News, Tips & Reviews
B&H Gift Cards
The Professional's Source Since 1973
Ask Our Experts800-606-6969
Hello, Log InAccount & Orders
My Cart
Video Chat with a Photography Expert - Live
Home

FotodioX Pro Lens Mount Adapter for Pentax 645 Lens to Canon EF-Mount Camera

BH #FOPCEAP645 • MFR #P645-EOS-PRO
5 reviews
Print
FotodioX Pro Lens Mount Adapter for Pentax 645 Lens to Canon EF-Mount Camera
Key Features
  • Pentax 645 Lens to EF-Mount DSLR
  • Maintains Infinity Focus
  • All-Metal Construction with Brass Mount
This Pro Lens Adapter from Fotodiox enables the use of your Pentax 645 lenses on Canon EF-mount DSLR cameras. It features a durable brass construction with stainless steel finish, a leaf spring ensures a secure connection between the lens and adapter, and its design also maintains infinity focus.
More Details
Special Order
Expected availability: Mid Jul 2026
No Store Display
$53.60
+
Save the Tax‡
when you use the Payboo credit card. Learn More
Add to Cart
Free Standard Shipping
Protect Your Gear
Add a protection plan from $10.79
See Options
Ask an Expert
800-606-6969

FotodioX P645-EOS-PRO Overview

This Pro Lens Adapter from Fotodiox enables the use of your Pentax 645 lenses on Canon EF-mount DSLR cameras. It features a durable brass construction with stainless steel finish, a leaf spring ensures a secure connection between the lens and adapter, and its design also maintains infinity focus.

This manual adapter does not maintain automatic lens control between the camera and lens; aperture priority or manual shooting modes should be used, as well as stop-down metering for exposure control.
UPC: 812759010090

FotodioX P645-EOS-PRO Specs

Item Type
1x Lens Mount Adapter
Camera Compatibility
Canon EF Mount
Lens Compatibility
Pentax 645 Mount
Electronic Communication
No
Included Shims
Materials
Brass
Packaging Info
Package Weight
0.3 lb
Box Dimensions (LxWxH)
3.7 x 3.35 x 1.7"

FotodioX P645-EOS-PRO Reviews

Simply Works

By David
Rated 5 out of 5
Date: 2021-03-22

I'm using this adapter with Pentax 645 lenses on a Blackmagic 6k camera with EF mount. Works very well. Snug fit on both lens and camera ends. This adapter allows me to use the aperture ring on the lens to change aperture.

Most cost effective thing I've bought.

By Bob
Rated 5 out of 5
Date: 2018-10-21

Well engineered adapter. DHL/Australia post delivery efficient. I use the adapter with Pentax 645 lenses, and in conjunction with a 645 lens reversing ring I use it on a Sinar Norma technical camera with Schneider Kreuznach lenses.

See any errors on this page?

question

If a 200mm 645 lens (original manual focus) is mounted on a Canon 5D II what magnification (or reduction) will result?
Asked by: Anonymous
There is a crop factor of .78 so a 200mm 645 lens on a full frame 35mm DSLR is going to be around 256mm.
Answered by: Robert K.
Date published: 2018-08-28

question

Hi, does this adapter allow me to control the lens aperture on Pentax 645 FA and D-FA lenses.I cannot quite see by the photos if this is possible.I assume that you can turn the outside of the adapter to adjust the aperture.Please confirm.Many thanks, Scott
Asked by: Anonymous
When using the FotodioX Pentax 645 Pro Lens Adapter for Canon EF-Mount cameras, if the lens has an aperture ring, you can adjust the aperture manually.
Answered by: Heather S.
Date published: 2018-08-28

question

Re: FotodioX Pro Lens Mount Adapter for Pentax 645 Lens to Canon EFJust wondering, anyone know how well this this adapter fits the Pentax lenses? I bought a different brand from a local dealer, but the slightest touch of the release button and the lens comes off!I'd like to know if the FotodioX one is more secure.Thanks.
Asked by: Robert S.
It works perfectly. I'm happy with it it.
Answered by: elia z.
Date published: 2018-08-28
  • y_2026, m_5, d_23, h_13CST
  • bvseo_bulk, prod_bvqa, vn_bulk_3.0.46
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_3
  • loc_en_US, sid_995139, prod, sort_[SortEntry(order=HAS_STAFF_ANSWERS, direction=DESCENDING)]
  • clientName_bhphotovideo
Whatever You Need, We've Got It