Pentax D FA 645 25mm F4 is a Fixed aperture Auto Focus (AF)
Ultra-Wideangle Prime lens with 645 max sensor coverage, and it is designed to be used with
645AF2 Mount cameras.
What type of photography is the Pentax D FA 645 25mm F4 lens good for?
The choice of photography type for which you intend to use the Pentax D FA 645 25mm F4 is a crucial decision factor. Below, we have assessed its suitability for various photography scenarios:
Reasons to Buy the Pentax smc D FA 645 25mm F4 AL IF SDM AW Lens
Here we've included a summary of the advantages and disadvantages of the Pentax smc D FA 645 25mm F4 AL IF SDM AW lens in a list form to assist you in determining whether it offers the features you need.
| Weather-sealed |
| Autofocus |
| Distance Scale |
| DoF(Depth of Field) Scale |
| Hood supplied |
| Full-time Manual Focusing |
| 9 Diaphragm Blades for Smooth Bokeh |
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| Not so fast for a short Prime Lens |
| Heavy |
Lens Mount
Pentax D FA 645 25mm F4 is compatible with cameras that have a Pentax 645AF2 lens mount. Some of the latest released cameras that are compatible with the Pentax 645AF2 lenses are Pentax 645Z, Pentax 645D and .
Size, Weight and Filter Thread
The size and weight are crucial factors to consider when searching for your next lens. Pentax D FA 645 25mm F4 has a maximum diameter of 90mm and a total length of 140mm. It weighs 1070g / 37.7 oz.
Pentax D FA 645 25mm F4 has a filter thread of 41mm. Below are links to the filters that we recommend you to consider for your Pentax D FA 645 25mm F4:
You can also check All Pentax 645AF2 Mount Lenses with 41mm Filter Thread Size to find the matching lenses.
Focal Range
Pentax D FA 645 25mm F4 has a fixed focal length of 25mm.
Weather Sealings
The Pentax D FA 645 25mm F4 is a weather-sealed lens, which provides extra protection to prevent water and dust get inside the lens and camera body under light rain, snow and wind. In order to have effective protection, you have to pair the Pentax D FA 645 25mm F4 with a weather-sealed camera body such as the Pentax 645Z, Pentax 645D and .
Optical Image Stabilization
Pentax D FA 645 25mm F4 doesn't have an optical image stabilization system so the only option to stabilize the image taken with this lens is to mount on a camera body with IBIS (sensor based In-body image stabilization).
Maximum Magnification Ratio
Pentax D FA 645 25mm F4 has a Max Magnification Ratio of 0.11x with a minimum focusing distance of 0.4m. 0.11x ratio is quite low, making this lens unsuitable even for modest close-up photography.
Aperture
The Pentax smc D FA 645 25mm F4 AL IF SDM AW features a maximum aperture of F4 and can be stopped down to a minimum aperture of F32. While a maximum aperture of F4 requires a bit more ambient light or a bump in ISO when shooting indoors, it keeps the physical size of the lens much smaller and easier to carry. Given the wider 25mm 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 F32 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
Pentax D FA 645 25mm F4's optical formula consists of 12 elements in 8 groups .
Lens Hood
Pentax D FA 645 25mm F4 comes with a built-in lens hood which is handy to reduce lens flare and glare in your photos.
Body Colour
Pentax D FA 645 25mm F4 is available in Black color.
Popular Comparisons of Pentax D FA 645 25mm F4
Here are the 8 most popular comparisons of the Pentax D FA 645 25mm F4 amongst Camera Decision readers.
Top Alternatives of Pentax D FA 645 25mm F4 Lens
In addition, it would be interesting to check which lenses from other mounts are most commonly compared with the Pentax smc D FA 645 25mm F4 AL IF SDM AW.
Top Alternatives of Pentax D FA 645 25mm F4 in Other Lens Mounts
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