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Pentax Lens Review Database » Film Era Pentax K-Mount Lenses » FA Prime Lenses
SMC Pentax-FA 31mm F1.8 AL Limited Review RSS Feed

SMC Pentax-FA 31mm F1.8 AL Limited

Sharpness 
 9.5
Aberrations 
 8.5
Bokeh 
 9.6
Autofocus 
 8.8
Handling 
 9.5
Value 
 8.4
Reviews Views Date of last review
97 419,112 Tue November 21, 2023
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Recommended By Average Price Average User Rating
95% of reviewers $851.89 9.48
SMC Pentax-FA 31mm F1.8 AL Limited

SMC Pentax-FA 31mm F1.8 AL Limited
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SMC Pentax-FA 31mm F1.8 AL Limited
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SMC Pentax-FA 31mm F1.8 AL Limited
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Description:
This Limited lens features all-metal barrel and a built-in hood. It is known for delivering exceptional wide-angle image quality.



SMC Pentax-FA 31mm F1.8 AL Limited
© www.pentaxforums.com, sharable with attribution
Image Format
Full-frame / 35mm film
Lens Mount
Pentax K
Aperture Ring
Yes (A setting)
Diaphragm
Automatic, 9 blades
Optics
9 elements, 7 groups
Mount Variant
KAF
Check camera compatibility
Max. Aperture
F1.8
Min. Aperture
F22
Focusing
AF (screwdrive)
Quick-shift
No
Min. Focus
30 cm
Max. Magnification
0.16x
Filter Size
58 mm
Internal Focus
No
Field of View (Diag. / Horiz.)

APS-C: 50 ° / 42 °
Full frame: 70 ° / 60 °
Hood
Built-in
Case
Dedicated pouch
Lens Cap
Dedicated metal push-on
Coating
Ghostless,SMC
Weather Sealing
No
Other Features
Diam x Length
65 x 68.5 mm (2.6 x 2.7 in.)
Weight
345 g (12.2 oz.)
Production Years
2001 to 2021
Pricing
$1096 USD current price
$880 USD at launch
Engraved Name
smc PENTAX-FA 1:1.8 31mm AL Limited
Product Code
20280 (silver), 20290 (black)
Reviews
User reviews
In-depth review
Notes
One aspherical element, one ED element, one high refraction low dispertion element.
Variants

Black and silver


Features:
Screwdrive AutofocusBuilt-in HoodAperture RingAutomatic ApertureFull-Frame SupportDiscontinued
Purchase: Buy the SMC Pentax-FA 31mm F1.8 AL Limited
In-Depth Review: Read our SMC Pentax-FA 31mm F1.8 AL Limited in-depth review!
Sample Photos: View Sample Photos
Price History:



Add Review of SMC Pentax-FA 31mm F1.8 AL Limited Buy the SMC Pentax-FA 31mm F1.8 AL Limited
Author:
Sort Reviews by: Date | Author | Rating | Recommendation | Likes (Descending) Showing Reviews 91-97 of 97
Site Supporter

Registered: December, 2007
Location: Norway
Posts: 4,371
Review Date: March 20, 2008 Recommended | Rating: 10 

 
Pros: Image quality, Limited finish
Cons: Lens hood

This is Pentax best wide angle. Sharp at all apertures. Excellent built quality. Screwed in place hood prevent the use of some filter systems
   
Pentaxian

Registered: April, 2007
Location: Toronto/Victoria
Posts: 460
Review Date: August 3, 2007 Recommended | Price: $800.00 | Rating: 10 

 
Pros: Very high IQ, extremely well-built
Cons: Expensive, large-ish
Sharpness: 9    Aberrations: 9    Bokeh: 9    Autofocus: 9    Handling: 9    Value: 8    New or Used: New    Camera Used: K100D   

This is my standard lens. Unlike the fast 50mm normals I use on film, the 31 is good from F/1.8 to F/22. More importantly, it's drawing characteristics are very good, which is hard to find in a wide angle lens.

Obviously it is quite a bit more expensive than a 50mm lens, but only my K and M lenses can match it for build, and they're not AF nor auto-aperture.

