HD Pentax-FA 31mm F1.8 Ltd is a Fixed aperture Auto Focus (AF)
Wideangle Prime lens with 35mm FF max sensor coverage, and it is designed to be used with
KAF Mount cameras.
What type of photography is the HD Pentax-FA 31mm F1.8 Ltd lens good for?
The choice of photography type for which you intend to use the HD Pentax-FA 31mm F1.8 Ltd is a crucial decision factor. Below, we have assessed its suitability for various photography scenarios:
There is only one more lens with the Pentax KAF mount that has the exact same focal and aperture range with the HD Pentax-FA 31mm F1.8 Ltd, the Pentax FA 31mm F1.8 L.
Lenses in Pentax KAF Mount with Same Focal and Aperture Range
Reasons to Buy the HD Pentax-FA 31mm F1.8 Limited Lens
Here we've included a summary of the advantages and disadvantages of the HD Pentax-FA 31mm F1.8 Limited lens in a list form to assist you in determining whether it offers the features you need.
| Autofocus |
| Aperture Ring |
| Distance Scale |
| DoF(Depth of Field) Scale |
| Hood supplied |
| Fast Aperture |
| Covers Full-Frame Sensor |
| 9 Diaphragm Blades for Smooth Bokeh |
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Buy HD Pentax-FA 31mm F1.8 Ltd from Amazon or B&H PHOTO
| No Weather Sealing |
| Pricey |
Lens Mount
HD Pentax-FA 31mm F1.8 Ltd is compatible with cameras that have a Pentax KAF lens mount. Some of the latest released cameras that are compatible with the Pentax KAF lenses are Pentax K-3 III Mono, Pentax KF and Pentax K-3 III.
Size, Weight and Filter Thread
The size and weight are crucial factors to consider when searching for your next lens. HD Pentax-FA 31mm F1.8 Ltd has a maximum diameter of 65mm and a total length of 69mm. It weighs 341g / 12.0 oz.
HD Pentax-FA 31mm F1.8 Ltd has a filter thread of 58mm. Below are links to the filters that we recommend you to consider for your HD Pentax-FA 31mm F1.8 Ltd:
You can also check All Pentax KAF Mount Lenses with 58mm Filter Thread Size to find the matching lenses.
Focal Range
HD Pentax-FA 31mm F1.8 Ltd has a fixed focal length of 31mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 46.5mm.
Maximum Magnification Ratio
HD Pentax-FA 31mm F1.8 Ltd has a Max Magnification Ratio of 0.16x with a minimum focusing distance of 0.3m. 0.16x ratio is quite low, making this lens unsuitable even for modest close-up photography.
Below are the 3 Wideangle Prime type Pentax KAF mount lens alternatives with highest max magnification ratios:
Aperture
The HD Pentax-FA 31mm F1.8 Limited features a maximum aperture of F1.8 and can be stopped down to a minimum aperture of F22. With an exceptionally wide F1.8 maximum aperture, this lens excels in challenging low-light environments, letting you shoot at lower ISO speeds to keep images clean and noise-free. Given the wider 31mm field of view, the background will naturally stay a bit more in focus, making it ideal for environmental portraits, street photography, or landscapes where context matters. The minimum setting of F22 is excellent for deep depth of field work like macro photography, though you may want to avoid the absolute smallest settings to skip the sharpness loss caused by optical diffraction.
Optical Formula
HD Pentax-FA 31mm F1.8 Ltd's optical formula consists of 9 elements in 7 groups . The following special elements are used in this design:
- HD
- Super Protect coatings
Lens Hood
HD Pentax-FA 31mm F1.8 Ltd comes with a removable lens hood which is handy to reduce lens flare and glare in your photos.
Body Colour
HD Pentax-FA 31mm F1.8 Ltd is available in Black and silver color.
Popular Comparisons of HD Pentax-FA 31mm F1.8 Ltd
Here are the 8 most popular comparisons of the HD Pentax-FA 31mm F1.8 Ltd amongst Camera Decision readers.
Top Alternatives of HD Pentax-FA 31mm F1.8 Ltd Lens
In addition, it would be interesting to check which lenses from other mounts are most commonly compared with the HD Pentax-FA 31mm F1.8 Limited.
Top Alternatives of HD Pentax-FA 31mm F1.8 Ltd in Other Lens Mounts
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