Pentax Optio 430 Specs, Sensor Size & Crop Factor

Q: What is the crop factor of the Pentax Optio 430?

The Pentax Optio 430 has a crop factor of 4.85× relative to 35 mm full frame (diagonal 8.9 mm vs 43.3 mm).

4.85×

Crop factor

7.1×5.4 mm

Sensor size

38 mm²

Area · 4% of full frame

Specifications#

Brand: Pentax
Model: Optio 430
Camera type: Compact
Sensor size: 7.1 × 5.4 mm (1/1.7" sensor)
Crop factor: 4.85×

Specifications merged from Wikidata, Lensfun and openMVG. Spot an error? Tell us.

Sensor size compared#

The Pentax Optio 430 sensor (highlighted) drawn to scale against common formats. Its area is 4% of a full-frame sensor, which collects about 4.5 stops less total light at the same exposure.

Focal length equivalents & field of view#

Multiply any focal length by 4.85 to get the full-frame field of view. For fixed-lens cameras use the real focal length printed on the lens (e.g. “6.1–18.3 mm”), not the 35 mm equivalent.

Lens on this camera	Full-frame equivalent	Horizontal	Vertical	Diagonal
4 mm	19 mm	83.3°	67.9°	96.2°
4.5 mm	22 mm	76.6°	61.8°	89.5°
5 mm	24 mm	70.8°	56.6°	83.5°
6 mm	29 mm	61.3°	48.4°	73.3°
8 mm	39 mm	47.9°	37.2°	58.3°
10 mm	48 mm	39.1°	30.2°	48.1°
12 mm	58 mm	33.0°	25.3°	40.8°
15 mm	73 mm	26.7°	20.4°	33.1°
20 mm	97 mm	20.2°	15.3°	25.1°
25 mm	121 mm	16.2°	12.3°	20.2°
30 mm	145 mm	13.5°	10.3°	16.9°
40 mm	194 mm	10.2°	7.7°	12.7°
50 mm	242 mm	8.1°	6.2°	10.2°
70 mm	339 mm	5.8°	4.4°	7.3°
100 mm	485 mm	4.1°	3.1°	5.1°
150 mm	727 mm	2.7°	2.1°	3.4°

Depth of field table#

Total depth of field at each subject distance, using a circle of confusion of 6.2 µm (the 0.030 mm full-frame standard scaled by the crop factor).

Focal	Aperture	50.0 cm	1.00 m	2.00 m	3.00 m	5.00 m	10.0 m	Hyperfocal
4 mm	f/2	45.0 cm	3.79 m	∞	∞	∞	∞	1.30 m
4 mm	f/2.8	75.5 cm	∞	∞	∞	∞	∞	92.8 cm
4 mm	f/4	1.86 m	∞	∞	∞	∞	∞	65.1 cm
4 mm	f/8	∞	∞	∞	∞	∞	∞	32.7 cm
9 mm	f/2	7.5 cm	31.0 cm	1.34 m	3.46 m	18.2 m	∞	6.56 m
9 mm	f/2.8	10.6 cm	44.4 cm	2.08 m	6.49 m	∞	∞	4.69 m
9 mm	f/4	15.3 cm	66.7 cm	3.86 m	33.2 m	∞	∞	3.28 m
9 mm	f/8	33.0 cm	1.91 m	∞	∞	∞	∞	1.65 m
15 mm	f/2	2.7 cm	10.9 cm	44.2 cm	1.01 m	2.96 m	15.7 m	18.2 m
15 mm	f/2.8	3.7 cm	15.3 cm	62.6 cm	1.46 m	4.50 m	37.6 m	13.0 m
15 mm	f/4	5.3 cm	21.9 cm	91.7 cm	2.21 m	7.84 m	∞	9.11 m
15 mm	f/8	10.8 cm	45.5 cm	2.16 m	6.92 m	∞	∞	4.56 m
25 mm	f/2	0.9 cm	3.9 cm	15.7 cm	35.5 cm	99.5 cm	4.11 m	50.5 m
25 mm	f/2.8	1.3 cm	5.4 cm	22.0 cm	49.8 cm	1.41 m	5.99 m	36.1 m
25 mm	f/4	1.9 cm	7.7 cm	31.5 cm	71.7 cm	2.05 m	9.36 m	25.3 m
25 mm	f/8	3.8 cm	15.5 cm	64.1 cm	1.50 m	4.66 m	42.0 m	12.7 m

Equivalent aperture#

Exposure is identical at the same f-number on any format; equivalence only describes depth of field and total light.

Aperture on this camera	Full-frame equivalent (depth of field)	Hyperfocal at 9 mm
f/1.2	f/5.8	10.9 m
f/1.4	f/6.8	9.36 m
f/1.8	f/8.7	7.28 m
f/2	f/9.7	6.56 m
f/2.8	f/13.6	4.69 m
f/4	f/19.4	3.28 m
f/5.6	f/27.2	2.35 m
f/8	f/38.8	1.65 m

Night-sky exposure limits#

Longest exposure before stars trail. The NPF rule accounts for pixel pitch and is stricter than the classic 500 rule — use it for pin-sharp stars on high-resolution sensors. (NPF needs a known resolution and is omitted here.)

Focal length	500 rule
4 mm (19 mm eq.)	25.8 s
5 mm (24 mm eq.)	20.6 s
6 mm (29 mm eq.)	17.2 s
7 mm (34 mm eq.)	14.7 s
10 mm (48 mm eq.)	10.3 s

Open the NPF / 500 rule calculator →

Handheld shutter speed guide#

The reciprocal rule uses the equivalent focal length. High-resolution sensors may need one stop faster than this for pixel-sharp results.

Focal length	No stabilisation (1/equiv. focal)	With 3-stop IS	With 5-stop IBIS
5 mm	1/25 s	0.3 s	1.3 s
10 mm	1/50 s	1/6 s	0.6 s
21 mm	1/100 s	1/13 s	0.3 s
41 mm	1/200 s	1/25 s	1/6 s

Lens#

The Pentax Optio 430 has a built-in, non-interchangeable lens. Use the real focal length of that lens with the tables above; its full-frame equivalent is that number × 4.85.

Similar cameras#

Other 1/1.7" cameras from around the same time.

Frequently asked questions#

What is the crop factor of the Pentax Optio 430?

The Pentax Optio 430 has a crop factor of 4.85× relative to 35 mm full frame (diagonal 8.9 mm vs 43.3 mm).

What size is the Pentax Optio 430 sensor?

7.1 × 5.4 mm (1/1.7"), an area of 38 mm² — 4% of full frame.

Is the Pentax Optio 430 full frame?

No — its sensor is 1/1.7", which is 22.5× smaller in area than full frame.

How long can I expose the night sky with the Pentax Optio 430?

With a 5 mm lens (24 mm equivalent) the 500 rule gives 21 s.

Pentax Optio 430