It's also heavier than I'd like. It weighs almost as much as my K50/1.2.

For a normal on 1.5x it is a slightly faster and better built alternative to the FA35 which is already very good in its own right.

2021 update: on FF, this lens becomes an excellent wide angle. The built in hood can be annoying (the DA15 Limited has a clever retractable design), but image-wise this lens is hard to fault. I should add that I own the black version, and the paint is beginning to fall off just a bit. I have the silver 43 and 77 and they have no such issue.
   
New Member

Registered: March, 2007
Location: Norway
Posts: 1
Review Date: March 13, 2007 Recommended | Price: $500.00 | Rating: 10 

 
Pros: This lens is perfect in almost every way
Cons: Except for the lens hood and cap

Not much to add here. It is my pride and joy

I have added a heliopan metal hood which is perfectly straight and therefore fits inside the permanent hood and which accepts a standard 58mm Pentax lenscap.
   
Senior Member

Registered: October, 2006
Location: Masachusetts
Posts: 243
Review Date: March 10, 2007 Recommended | Rating: 10 

 
Pros: Sharp, great bokeh, solidly built. Perhaps one of the best AF lenses ever.
Cons: Hard to find black ones (my copy is black).

This is indeed one of the finest lenses ever made. Luminous Landscape called it one of the top 3 autofocus lenses ever made, and my experience is consistent with that conclusion.

On the digitals, it's a fantastic normal lens. Great for product shots and groups.

No more needs to be said. Get one.
   
Veteran Member

Registered: September, 2006
Location: West Chester, PA
Posts: 1,420
Review Date: January 11, 2007 Recommended | Price: $789.00 | Rating: 9 

 
Pros: Exceptional sharpness, smooth bokeh, great build, low light capabilities, good close focus
Cons: Chromatic aberration, purple fringing, lens hood

The sharpness of this lens - especially wide open - is amazing. I feel comfortable shooting this lens at all apertures knowing my image will be razor sharp in the plane of focus. Coupled with the smooth bokeh it really makes the focused image 'pop'.
It is solid and pretty big/heavy especially compared to the FA 35/2. I like the slide-on hood of the 77 Limited, but on the 31 it is clunkier and seems to just get in the way.
I've noticed similar chromatic aberration to the 77 Limited and I've also seen purple fringing on difficult high-contrast subjects.
Overall, one of my favorite lenses.
   
Veteran Member

Registered: October, 2006
Location: Melbourne, Australia
Posts: 11,783
Review Date: January 10, 2007 Recommended | Price: $785.00 | Rating: 10 

 
Pros: Light, beautiful, fantastic colour rendition and sharpness!
Cons: Not wide enough...
New or Used: New   

This is in deed a great lens to own.

Images are sharp even to the corners wide open; bokeh is invincible; CA is almost impossible; beautiful finish with a solid build

There is no need to stop down the aperture to get sharper images. The lens renders some sort of magic on protrait: more 3D, more sparkling feel to protraits. A all round lens like Fa 77 ltd

Minimal focusing distance is about 30 cm which is convinient for close ups and indoor shots. A versatile lens.

Recommended!

My sample shots here

My FA 31mm f1.8 shots
   
Veteran Member

Registered: November, 2006
Location: Sydney, Australia
Posts: 593

1 user found this helpful
Review Date: January 8, 2007 Recommended | Price: $1,000.00 | Rating: 10 

 
Pros: Image quality is without peer
Cons: Built in lens hood is not practical
Sharpness: 10    Aberrations: 9    Bokeh: 10    Autofocus: 9    Handling: 9    Value: 8   

The FA31mm f1.8 Limited is without peer as far as all aspects of image quality is concerned. Sharp, with excellent colour rendition and bokeh to die for.

Build quality is also excellent, but manual focus is not as good as the A or M series Pentax lenses, as is to be expected with an AF lens.

The only real problem with this lens is the lens hood. Not practical for either film or digital cameras, IMO. The hood makes it difficult to use filters like the Cokin/Lee products and therefore a custom type set up has to be made.
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