Quick answer
The Pentax smc Pentax-A 100mm f/4 Macro is a short telephoto macro lens covering 100mm at f/4.0 for the Pentax K mount. Its moderate maximum aperture works best in good light or with a higher ISO.
About this lens
Pentax smc Pentax-A 100mm f/4 Macro: a macro lens with a 100mm focal length and a maximum aperture of f/4, made for Pentax K mount cameras. It is intended for close-up work with small subjects such as flowers and insects.
Pentax smc Pentax-A 100mm f/4 Macro specifications
What can you shoot with the Pentax smc Pentax-A 100mm f/4 Macro?
At 100mm this is a short telephoto macro, which typically suits:
- Portraits with a flattering perspective
- Events and weddings
- Isolating subjects from the background
Its moderate maximum aperture works best in good light or with a higher ISO.
Full-frame equivalent and field of view
Calculated from the focal length and crop factor. Not measured.
| Sensor | Crop | Equivalent | Horizontal FOV | Diagonal FOV |
|---|---|---|---|---|
| Full frame | 1.0x | 100mm | 20.4° | 24.4° |
| APS-C | 1.5x | 150mm | 13.7° | 16.4° |
Frequently asked questions
What mount does the Pentax smc Pentax-A 100mm f/4 Macro use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Pentax smc Pentax-A 100mm f/4 Macro?
It is a fixed 100mm lens with a maximum aperture of f/4.0. That makes it a short telephoto lens.
Is the Pentax smc Pentax-A 100mm f/4 Macro a prime or a zoom lens?
It is a prime lens with a fixed 100mm focal length. Primes usually open wider than zooms; this one opens to f/4.0.
What is the Pentax smc Pentax-A 100mm f/4 Macro equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 150mm on full frame, with a 13.7° horizontal and 16.4° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Pentax smc Pentax-A 100mm f/4 Macro fit?
Any Pentax K-mount camera, including Pentax K-1, Pentax K-3, Pentax K-3 II, Pentax K-3 Mark III, and Pentax K-30 and 15 more.
Alternatives for Pentax K from other brands
All Pentax K lensesSame mount, overlapping focal range, closest maximum aperture first.
