Quick answer
The Pentax smc Pentax-FA* 400mm f/5.6 ED [IF] is a super telephoto telephoto lens covering 400mm at f/5.6 for the Pentax K mount. Its smaller maximum aperture favours daylight shooting and keeps the lens compact.
About this lens
The Pentax smc Pentax-FA* 400mm f/5.6 ED [IF] is a telephoto prime lens covering 400mm at f/5.6 for Pentax K mount cameras, with extra-low dispersion glass. It brings distant subjects closer for sports, wildlife and events.
Pentax smc Pentax-FA* 400mm f/5.6 ED [IF] specifications
What can you shoot with the Pentax smc Pentax-FA* 400mm f/5.6 ED [IF]?
At 400mm this is a super telephoto telephoto, which typically suits:
- Wildlife and birds
- Motorsport and field sports
- Distant subjects and the moon
Its smaller maximum aperture favours daylight shooting and keeps the lens compact.
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 | 400mm | 5.2° | 6.2° |
| APS-C | 1.5x | 600mm | 3.4° | 4.1° |
Frequently asked questions
What mount does the Pentax smc Pentax-FA* 400mm f/5.6 ED [IF] use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Pentax smc Pentax-FA* 400mm f/5.6 ED [IF]?
It is a fixed 400mm lens with a maximum aperture of f/5.6. That makes it a super telephoto lens.
Is the Pentax smc Pentax-FA* 400mm f/5.6 ED [IF] a prime or a zoom lens?
It is a prime lens with a fixed 400mm focal length. Primes usually open wider than zooms; this one opens to f/5.6.
What is the Pentax smc Pentax-FA* 400mm f/5.6 ED [IF] equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 600mm on full frame, with a 3.4° horizontal and 4.1° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Pentax smc Pentax-FA* 400mm f/5.6 ED [IF] 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.
