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 8.5 mm | Equiv. aperture (DoF) |
|---|---|---|
| Full frame | 8 mm · 137° | f/1.9 |
| APS-C | 13 mm · 118° | f/2.8 |
| APS-C (Canon) | 14 mm · 115° | f/3.0 |
| Micro Four Thirds | 17 mm · 104° | f/3.8 |
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: 14 mm f/2 on full frame.
| Focal | Aperture | at 1 m | at 2 m | at 5 m | at 10 m | Hyperfocal | Blur @2 m |
|---|---|---|---|---|---|---|---|
| 8.5 mm | f/1.9 | 4.03 m | ∞ | ∞ | ∞ | 1.28 m | 0.1% |
| 8.5 mm | f/4 | ∞ | ∞ | ∞ | ∞ | 61.1 cm | 0.0% |
| 8.5 mm | f/8 | ∞ | ∞ | ∞ | ∞ | 31.0 cm | 0.0% |
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 8.5 mm | NPF at 8.5 mm, f/1.9 |
|---|---|---|---|
| Full frame | 1/8 s | 59 s | 29 s |
| APS-C | 1/13 s | 39 s | 22 s |
| APS-C (Canon) | 1/13 s | 37 s | 21 s |
| Micro Four Thirds | 1/15 s | 29 s | 19 s |
Compatible cameras#
Bodies in our database with a native Pentax Q mount.
- Pentax Q10 2013
- Pentax Q7 2013
- Pentax Q 2011
- Pentax Q-S1
Frequently asked questions#
Is the Pentax 01 Standard Prime 8.5mm f/1.9 AL [IF] full frame?
Yes — it covers the full 36 × 24 mm frame.
What is the Pentax 01 Standard Prime 8.5mm f/1.9 AL [IF] equivalent to on APS-C?
On a 1.5× APS-C body it frames like 13 mm, and like 14 mm on Canon APS-C.
What is the Pentax 01 Standard Prime 8.5mm f/1.9 AL [IF] good for?
As a ultra-wide prime it suits astrophotography, landscapes and dramatic perspectives.
Sources & licences#
- Lensfun lens database — CC BY-SA 3.0
Last updated October 03, 2026 · How we calculate · Sources