Nikon W150 vs Pentax K-S1

The Nikon Coolpix W150 and the Pentax K-S1 are two digital cameras that were revealed to the public, respectively, in April 2019 and August 2014. The W150 is a fixed lens compact, while the K-S1 is a DSLR. The cameras are based on a 1/3.1-inch (W150) and an APS-C (K-S1) sensor. The Nikon has a resolution of 13 megapixels, whereas the Pentax provides 20 MP.

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

Headline Specifications

Nikon W150		Pentax K-S1
Fixed lens compact camera		Digital single lens reflex
30-90mm f/3.3-5.9		Pentax K mount lenses
13 MP – 1/3.1" sensor		20 MP – APS-C sensor
1080/30p Video		1080/30p Video
ISO 125-1,600		ISO 100-51,200
No viewfinder, LCD framing		Optical viewfinder
2.7" LCD – 230k dots		3.0" LCD – 921k dots
Fixed screen (not touch-sensitive)		Fixed screen (not touch-sensitive)
4.7 shutter flaps per second		5.4 shutter flaps per second
no shake reduction		In-body stabilization
Waterproof body (10m)		not weather sealed
220 shots per battery charge		410 shots per battery charge
110 x 67 x 38 mm, 177 g		121 x 93 x 70 mm, 558 g

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Going beyond this snapshot of core features and characteristics, what are the differences between the Nikon Coolpix W150 and the Pentax K-S1? 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 W150 and the Pentax K-S1 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 measures are rounded to the nearest millimeter.

The W150 can be obtained in five different colors (blue, orange, white, flower, resort), while the K-S1 is available in four color-versions (black, grey, orange, white).

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax K-S1 is considerably larger (53 percent) than the Nikon W150. It is worth mentioning in this context that the W150 is splash and dust resistant, while the K-S1 does not feature any corresponding weather-sealing. More than that, the W150 is water-proof up to 10m and can, thus, be used for underwater photography.

The above size and weight comparisons are to some extent incomplete and possibly misleading, as the W150 has a lens built in, whereas the K-S1 is an interchangeable lens camera that requires a separate lens. Attaching the latter will add extra weight and bulk to the setup.

The power pack in the W150 can be charged via the USB port, so that it is not always necessary to take the battery charger along when travelling.

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.

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 W150	110 mm	67 mm	38 mm	177 g	220	Y	Apr 2019	159	ebay.com
2.		Pentax K-S1	121 mm	93 mm	70 mm	558 g	410	n	Aug 2014	749	ebay.com
3.		Leica Q2	130 mm	80 mm	92 mm	718 g	370	Y	Mar 2019	4,995	amazon.com
4.		Nikon A1000	114 mm	72 mm	41 mm	330 g	250	n	Jan 2019	429	ebay.com
5.		Nikon B600	122 mm	82 mm	99 mm	500 g	280	n	Jan 2019	349	ebay.com
6.		Nikon D5300	125 mm	98 mm	76 mm	480 g	600	n	Oct 2013	799	ebay.com
7.		Nikon D5500	124 mm	97 mm	70 mm	470 g	820	n	Jan 2015	899	ebay.com
8.		Nikon P1000	146 mm	119 mm	181 mm	1415 g	250	n	Jul 2018	999	amazon.com
9.		Nikon W300	112 mm	66 mm	29 mm	231 g	280	Y	May 2017	389	ebay.com
10.		Panasonic TS7	117 mm	76 mm	37 mm	319 g	300	Y	May 2018	449	ebay.com
11.		Pentax K-500	130 mm	97 mm	71 mm	646 g	710	n	Jun 2013	549	ebay.com
12.		Pentax K-S2	123 mm	91 mm	73 mm	678 g	410	Y	Feb 2015	749	ebay.com
13.		Ricoh WG-6	118 mm	66 mm	33 mm	246 g	340	Y	Feb 2019	399	amazon.com
14.		Ricoh WG-60	123 mm	62 mm	30 mm	193 g	300	Y	Oct 2018	279	ebay.com
15.		Sony A68	143 mm	104 mm	81 mm	610 g	540	n	Nov 2015	699	ebay.com
16.		Sony RX0	59 mm	41 mm	30 mm	110 g	240	Y	Aug 2017	699	ebay.com
17.		Sony RX0 II	59 mm	41 mm	35 mm	132 g	240	Y	Mar 2019	699	amazon.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
Convert to Imperial

Any camera decision will naturally be influenced heavily by the price. The retail prices at the time of the camera’s release place the model in the market relative to other models in the producer’s line-up and the competition. The W150 was launched at a lower price than the K-S1, 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.

