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SMC Pentax 645 LS 75mm F2.8 Review RSS Feed

SMC Pentax 645 LS 75mm F2.8

Reviews Views Date of last review
1 39,283 Mon April 4, 2011
Recommended By Average Price Average User Rating
100% of reviewers $700.00 10.00
SMC Pentax 645 LS 75mm F2.8


Normal lens in the 645 film format. In the 645 digital format it has the field of view of a short telephoto lens. The lens is manual focus only.

This lens has a built-in leaf shutter which allows for high speed flash synchronization. The top speed with flash is 1/500s. The flash must be connected to the lens with an X-synch cord.

The lens can also be used without the leaf shutter as an ordinary 645 lens. It has no A setting so Program and Tv exposure modes are not supported. While the lens was designed for use on Pentax 645 film cameras it will also work on the 645D and 645Z.

smc Pentax 645 LS 75mm F2.8
©, sharable with attribution
Image Format
645 film
Lens Mount
Pentax 645
Aperture Ring
Yes (no A setting)
Automatic, 5 blades
6 elements, 5 groups
Mount Variant
Check camera compatibility
Max. Aperture
Min. Aperture
Min. Focus
75 cm
Max. Magnification
Filter Size
58 mm
Internal Focus
Field of View (Diag. / Horiz.)

645 Digital: 40 ° / 33 °
645 Film: 50 ° / 41 °
RH-A 58mm screw-in
Lens Cap
Plastic clip-on
Weather Sealing
Other Features
Leaf Shutter
Diam x Length
76 x 49.5 mm (3 x 2 in.)
365 g (12.9 oz.)
Production Years
Engraved Name
smc PENTAX 645 LS 1:2.8 75mm
User reviews
Fastest flash sync speed: 1/500 s. P and Tv exposure automation is not possible with this lens.
Manual FocusAperture RingMedium-Format SupportAdapter needed for DSLRsDiscontinued

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New Member

Registered: March, 2011
Location: arlington va
Posts: 18
Lens Review Date: April 4, 2011 I can recommend this lens: Yes | Price: $700.00 | Rating: 10 

Pros: normal angle of view, daylight fill flash
Cons: multiple steps to make an image using shutter

i am posting a review because i have had some past experience using this lens for outdoor fill flash and general photography

if i had one wish it would be that they offered a slightly wider shutter lens perhaps 60mm or even 50mm

my go to prime has always been the 55mm because you can image just about any 'event' with it and get good results

75mm is too tight for larger groups and if you are doing lots of portraits get the 135mm shutter lens.

the lens has a shutter cocking ring, a pc flash sync socket, and shutter speed setting ring with

shutter settings are o, 60, 125, 250, 500

the o setting is used to set the lens to non-lens shutter use

i have had no problems using the hot shue - ps sync cord adaptor to use a 280t or 500ftz flash

the pc socket is safe to use with studio flash units like the photogenic powerlight units

if you forget to cock the lens shutter you will not get an exposure because the lens shutter will remain drop a frame

one must also use caution in cocking the shutter as to not change the shutter speed

my experience has been using the lens with a 645 and 645n and both these cameras the camera shutter goes to 'ls' when the lens is cocked and the lens shutter is set to a speed

i have not been about to distinguish a difference between the 'standard' 75mm lens and the 'shutter' lens

i know the construction formula is different and that means there must be a difference in image quality, but it must be minor

in closing, this is a must have lens for outdoor daylight fill flash

it also makes a good 'standard' lens
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