Hi everyone

Mesrops · 01-31-2021, 11:22 AM

Hello everyone. I just registered in this forum and I wanna ask you guys a question. So recently I have purchased a Pentax 645z and before that I was using a canon camera. So I was wondering if you guys know any lens adapter that can adapt my canon lenses to my Pentax 645z.

Thank you.

**Nakedgun** · 01-31-2021, 11:59 AM - **1 Like**

Welcome!
(although, I cannot answer your question)

**Kerrowdown** · 01-31-2021, 01:46 PM - **1 Like**

Welcome to the forum from the Highlands of Scotland, I'm not aware of an adaptor... but hey I'm expert on such matters.

**Michail_P** · 01-31-2021, 01:50 PM - **1 Like**

Welcome to the community! Although I too cannot be of any assistance, I'm sure there's someone here who will.. Greetings from Greece>!

MarkJerling · 01-31-2021, 02:22 PM

Originally posted by Mesrops

Hello everyone. I just registered in this forum and I wanna ask you guys a question. So recently I have purchased a Pentax 645z and before that I was using a canon camera. So I was wondering if you guys know any lens adapter that can adapt my canon lenses to my Pentax 645z.

Thank you.

I've never seen one, no.

**PJ1** · 01-31-2021, 03:09 PM

Welcome to the Forums from Australia. The sensor size for the 645Z is 43.8x32.8 mm so a full frame lens which only covers 36x24 mm would probably not cover the sensor. But a bigger problem would be the registration distance. The registration distance (that is, the rear of the lens mount to the sensor) is 70.87 mm for Pentax 645 lenses but only 44 mm for Canon DSLR (or Full Frame film) lenses. That means an adapter would have to place the lens 26.87 mm inside the camera body for it to focus correctly. That is why you will not find any adapters. You could (maybe) work out a way to reverse mount a Canon lens and use it for macro work but that is out of my field of knowledge..

**ProfessorBuzz** · 02-01-2021, 06:43 AM - **1 Like**

You'll find adapters that go from Pentax 6x7, older Hasselblad lenses, and a few others, which are designed to illuminate large focal plane image circles and have longer back-focus (flange to focal plane) distance. You can't take a short back-focus lens designed to only illuminate a 35mm file frame and get it to go the other way without an adapter with optics. The demand isn't there for this. Plus. most Canon lenses these days also require electronics to drive the aperture, and sometimes the focus motor too.

---------- Post added 02-01-21 at 06:43 AM ----------

BTW I forgot to say CONGRATULATIONS on the 645Z. My Canon gear collects dust because of it.

Mesrops · 02-04-2021, 02:44 AM - **1 Like**

Thank you guys for the all the informations . Looks like I have got into a really friendly place with good people !

Thank you to everyone again.

01-31-2021, 11:22 AM	#1
Mesrops New Member Join Date: Jan 2021 Posts: 2	Hi everyone Hello everyone. I just registered in this forum and I wanna ask you guys a question. So recently I have purchased a Pentax 645z and before that I was using a canon camera. So I was wondering if you guys know any lens adapter that can adapt my canon lenses to my Pentax 645z. Thank you.

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01-31-2021, 11:59 AM - 1 Like	#2
Nakedgun Loyal Site Supporter Join Date: Apr 2014 Location: Southwest Posts: 1,365	Welcome! (although, I cannot answer your question)

01-31-2021, 01:46 PM - 1 Like	#3
Kerrowdown PEG Moderator Join Date: Aug 2008 Location: Highlands of Scotland... "Hold Infinity in the palm of your hand" - William Blake Photos: Gallery Posts: 57,860	Welcome to the forum from the Highlands of Scotland, I'm not aware of an adaptor... but hey I'm expert on such matters.

01-31-2021, 01:50 PM - 1 Like	#4
Michail_P Site Supporter Join Date: Nov 2019 Location: Kalymnos Photos: Gallery Posts: 3,006	Welcome to the community! Although I too cannot be of any assistance, I'm sure there's someone here who will.. Greetings from Greece>!

01-31-2021, 02:22 PM	#5
MarkJerling Moderator Site Supporter Join Date: May 2012 Location: Wairarapa, New Zealand Photos: Gallery \| Albums Posts: 20,421	Originally posted by Mesrops Hello everyone. I just registered in this forum and I wanna ask you guys a question. So recently I have purchased a Pentax 645z and before that I was using a canon camera. So I was wondering if you guys know any lens adapter that can adapt my canon lenses to my Pentax 645z. Thank you. I've never seen one, no.

01-31-2021, 03:09 PM	#6
PJ1 Loyal Site Supporter Join Date: Jul 2012 Location: Toowoomba, Australia Photos: Gallery \| Albums Posts: 5,486	Welcome to the Forums from Australia. The sensor size for the 645Z is 43.8x32.8 mm so a full frame lens which only covers 36x24 mm would probably not cover the sensor. But a bigger problem would be the registration distance. The registration distance (that is, the rear of the lens mount to the sensor) is 70.87 mm for Pentax 645 lenses but only 44 mm for Canon DSLR (or Full Frame film) lenses. That means an adapter would have to place the lens 26.87 mm inside the camera body for it to focus correctly. That is why you will not find any adapters. You could (maybe) work out a way to reverse mount a Canon lens and use it for macro work but that is out of my field of knowledge..

02-01-2021, 06:43 AM - 1 Like	#7
ProfessorBuzz Loyal Site Supporter Join Date: Feb 2018 Posts: 1,903	You'll find adapters that go from Pentax 6x7, older Hasselblad lenses, and a few others, which are designed to illuminate large focal plane image circles and have longer back-focus (flange to focal plane) distance. You can't take a short back-focus lens designed to only illuminate a 35mm file frame and get it to go the other way without an adapter with optics. The demand isn't there for this. Plus. most Canon lenses these days also require electronics to drive the aperture, and sometimes the focus motor too. ---------- Post added 02-01-21 at 06:43 AM ---------- BTW I forgot to say CONGRATULATIONS on the 645Z. My Canon gear collects dust because of it.

02-04-2021, 02:44 AM - 1 Like	#8
Mesrops New Member Join Date: Jan 2021 Posts: 2 Original Poster	Thank you guys for the all the informations . Looks like I have got into a really friendly place with good people ! Thank you to everyone again.