Sensor comparison

The size of the imaging sensor is a crucial determinant 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.

Of the two cameras under consideration, the Nikon W150 features a 1/3.1-inch sensor and the Pentax K-S1 an APS-C sensor. The sensor area in the K-S1 is 2194 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 7.4 and 1.5. The sensor in the W150 has a native 4:3 aspect ratio, while the one in the K-S1 offers a 3:2 aspect.

With 20MP, the K-S1 offers a higher resolution than the W150 (13MP), but the K-S1 nevertheless has larger individual pixels (pixel pitch of 4.28μm versus 1.11μm for the W150) due to its larger sensor. However, the W150 is a much more recent model (by 4 years and 7 months) than the K-S1, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixel-units. Coming back to sensor resolution, it should be mentioned that neither of the two cameras has an anti-alias filter installed, so they are able to capture all the detail the sensor resolves.

The resolution advantage of the Pentax K-S1 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the K-S1 for good quality output (200 dots per inch) amounts to 27.4 x 18.2 inches or 69.5 x 46.3 cm, for very good quality (250 dpi) 21.9 x 14.6 inches or 55.6 x 37.1 cm, and for excellent quality (300 dpi) 18.2 x 12.2 inches or 46.3 x 30.9 cm. The corresponding values for the Nikon W150 are 20.8 x 15.6 inches or 52.8 x 39.6 cm for good quality, 16.6 x 12.5 inches or 42.3 x 31.7 cm for very good quality, and 13.9 x 10.4 inches or 35.2 x 26.4 cm for excellent quality prints.

The Nikon Coolpix W150 has a native sensitivity range from ISO 125 to ISO 1600. The corresponding ISO settings for the Pentax K-S1 are ISO 100 to ISO 51200 (no boost).

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.

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 following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

Sensor Characteristics

		Camera Model	Sensor Class	Resolution (MP)	Horiz. Pixels	Vert. Pixels	Video Format	DXO Portrait	DXO Landscape	DXO Sports	DXO Overall
1.		Nikon W150	1/3.1	13.0	4160	3120	1080/30p	22.1	13.8	4058	65
2.		Pentax K-S1	APS-C	20.0	5472	3648	1080/30p	23.5	13.0	1061	78
3.		Leica Q2	Full Frame	46.7	8368	5584	4K/30p	26.4	13.5	2491	96
4.		Nikon A1000	1/2.3	15.9	4608	3456	4K/30p	20.7	12.2	1095	52
5.		Nikon B600	1/2.3	15.9	4608	3456	1080/30p	20.7	12.2	1095	52
6.		Nikon D5300	APS-C	24.0	6000	4000	1080/60p	24.0	13.9	1338	83
7.		Nikon D5500	APS-C	24.0	6000	4000	1080/60p	24.1	14.0	1438	84
8.		Nikon P1000	1/2.3	15.9	4608	3456	4K/30p	20.6	12.1	1044	51
9.		Nikon W300	1/2.3	15.9	4608	3456	4K/30p	20.5	12.0	938	50
10.		Panasonic TS7	1/2.3	20.2	5184	3888	4K/30p	20.6	12.1	1028	51
11.		Pentax K-500	APS-C	16.1	4928	3264	1080/30p	23.7	13.1	1087	79
12.		Pentax K-S2	APS-C	20.0	5472	3648	1080/30p	23.6	12.9	1514	79
13.		Ricoh WG-6	1/2.3	20.2	5184	3888	4K/30p	20.7	12.2	1104	52
14.		Ricoh WG-60	1/2.3	15.9	4608	3456	1080/60p	20.6	12.2	1072	51
15.		Sony A68	APS-C	24.0	6000	4000	1080/60i	24.1	13.5	701	79
16.		Sony RX0	1-inch	15.4	4800	3200	1080/60p	22.4	12.4	548	68
17.		Sony RX0 II	1-inch	15.4	4800	3200	4K/30p	22.1	12.4	555	65
Note: DXO values in italics represent estimates based on sensor size and age.

Many modern cameras are not only capable of taking still images, but also of capturing video footage. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, and both provide the same movie specifications (1080/30p).

Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. For example, the K-S1 has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the W150 relies on live view and the rear LCD for framing. The table below summarizes some of the other core capabilities of the Nikon W150 and Pentax K-S1 in connection with corresponding information for a sample of similar cameras.

