurements of 97mm x 61mm x 33mm (3.8" x 2.4" x 1.3") with a weight of 178 grams (0.39 lbs).
Examine the Pentax K-3 versus Pentax RZ18 in our completely new Camera & Lens Size Comparison Tool.
Take into account, the weight of an ILC will vary dependant on the lens you are employing at that time. Here is a front view dimension comparison of the K-3 compared to the RZ18.

Considering size and weight, the portability grade of the K-3 and RZ18 is 59 and 92 respectively.
Pentax K-3 vs Pentax RZ18 Sensor Comparison
Oftentimes, its hard to picture the difference in sensor sizes only by looking through specifications. The image underneath should give you a better sense of the sensor dimensions in the K-3 and RZ18.
Plainly, both of these cameras have different resolutions and different sensor sizes. The K-3 using its larger sensor is going to make achieving shallower depth of field easier and the Pentax K-3 will render greater detail with its extra 8MP. Greater resolution will allow you to crop photos a bit more aggressively. The younger K-3 should have an advantage with regard to sensor innovation.
Pentax K-3 vs Pentax RZ18 Screen and ViewFinder
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Pentax K-3 vs Pentax RZ18 Specifications
| Pentax K-3 | Pentax Optio RZ18 | |
|---|---|---|
| General Information | ||
| Brand | Pentax | Pentax |
| Model | Pentax K-3 | Pentax Optio RZ18 |
| Category | Advanced DSLR | Small Sensor Superzoom |
| Revealed | 2014-04-10 | 2011-09-12 |
| Physical type | Mid-size SLR | Compact |
| Sensor Information | ||
| Processor | Prime III | - |
| Sensor type | CMOS | CCD |
| Sensor size | APS-C | 1/2.3" |
| Sensor measurements | 23.5 x 15.6mm | 6.08 x 4.56mm |
| Sensor surface area | 366.6mm² | 27.7mm² |
| Sensor resolution | 24 megapixel | 16 megapixel |
| Anti aliasing filter | ||
| Aspect ratio | 3:2 | 1:1, 4:3 and 16:9 |
| Peak resolution | 6016 x 4000 | 4608 x 3456 |
| Highest native ISO | 51200 | 6400 |
| Lowest native ISO | 100 | 80 |
| RAW images | ||
| Autofocusing | ||
| Focus manually | ||
| Autofocus touch | ||
| Continuous autofocus | ||
| Autofocus single | ||
| Autofocus tracking | ||
| Autofocus selectice | ||
| Autofocus center weighted | ||
| Autofocus multi area | ||
| Live view autofocus | ||
| Face detect autofocus | ||
| Contract detect autofocus | ||
| Phase detect autofocus | ||
| Number of focus points | 27 | 9 |
| Cross focus points | 25 | - |
| Lens | ||
| Lens mount | Pentax KAF2 | fixed lens |
| Lens focal range | - | 25-450mm (18.0x) |
| Maximum aperture | - | f/3.5-5.9 |
| Macro focus range | - | 4cm |
| Available lenses | 151 | - |
| Focal length multiplier | 1.5 | 5.9 |
| Screen | ||
| Display type | Fixed Type | Fixed Type |
| Display size | 3.2" | 3" |
| Resolution of display | 1,037 thousand dots | 460 thousand dots |
| Selfie friendly | ||
| Liveview | ||
| Touch functionality | ||
| Display tech | TFT LCD monitor | TFT color LCD with Anti-reflective coating |
| Viewfinder Information | ||
| Viewfinder | Optical (pentaprism) | None |
| Viewfinder coverage | 100% | - |
| Viewfinder magnification | 0.64x | - |
| Features | ||
| Minimum shutter speed | 30s | 4s |
| Fastest shutter speed | 1/8000s | 1/2000s |
| Continuous shutter rate | 8.0 frames/s | 1.0 frames/s |
| Shutter priority | ||
| Aperture priority | ||
| Manual mode | ||
| Exposure compensation | Yes | - |
| Custom white balance | ||
| Image stabilization | ||
| Integrated flash | ||
| Flash range | 13.00 m (at ISO 100) | 2.80 m |
| Flash settings | Auto, on, off, red-eye, slow sync, slow sync + red-eye, trailing curtain sync, high speed, wireless, manual | Auto, On, Off, Red-eye, Soft |
| Hot shoe | ||
| AE bracketing | ||
| White balance bracketing | ||
| Fastest flash synchronize | 1/180s | - |
| Exposure | ||
| Multisegment metering | ||
| Average metering | ||
| Spot metering | ||
| Partial metering | ||
| AF area metering | ||
| Center weighted metering | ||
| Video features | ||
| Video resolutions | 1920 x 1080 (60i, 50i, 30p, 25p, 24p), 1280 x 720 (60p, 50p, 30p, 25p, 24p) | 1280 x 720 (30, 15 fps), 640 x 480 (30, 15 fps), 320 x 240 (30, 15 fps) |
| Highest video resolution | 1920x1080 | 1280x720 |
| Video data format | MPEG-4, H.264 | Motion JPEG |
| Microphone port | ||
| Headphone port | ||
| Connectivity | ||
| Wireless | None | Eye-Fi Connected |
| Bluetooth | ||
| NFC | ||
| HDMI | ||
| USB | USB 3.0 (5 GBit/sec) | USB 2.0 (480 Mbit/sec) |
| GPS | Optional | None |
| Physical | ||
| Environmental sealing | ||
| Water proof | ||
| Dust proof | ||
| Shock proof | ||
| Crush proof | ||
| Freeze proof | ||
| Weight | 800g (1.76 lb) | 178g (0.39 lb) |
| Physical dimensions | 131 x 100 x 77mm (5.2" x 3.9" x 3.0") | 97 x 61 x 33mm (3.8" x 2.4" x 1.3") |
| DXO scores | ||
| DXO Overall score | 80 | not tested |
| DXO Color Depth score | 23.7 | not tested |
| DXO Dynamic range score | 13.4 | not tested |
| DXO Low light score | 1216 | not tested |
| Other | ||
| Battery life | 560 images | - |
| Type of battery | Battery Pack | - |
| Battery model | D-LI90 | D-LI92 |
| Self timer | Yes ( 2 or 12 seconds) | Yes (2 or 10 sec) |
| Time lapse shooting | ||
| Type of storage | Dual SD/SDHC/SDXC | SD/SDHC/SDXC, Internal |
| Card slots | 2 | Single |
| Retail cost | $639 | $210 |