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Pentax 35mm f/3.5 smc PENTAX-A 645 Manual Lens for Pentax 645, Black {77}

Model #290092
  • $421.00

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New in box complete with manufacturer's USA warranty. Not previously owned or used.
Essentially new with no signs of use. “Open box.” In manufacturer's packaging with original accessories and instructions. 180-day warranty.
Barely used with virtually no traces of wear. Only the closest inspections will reveal slight use. Lens glass could contain light dust or debris. Excellent picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Lightly used with limited signs of wear. Exceptionally nice but may have slight wear on finish visible. Lens glass could contain light dust or debris. Excellent picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Noticeably used with average signs of wear. Shows moderate wear for the age of the item, with the possibility of blemishes and/or minimal dings. Lens glass may have average dust and zoom/focus ring tension may have slight looseness or tightness overall, but will not affect picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Frequently used with above-average wear. May have dents, dings, or finish loss. Lens glass may have small scratches, dust, and blemishes, and zoom/focus ring tension may have moderate looseness or tightness overall, but should not affect picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Heavily used with extensive visible wear. Equipment is rough, with multiple impressions in the finish, excessive finish loss and brassing. Glass will have marks, fungus and/or heavy/cloudy haze which could affect picture quality. Accessories usually not included, unless noted in listing. Not covered under KEH warranty.
Non-functional or damaged. Equipment will not work. Usable for parts. Not covered under KEH warranty and non-returnable.
EX Excellent
With Caps
$421.00
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Pentax 645 wide prime built for medium format film work

The smc PENTAX-A 645 35mm f/3.5 is a dedicated wide-angle prime for the Pentax 645 system, covering the full 645 medium format frame at a field of view equivalent to roughly 22mm on 35mm film. That's genuinely wide on a 6x4.5 negative, giving landscape and architectural photographers the breathing room they need without resorting to stitched panoramas or digital corrections. The 77mm filter thread accepts standard grad ND and polarizer filters without adapters, which matters when you're shooting on location with a film kit.

Manual focus is the only option here, and the aperture ring gives you tactile, click-stopped control at every stop. The A-series designation means it integrates cleanly with Pentax 645 bodies that support aperture-priority automation, so you're not stuck shooting fully manual unless you want to be. The smc coating keeps contrast and flare in check even when shooting toward bright light sources, a real consideration at wide focal lengths where lens flare is a constant threat.

Who It's For

Film photographers shooting 645 format for landscape and environmental work get a genuinely wide perspective with full-frame coverage and no crop factor penalty. Architectural photographers benefit from the 35mm focal length's ability to include full building facades or interior spaces without distortion-heavy ultra-wides. Studio shooters using Pentax 645 digital backs gain a manual-focus wide prime that pairs with bodies supporting aperture-priority automation through the A-series coupling. Documentary photographers drawn to the 645 system for its image quality will find the aperture ring gives reliable exposure feedback in changing light.

Key Features

  • 35mm focal length prime for Pentax 645 medium format
  • Manual focus with tactile, click-stopped aperture ring
  • 77mm filter thread for standard screw-in filters
  • smc multicoating reduces flare and ghosting
  • A-series mount integrates with aperture-priority bodies
  • No autofocus or image stabilization

FAQ

What's the actual field of view on a Pentax 645 body?
At 35mm focal length on the 645 frame, you're looking at roughly 22mm equivalent on 35mm film - genuinely wide for landscapes and architecture without needing a shift lens or panorama mode.
Can I use this on aperture-priority mode?
Yes. The A-series designation means it works with Pentax 645 bodies that support aperture-priority automation, so you set the aperture on the lens ring and the camera meters and controls shutter speed.
Is autofocus an option?
No. This is a manual focus only lens, which is standard for most Pentax 645 primes. You focus via the focusing ring with tactile resistance.
What filters will fit without adapters?
The 77mm filter thread takes standard 77mm screw-in filters - grads, polarizers, NDs - without step rings or adapters.
How does the smc coating perform in backlit situations?
The smc multicoating is specifically designed to control flare and ghosting at wide apertures and wide focal lengths. You won't get magical flare immunity, but it keeps contrast intact when shooting toward light sources.
What's the minimum focus distance?
The body of this lens doesn't specify a published minimum focus distance in standard resources, so you'll want to test on your 645 body or contact Pentax directly for that detail.
Does this lens have weather sealing?
No. This is a film-era optic built for general use, not sealed against moisture or dust. Treat it with the care you'd give any vintage medium format prime.
SpecificationValue
Focal Length35mm
Max Aperturef/3.5
MountPentax 645
StabilizationNo
AF SystemNo
Lens TypePrime lens
Aperture RingYes
Filter Thread77 mm
ColorBlack

This description was generated using AI based on KEH's internal product standards, product expertise, and knowing what customers care about most. While we strive for accuracy, details may vary by individual item.

Brand Name Pentax
Filter Size 77mm
Focus Type Manual focus (only)
Lens Mount Pentax 645 A
Lens Type Wide-Angle
Max Focal Length 35mm
Min Focal Length 35mm