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 W150	none	n	2.7 / 230	fixed	n	1/2000s	4.7/s	Y	n
2.		Pentax K-S1	optical	n	3.0 / 921	fixed	n	1/6000s	5.4/s	Y	Y
3.		Leica Q2	3680	n	3.0 / 1040	fixed	Y	1/2000s	10.0/s	n	Y
4.		Nikon A1000	1166	n	3.0 / 1036	tilting	Y	1/4000s	7.0/s	Y	Y
5.		Nikon B600	none	n	3.0 / 921	fixed	n	1/4000s	7.4/s	Y	Y
6.		Nikon D5300	optical	n	3.2 / 1037	swivel	n	1/4000s	5.0/s	Y	n
7.		Nikon D5500	optical	n	3.2 / 1037	swivel	Y	1/4000s	5.0/s	Y	n
8.		Nikon P1000	2359	n	3.2 / 921	swivel	n	1/4000s	7.0/s	Y	Y
9.		Nikon W300	none	n	3.0 / 921	fixed	n	1/4000s	7.0/s	Y	Y
10.		Panasonic TS7	1170	n	3.0 / 1040	fixed	n	1/1300s	10.0/s	Y	Y
11.		Pentax K-500	optical	n	3.0 / 921	fixed	n	1/6000s	6.0/s	Y	Y
12.		Pentax K-S2	optical	n	3.0 / 921	swivel	n	1/6000s	5.4/s	Y	Y
13.		Ricoh WG-6	none	n	3.0 / 1040	fixed	n	1/4000s	1.0/s	Y	n
14.		Ricoh WG-60	none	n	2.7 / 230	fixed	n	1/4000s	8.0/s	Y	n
15.		Sony A68	1440	Y	2.7 / 460	tilting	n	1/4000s	8.0/s	Y	Y
16.		Sony RX0	none	n	1.5 / 230	fixed	n	..	5.5/s	n	n
17.		Sony RX0 II	none	n	1.5 / 230	tilting	n	..	5.5/s	n	n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

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 W150 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).

Concerning the storage of imaging data, both the W150 and the K-S1 write their files to SDXC cards. The K-S1 supports UHS-I cards (Ultra High Speed data transfer of up to 104 MB/s), while the W150 cannot take advantage of Ultra High Speed SD 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 Coolpix W150 and Pentax K-S1 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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 W150	-	stereo / mono	-	-	micro	2.0	Y	-	Y
2.		Pentax K-S1	Y	stereo / mono	-	-	micro	2.0	-	-	-
3.		Leica Q2	Y	stereo / mono	-	-	-	-	Y	-	Y
4.		Nikon A1000	-	stereo / mono	-	-	micro	2.0	Y	-	Y
5.		Nikon B600	-	stereo / mono	-	-	micro	2.0	Y	-	Y
6.		Nikon D5300	Y	stereo / mono	Y	-	mini	2.0	Y	-	-
7.		Nikon D5500	Y	stereo / mono	Y	-	mini	2.0	Y	-	-
8.		Nikon P1000	Y	stereo / mono	Y	-	micro	2.0	Y	-	Y
9.		Nikon W300	-	stereo / mono	-	-	micro	2.0	Y	-	Y
10.		Panasonic TS7	-	stereo / mono	-	-	micro	2.0	Y	-	-
11.		Pentax K-500	Y	mono / mono	-	-	-	2.0	-	-	-
12.		Pentax K-S2	Y	mono / mono	Y	-	micro	2.0	Y	Y	-
13.		Ricoh WG-6	-	mono / mono	-	-	micro	3.0	-	-	-
14.		Ricoh WG-60	-	mono / mono	-	-	micro	2.0	-	-	-
15.		Sony A68	Y	stereo / mono	Y	-	micro	2.0	-	-	-
16.		Sony RX0	-	stereo / mono	Y	-	micro	2.0	Y	-	Y
17.		Sony RX0 II	-	stereo / mono	Y	-	micro	2.0	Y	-	Y

It is notable that the W150 offers wifi support, while the K-S1 does not. Wifi can be a very convenient means to transfer image data to an off-camera location.

Both the W150 and the K-S1 have been discontinued, but can regularly be found used on ebay. The K-S1 was replaced by the Pentax K-S2, while the W150 does not have a direct successor. Further information on the features and operation of the W150 and K-S1 can be found, respectively, in the Nikon W150 Manual (free pdf) or the online Pentax K-S1 Manual.

Review summary

So what conclusions can be drawn? Is the Nikon W150 better than the Pentax K-S1 or vice versa? A synthesis of the relative strong points of each of the models is listed below.

