Forgot Password
Pentax Camera Forums Home
 
Log in or register to remove ads.

Pentax Lens Review Database » Film Era Pentax K-Mount Lenses » Pentax K-mount Teleconverters and Adapters
Pentax Adapter K for 645 Lens (645 to K mount) Review RSS Feed

Pentax Adapter K for 645 Lens (645 to K mount)

Reviews Views Date of last review
5 42,614 Sun June 18, 2023
spacer
Recommended By Average Price Average User Rating
100% of reviewers $155.00 9.40
Pentax Adapter K for 645 Lens (645 to K mount)

Pentax Adapter K for 645 Lens (645 to K mount)
supersize
Pentax Adapter K for 645 Lens (645 to K mount)
supersize
Pentax Adapter K for 645 Lens (645 to K mount)
supersize

Description:

This is an adapter allowing you to use Pentax 645 mount lenses on K-mount bodies, including DSLRs as well as film SLRs.

You will have to use stop down metering as the adapter neither has aperture contacts nor an aperture stop down lever.

Autofocus is not supported. AF lenses will have to be focused manually.


Pentax Adapter K for 645 Lens
© www.pentaxforums.com, sharable with attribution
Image Format
Full-frame / 35mm film
Lens Mount
Pentax K
Light Loss
0 stops
Magnification
1x
Optics
0 elements, 0 groups
Mount Variant (Rear)
K
Mount Variant (Front)
645 AF
Focusing
Manual
Coating
Weather Sealing
No
Case
Diam x Length
Weight
0
Production Years
(in production)
Notes
Engraved name: PENTAX ADAPTER K FOR 645 LENS
User reviews
This adapter allows for mounting Pentax 645 lenses on a K-mount camera.
The only exposure modes supported are M and Av with stop down metering, and Bulb. The adapter has no aperture stop down lever and no lens information contacts.
The adapter can be stacked with the 67 to 645 adapter thus allowing Pentax 6x7 lenses to be mounted on a K-mount camera.
Features:
Full-Frame Support
Price History:



Add Review of Pentax Adapter K for 645 Lens (645 to K mount)
Author:
Sort Reviews by: Date | Author | Rating | Recommendation | Likes (Descending) Showing Reviews 1-5 of 5
Junior Member

Registered: January, 2018
Location: Tokyo
Posts: 44

1 user found this helpful
Review Date: June 18, 2023 Recommended | Rating: 7 

 
Pros: It can adapt lenses
Cons: non

Just a note for those that - like me - might stumble upon the apparent issue of the external knob hitting the pentaprism box on K1 camera. I spent an afternoon in dismay trying to understand what was that wheel for, since nothing was moving or getting tightened or released, while it kept hitting the box, preventing the adapter to lock. Even the original instruction - which I found out on internet - did not explain that clearly (I suppose that back in those days adapters where scanty and that was a common practice).

Shortly said: it allow to rotate the mount of the adapter that lock onto the camera in multiple of 90º. So in case it hits your upper part of K1 when you get it, release the knob holding steady the adapter, grab the K-mount with your fingers and rotate it to 90º or 180º. I was quite surprised when I discovered it, because none of my other adapters for K1 ever behaved like that!
   
Loyal Site Supporter

Registered: October, 2018
Location: Quebec City, Quebec
Posts: 6,493
Review Date: June 5, 2020 Recommended | Price: $90.00 | Rating: 10 

 
Pros: Tight fit, excellent baffling, a must-have accessory.
Cons: None.


Pentax K1 mounted on a 645 FA 400 mm f/5.6, Av mode with stop-down metering @ f/11


Pentax K3 III mounted on a 645 FA* 300 mm f/4, Av mode with stop-down metering @ f/16


Pentax K3 mounted on the 645 Auto Bellows + 645 A 75 mm f/2.8, Av mode with stop-down metering @ f/11.
   
Veteran Member

Registered: September, 2017
Location: Medellín
Posts: 1,322

1 user found this helpful
Review Date: December 23, 2019 Recommended | Rating: 10 

 
Pros: Build quality, compatibility.
Cons: Knob hits mirror box on some DSLR camera models.

If you happen to have both systems, this does the trick with the best absolute fit you can find. The only thing you have to keep in mind, is that the rotation lock knob can hit the mirror box while attaching it to some DSLRs. I learned that the hard way.
   
Pentaxian

Registered: February, 2010
Location: Eerbeek
Posts: 1,850

1 user found this helpful
Review Date: December 5, 2011 Recommended | Price: $125.00 | Rating: 10 

 
Pros: sturdy, useful
Cons:

Excellent adapter, which I've used frequently. It is solid, and allows to use the excellent range of 645 lenses to be used on the digital cameras. No complaints.
I paid either 100 or 150$, I cannot remember to be honest, so I averaged it. It came from a forum member and was well looked after.
   
Site Supporter

Registered: February, 2009
Location: Wisconsin
Posts: 423

1 user found this helpful
Review Date: September 6, 2010 Recommended | Price: $250.00 | Rating: 10 

 
Pros: build quality
Cons: none

I paid a ton for this directly from Pentax, but I wanted it fast. It was on backorder everywhere else. It is a solid piece of equipment that should last forever. I use it to mount my FA645 120mm macro and FA645 80-160mm on my K-7.
Add Review of Pentax Adapter K for 645 Lens (645 to K mount)



All times are GMT -7. The time now is 12:16 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top