Specifications#
Equivalent focal length on different cameras#
Field of view and depth-of-field equivalence when this lens is used on bodies with different sensor sizes (natively or via an adapter).
| Camera format | At 75 mm | At 106 mm | At 150 mm | Equiv. aperture (DoF) |
|---|---|---|---|---|
| Full frame | 75 mm · 32° | 106 mm · 23° | 150 mm · 16° | f/4.0 |
| APS-C | 112 mm · 21° | 159 mm · 15° | 225 mm · 11° | f/6.0 |
| APS-C (Canon) | 120 mm · 20° | 170 mm · 14° | 240 mm · 10° | f/6.4 |
| Micro Four Thirds | 150 mm · 16° | 212 mm · 12° | 300 mm · 8° | f/8.0 |
Depth of field & background blur#
Computed on its native Full frame format (CoC 30 µm). “Blur @2 m” is the size of an out-of-focus point at infinity, as a percentage of frame width, with the subject at 2 m — a simple bokeh index. Full table: 85 mm f/4 on full frame.
| Focal | Aperture | at 1 m | at 2 m | at 5 m | at 10 m | Hyperfocal | Blur @2 m |
|---|---|---|---|---|---|---|---|
| 75 mm | f/4 | 3.9 cm | 16.5 cm | 1.06 m | 4.43 m | 47.0 m | 2.0% |
| 75 mm | f/8 | 7.9 cm | 33.1 cm | 2.20 m | 10.3 m | 23.5 m | 1.0% |
| 106 mm | f/4 | 1.9 cm | 8.1 cm | 52.4 cm | 2.14 m | 93.7 m | 4.1% |
| 106 mm | f/8 | 3.8 cm | 16.2 cm | 1.06 m | 4.42 m | 46.9 m | 2.1% |
| 150 mm | f/4 | 0.9 cm | 3.9 cm | 25.9 cm | 1.05 m | 188 m | 8.4% |
| 150 mm | f/8 | 1.8 cm | 7.9 cm | 51.9 cm | 2.12 m | 93.9 m | 4.2% |
Handheld & night-sky limits#
NPF assumes typical 20–24 MP sensors (≈6 µm pixels on full frame, ≈3.9 µm on APS-C, ≈3.3 µm on Micro Four Thirds).
| Body | Min. handheld shutter (longest focal) | 500 rule at 75 mm | NPF at 75 mm, f/4 |
|---|---|---|---|
| Full frame | 1/160 s | 7 s | 4 s |
| APS-C | 1/250 s | 4 s | 3 s |
| APS-C (Canon) | 1/250 s | 4 s | 3 s |
| Micro Four Thirds | 1/320 s | 3 s | 3 s |
Compatible cameras#
Bodies in our database with a native Pentax K mount.
- Ricoh Pentax KF 2022
- Ricoh Pentax K-3 Mark III 2021
- Pentax K-1 II 2018
- Ricoh Pentax KP 2017
- Ricoh Pentax K-1 2016
- Ricoh Pentax K-70 2016
- Ricoh Pentax K-3 II 2015
- Pentax K-3 2013
- Pentax K-50 2013
- Pentax K-01 2012
- Pentax K-5 II 2012
- Pentax K-30 2012
- Pentax K-5 IIs 2012
- Pentax K-5 2010
- Pentax K-r 2010
- Pentax K-x 2010
- Pentax K200D 2008
- Pentax K20D 2008
- Pentax K-m 2008
- Pentax K110D 2006
- Pentax K100D 2006
- Pentax K10D 2006
- Pentax *ist DL2 2006
- Pentax *ist DL 2005
- Pentax *ist DS 2004
- Pentax *ist D 2003
- Pentax MZ-S 2001
- Pentax LX 1980
- Pentax ME 1977
- Ricoh XR-1 1977
- Pentax MX 1976
- Pentax K-7
- Pentax K-S1
- Pentax K-S2
- Pentax K2000
- Pentax *ist DS2
- Pentax K100D Super
- Samsung GX-10
- Samsung GX-1L
- Samsung GX-1S
Adapt it to other systems#
Similar lenses#
- Pentax smc Pentax-M 80-200mm f/4.5 f/4.5
- Tamron AF 80-210mm f/4.5-5.6 280D f/4.5–5.6
- Tokina 80-200mm f/4.5-5.6 SZ-X f/4.5–5.6
- Tokina AF 80-200mm f/2.8 AT-X 828 Pro f/2.8
- Tokina AT-X AF SD 80-400mm f/4.5-5.6 f/4.5–5.6
- Pentax HD Pentax-D FA* 70-200mm f/2.8 ED DC AW f/2.8
- Sigma 70-200mm f/2.8 EX DG HSM f/2.8
- Sigma 70-200mm f/2.8 EX DG OS HSM f/2.8
- Sigma 70-300mm f/4-5.6 DG OS f/4–5.6
- Pentax smc Pentax DA* 60-250mm f/4 IF SDM f/4
- Sigma 100-300mm f/4 APO EX DG HSM f/4
- Sigma 100-300mm f/4 APO EX DG HSM + Kenko Teleplus PRO 300 AF 1.4× DGX ext. f/4
Frequently asked questions#
Is the Pentax smc Pentax-M 75-150mm f/4 full frame?
Yes — it covers the full 36 × 24 mm frame.
What is the Pentax smc Pentax-M 75-150mm f/4 equivalent to on APS-C?
On a 1.5× APS-C body it frames like 112–225 mm, and like 120–240 mm on Canon APS-C.
What is the Pentax smc Pentax-M 75-150mm f/4 good for?
As a telephoto zoom it suits sport, wildlife, events and compressed landscapes.
Sources & licences#
- Lensfun lens database — CC BY-SA 3.0
Last updated October 03, 2026 · How we calculate · Sources