Reasons to prefer the Nikon Coolpix W150:

• Less disturbing: Has an electronic shutter option for completely silent shooting.
• Ready to shoot: Comes with a built-in lens, while the K-S1 requires a separate lens.
• More compact: Is smaller (110x67mm vs 121x93mm) and thus needs less room in the bag.
• Less heavy: Is lighter even though it comes with a built-in lens (unlike the K-S1).
• Easier travel charging: Can be conveniently charged via its USB port.
• Better sealing: Is weather sealed to enable shooting in dusty or wet environments.
• Water-proof: Is rugged and sealed and can thus be used for underwater photography (up to 10m).
• Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
• Easier wireless transfer: Supports Bluetooth for image sharing without cables.
• More affordable: Was introduced at a lower price, despite coming with a built-in lens.
• More modern: Reflects 4 years and 7 months of technical progress since the K-S1 launch.

Advantages of the Pentax K-S1:

• More detail: Has more megapixels (20 vs 13MP), which boosts linear resolution by 26%.
• Better image quality: Features bigger pixels on a larger sensor for higher quality imaging.
• Richer colors: The pixel size advantage translates into images with better, more accurate colors.
• More dynamic range: Larger pixels capture a wider spectrum of light and dark details.
• Better low-light sensitivity: Larger pixels means good image quality even under poor lighting.
• Easier framing: Has an optical viewfinder for image composition and settings control.
• Larger screen: Has a bigger rear LCD (3.0" vs 2.7") for image review and settings control.
• More detailed LCD: Has a higher resolution rear screen (921k vs 230k dots).
• Faster shutter: Has higher mechanical shutter speed (1/6000s vs 1/2000s) to freeze action.
• Faster burst: Shoots at higher frequency (5.4 vs 4.7 flaps/sec) to capture the decisive moment.
• More flexible: Makes it possible to change lenses and thus to use specialty optics.
• Longer lasting: Gets more shots (410 versus 220) out of a single battery charge.
• Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
• Better lighting: Features a hotshoe and can thus hold and trigger an external flash gun.
• Faster buffer clearing: Has an SD card interface that supports the UHS-I standard.
• More heavily discounted: Has been around for much longer (launched in August 2014).

If the number of relative strengths (bullet points above) is taken as a guide, the K-S1 is the clear winner of the contest (16 : 11 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 sports photographer will view the differences between cameras in a way that diverges from the perspective of a street photog, and a person interested in family portraits has distinct needs from a landscape 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 Nikon W150 and the Pentax K-S1 place the cameras among the top in their class? Find out in the latest Best Travel-Zoom Camera and Best DSLR 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 says little about, for example, the shooting experience and imaging performance of the W150 and the K-S1 in practical situations. 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 hands-on reviews by experts 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.

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 W150	..	+	..	..	3.5/5	3/5	Apr 2019	159	ebay.com
2.		Pentax K-S1	4/5	..	..	..	4.5/5	4/5	Aug 2014	749	ebay.com
3.		Leica Q2	..	..	4.5/5	84/100	4.5/5	4/5	Mar 2019	4,995	amazon.com
4.		Nikon A1000	..	+ +	3.5/5	..	3.5/5	3/5	Jan 2019	429	ebay.com
5.		Nikon B600	..	+	..	..	3.5/5	3/5	Jan 2019	349	ebay.com
6.		Nikon D5300	4/5	+ +	..	79/100	4.5/5	4.5/5	Oct 2013	799	ebay.com
7.		Nikon D5500	5/5	+	..	79/100	4.5/5	4.5/5	Jan 2015	899	ebay.com
8.		Nikon P1000	..	+	3.5/5	73/100	3.5/5	3.5/5	Jul 2018	999	amazon.com
9.		Nikon W300	..	+	..	..	4/5	4/5	May 2017	389	ebay.com
10.		Panasonic TS7	..	+	..	..	..	3.5/5	May 2018	449	ebay.com
11.		Pentax K-500	..	..	..	..	4.5/5	4.5/5	Jun 2013	549	ebay.com
12.		Pentax K-S2	4.5/5	..	..	..	5/5	4.5/5	Feb 2015	749	ebay.com
13.		Ricoh WG-6	..	..	..	..	3.5/5	3.5/5	Feb 2019	399	amazon.com
14.		Ricoh WG-60	..	..	..	..	..	..	Oct 2018	279	ebay.com
15.		Sony A68	3/5	..	..	..	4/5	4/5	Nov 2015	699	ebay.com
16.		Sony RX0	..	..	..	..	3.5/5	4/5	Aug 2017	699	ebay.com
17.		Sony RX0 II	..	..	..	..	3.5/5	4/5	Mar 2019	699	amazon.com
Note: (+ +) 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 rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

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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 a corresponding selection in the search boxes below. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.

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