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 50 mm | Equiv. aperture (DoF) |
|---|---|---|
| Full frame | 50 mm · 47° | f/4.0 |
| APS-C | 75 mm · 32° | f/6.0 |
| APS-C (Canon) | 80 mm · 30° | f/6.4 |
| Micro Four Thirds | 100 mm · 24° | 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: 50 mm f/4 on full frame.
| Focal | Aperture | at 1 m | at 2 m | at 5 m | at 10 m | Hyperfocal | Blur @2 m |
|---|---|---|---|---|---|---|---|
| 50 mm | f/4 | 9.1 cm | 37.8 cm | 2.52 m | 12.4 m | 20.9 m | 0.9% |
| 50 mm | f/8 | 18.4 cm | 77.6 cm | 6.14 m | 218 m | 10.5 m | 0.4% |
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 50 mm | NPF at 50 mm, f/4 |
|---|---|---|---|
| Full frame | 1/50 s | 10 s | 6 s |
| APS-C | 1/80 s | 7 s | 5 s |
| APS-C (Canon) | 1/80 s | 6 s | 5 s |
| Micro Four Thirds | 1/100 s | 5 s | 5 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#
- Laowa 60mm f/2.8 2X Ultra-Macro f/2.8
- Sigma 70-200mm f/2.8 EX DG Macro HSM II f/2.8
- Sigma 70-300mm f/4-5.6 APO Macro Super II f/4–5.6
- Sigma 70-300mm f/4-5.6 DG Macro f/4–5.6
- Sigma 70-300mm f/4-5.6 DL Macro f/4–5.6
- Sigma 70mm f/2.8 EX DG Macro f/2.8
- Tamron AF 70-300mm f/4-5.6 Di LD Tele-Macro (1:2) f/4–5.6
- Tamron AF 70-300mm f/4-5.6 LD Macro 1:2 f/4–5.6
- Tamron SP AF 70-200mm f/2.8 Di LD (IF) Macro f/2.8
- Pentax smc Pentax-DA 35mm f/2.8 Macro Limited f/2.8
- Tamron 35-70mm f/3.5 CF Macro f/3.5
- Sigma 28-300mm f/3.5-6.3 Macro ASP IF f/3.5–6.3
Frequently asked questions#
Is the Pentax smc Pentax-M Macro 1:4 50mm full frame?
Yes — it covers the full 36 × 24 mm frame.
What is the Pentax smc Pentax-M Macro 1:4 50mm equivalent to on APS-C?
On a 1.5× APS-C body it frames like 75 mm, and like 80 mm on Canon APS-C.
What is the Pentax smc Pentax-M Macro 1:4 50mm good for?
As a macro it suits close-ups of insects, flowers, products and details at up to life size.
Sources & licences#
- Lensfun lens database — CC BY-SA 3.0
Last updated October 03, 2026 · How we calculate · Sources