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SMC Pentax-DA 645 25mm F4 AL [IF] SDM AW Review RSS Feed

SMC Pentax-DA 645 25mm F4 AL [IF] SDM AW

Reviews Views Date of last review
3 42,659 Tue September 30, 2014
Recommended By Average Price Average User Rating
100% of reviewers $5,500.00 9.50
SMC Pentax-DA 645 25mm F4 AL [IF] SDM AW

SMC Pentax-DA 645 25mm F4 AL [IF] SDM AW
SMC Pentax-DA 645 25mm F4 AL [IF] SDM AW
SMC Pentax-DA 645 25mm F4 AL [IF] SDM AW


The SMC Pentax-DA 645 25mm F4 AL [IF] SDM AW is an ultra wide-angle lens with a field of view of 95.5 degrees diagonally.

It is identical to its D-FA series predecessor, except that its lens hood has been stretched to give better results on digital Pentax 645 bodies.  As a consequence this lens will now produce vignetting on Pentax 645 film bodies, so you should go for the D-FA version if you also shoot film.  This professional lens is fully weather-sealed and features silent autofocus.

The Pentax DA 645 25mm lens became available in April, 2012 for $4,995 and was discontinued in mid-2015 for unknown reasons.

smc Pentax-DA 645 25mm F4 AL[IF] SDM AW
©, sharable with attribution
Image Format
645 digital
Lens Mount
Pentax 645
Aperture Ring
Automatic, 9 blades (rounded)
12 elements, 8 groups
Mount Variant
645 AF2
Check camera compatibility
Max. Aperture
Min. Aperture
AF (in-lens motor)
Min. Focus
40 cm
Max. Magnification
Filter Size
40.5 mm (Rear drop-in)
Internal Focus
Field of View (Diag. / Horiz.)

645 Digital: 95.5 ° / 82.6 °
Lens Cap
Dedicated metal push-on
Aero Bright,SMC,SP
Weather Sealing
Yes (AW)
Other Features
AF/MF Switch,Drop-in Filter Holder
Diam x Length
90 x 148.5 mm (3.5 x 5.9 in.)
1040 g (w/o attachments) (36.7 oz.)
Production Years
2012 to 2015
Engraved Name
smc PENTAX-DA 645 1:4 25mm AL[IF] SDM AW
Product Code
User reviews
The DA 25mm is not recommended on film bodies due to vignetting (the lens hood is designed for the smaller 645 digital format).
No autofocus on film bodies.
The CPL filter can be turned with a knob on the filter holder.
Two aspherical elements.
Supersonic AutofocusQuick ShiftWeather SealedInternal FocusingBuilt-in HoodAutomatic ApertureMedium-Format SupportAdapter needed for DSLRs
Purchase URL: Buy the SMC Pentax-DA 645 25mm F4 AL [IF] SDM AW

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Veteran Member

Registered: May, 2014
Location: NSW, Australia
Posts: 335

7 users found this helpful
Lens Review Date: September 30, 2014 I can recommend this lens: Yes | Price: N/A | Rating: N/A 

Pros: Widest Lens for the 645 Digital Cameras
Cons: Chromatic Aberrations are present in corners but correctable in post.
Sharpness: 9    Aberrations: 8    Bokeh: 10    Handling: 10    Value: 10    Camera Used: 645Z   

Since buying the lens I hasn't really left my camera. Its really nice to able to shoot wider than what the 35mm lenses go. The drop in filters are handy to have and are perfect for my style of shooting. I don't need a front mounted filter ever so That was no issue for me. I was quite surprised how well this wide angle lens handles and especially that you can stitch large image panorama's with it as distortion is well corrected. Built quality is incredible as you would expect.

Here are a few Landscape Image examples from the lens on my 645Z.

And a 9 image panorama with the lens

New Member

Registered: January, 2011
Location: Brisbane
Posts: 9

8 users found this helpful
Lens Review Date: October 31, 2012 I can recommend this lens: Yes | Price: $5,000.00 | Rating: 10 

Pros: Clarity, sharpness
Cons: None
Sharpness: 10    Aberrations: 10    Bokeh: 9    Handling: 9    Value: 9    Camera Used: 645D   

I was lucky enough to be able to buy this lens recently and haven't had the opportunity to use it extensively yet, but what I have seen so far of the results are spectacular.
It produces the sharpest, clearest image straight out of the camera, that I have ever seen.
It is bulky, a bit heavy and rather expensive, but then, what would you expect from a lens of this calibre, so I can't say any of these things are negatives.
Anyway, I'll let an image prove the point for me.
I have shown the full frame, then 100% enlargements of the areas shown with a red rectangle in the full frame, in the top right corner, centre and centre left. All the small crops are original, unsharpened, straight out of the Raw file. I sharpened the full frame image a little, to give a better idea of its normal appearance, as of course, I had to downsize it radically to fit this space and it gained some softness in the process.

Inactive Account

Registered: January, 2011
Location: Munich
Posts: 4

1 user found this helpful
Lens Review Date: April 15, 2012 I can recommend this lens: Yes | Price: $6,000.00 | Rating: 9 

Pros: sharpness, contrast, colours
Cons: vignetting with external 100mm-filters
Sharpness: 9    Aberrations: 8    Bokeh: 9    Handling: 9    Value: 9    Camera Used: 645D   

a very nice lens, really beautiful colours, contrast and superb sharpness. In corners (8% of width or 5cm of 61,5 cm) it is getting soft. I think this is OK for such a wide angle but I know lenses which are better in corners.
As normal with wide-angles, there is distorsion. Even CA is good, too. But you see some, if 100% viewed;especially in high-contrast areas.
I built a lee-100mm-filter-holder and tested the lens with a nd 1.2 soft filter very close to hood but I had no chance to take pictures without vignetting in corners. If you get the filter close to lense you can minimize them. But only one filter is working quite good. More than one you have strong vignetting.
Everything is off superb quality, as expected regarding price...
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