645N lens adapter for K3

JDelaware · 02-10-2014, 02:32 PM

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Question.

I am about to purchase a K3 (super happy about this new addition) and I have two 645N lens'. Word on the street (AKA the Forum here) is that there is an adapter that will enable me to hook these never used lens to my new K3. So I have a burning desire to know if anyone has ever used this mysterious 645 to K mount adapter, and how much they liked it (pros/cons), and if there are any photos I could see.

I understand that in the perfect world I should just use the appropriate K3 lens, but unless I strike oil...those will have to wait. What I do have is enough in the bank to buy the adapter. I figure I can use the lens' I have and save, save, save up for the perfect scenarios unless this adapter is not a good idea and I should avoid it because it'll ruin my K3.

Your help and advice is very much appreciated.

Adam · 02-10-2014, 02:37 PM

Here's the adapter:
Pentax-K Adapter for 645 Reviews - Pentax K-mount Teleconverters and Adapters - Pentax Lens Reviews & Lens Database

It's literally just a hollow tube without linkages for the aperture coupler. It isn't available new anymore I don't think.

JDelaware · 02-10-2014, 02:41 PM

Originally posted by Adam

Here's the adapter:
Pentax-K Adapter for 645 Reviews - Pentax K-mount Teleconverters and Adapters - Pentax Lens Reviews & Lens Database

It's literally just a hollow tube without linkages for the aperture coupler. It isn't available new anymore I don't think.

I believe you are correct Adam. The adapter would be an old "new" purchase. I just feel dumb having all of these lens' I've never used just sitting there and when I found out I could hook it up to my new camera, I was very excited.

My biggest concern is, I don't want to mess up my K3.

**boriscleto** · 02-10-2014, 02:44 PM

The Pentax adapter is rather expensive for what it does.

PentaxWebstore.com:Adapter K for 645 Lenses (645 to 35mm) Adapter K for 645 Lenses (645 to 35mm)

The FotodioX adapter is more reasonable.

645 to k adapter | B&H Photo Video

The cons to adapting a 645 lens to K are 645 lenses are larger than K lenses, there is no camera aperture control or autofocus (stop down metering only), and 645 lenses tend to cost more than K lenses. But if you already have a 645 lens there is no inherent danger to the K-3 using an adapter (other than ingress of water, the adapter isn't WR).

JDelaware · 02-10-2014, 02:49 PM

Whoa Nelly, that's a giant price difference! Is it because one is Mamiya and the other is Pentax?

Adam · 02-10-2014, 02:52 PM

Originally posted by JDelaware

Whoa Nelly, that's a giant price difference! Is it because one is Mamiya and the other is Pentax?

It's because the genuine product is always a lot more

Does the fotodiox adapter have the aperture coupler? If not, then adapted lenses would work like Takumars.

Here's the guide to using/metering with manual lenses:
https://www.pentaxforums.com/forums/54-pentax-lens-articles/110657-how-use-me...k-x-k-7-a.html

JDelaware · 02-10-2014, 03:00 PM

Ooo, thank you for that Adam!

**boriscleto** · 02-10-2014, 03:10 PM

I didn't even notice that it was Mamiya 645...

There was a long thread about adapting non-K-mount lenses to K-mount.

https://www.pentaxforums.com/forums/22-pentax-camera-field-accessories/96884-...sions-lba.html

There are also plenty of 645 adapters on evilBay, both genuine and third party.

pentax 645 to k mount | eBay

Bleeblee · 02-10-2014, 04:46 PM

I bought a 645D and SO wanted to love it. It takes amazing photos, but truth be told, me thinks I'm not a good enough photographer to utilize its awesomeness. I'm thinking of selling it (Anyone interested? It's mint : ) ... but the lenses? Forget it... Those I'm keeping! They are tack sharp on my k5ii. I have a Pentax 645-k mount adapter. It's straightforward to install onto the camera, then I just pop the 645 lenses on. The macro is spectacular, and the wider lenses somehow render shots with a 3D feel. The lenses are heavy buggers though, but worth it for the yummy snaps!

Ole · 02-10-2014, 07:41 PM

Originally posted by JDelaware

Whoa Nelly, that's a giant price difference! Is it because one is Mamiya and the other is Pentax?

That adapter is unfortunately for Mamiya lenses, not for Pentax 645 lenses.

LennyBloke · 02-11-2014, 08:00 AM

Having owned a 3rd party 645 to K adapter and the Pentax original version I would highly recommend going for the Pentax. The 3rd party version I had did the job, but was a bit clunky and not particularly smooth, the Pentax version is beautifully made and all the bayonets fit beautifully against each other. This may not be the experience everyone has with a non-Pentax copy, but for me the difference in price is worth it

RAART · 02-14-2014, 07:37 AM

I have that Mamiya 645 adapter and is very good one, but it let you focus past infinity. I was assuming that OP had in his mind Mamiya adapter while I do not know if Pentax has "N" lenses like Mamiya does and he mention 645 N adapter... On the mflenses forum there is user with name IGOR that uses 645 Mamiya's on Pentax DSLR but he used them also on Nikon D800 or Canon cameras and does not matter which camera he uses the results are fantastic. I always loved those lenses and their rendering and while they affordable now I started getting them. The first one I got is Mamiya Sekor C 210mm F4 and LBA syndrome struck again...

Mamiya Sekor C 210mm f4
Mamiya Sekor C 150mm f2.8
Mamiya Sekor C 150mm f3.5 N
Mamiya Sekor C 110mm f2.8

YMMV!

**boriscleto** · 02-14-2014, 07:55 AM

Originally posted by RAART

I have that Mamiya 645 adapter and is very good one, but it let you focus past infinity. I was assuming that OP had in his mind Mamiya adapter while I do not know if Pentax has "N" lenses like Mamiya does and he mention 645 N adapter... On the mflenses forum there is user with name IGOR that uses 645 Mamiya's on Pentax DSLR but he used them also on Nikon D800 or Canon cameras and does not matter which camera he uses the results are fantastic. I always loved those lenses and their rendering and while they affordable now I started getting them. The first one I got is Mamiya Sekor C 210mm F4 and LBA syndrome struck again...

Mamiya Sekor C 210mm f4
Mamiya Sekor C 150mm f2.8
Mamiya Sekor C 150mm f3.5 N
Mamiya Sekor C 110mm f2.8

YMMV!

The OP was not looking for a Mamiya adapter. The 645N was an upgrade to the original Pentax 645 and uses the same mount, but with autofocus.

https://www.pentaxforums.com/forums/53-pentax-dslr-camera-articles/110932-pen...-compared.html

RAART · 02-14-2014, 08:06 AM

Sorry my mistake... I was going out strictly from manual focus lenses point and never thought that someone will use AF lens on Fotodiox adapters that does not support AF. Thank you for amending me!

JDelaware · 02-14-2014, 05:06 PM

Originally posted by Bleeblee

I bought a 645D and SO wanted to love it. It takes amazing photos, but truth be told, me thinks I'm not a good enough photographer to utilize its awesomeness. I'm thinking of selling it (Anyone interested? It's mint : ) ... but the lenses? Forget it... Those I'm keeping! They are tack sharp on my k5ii. I have a Pentax 645-k mount adapter. It's straightforward to install onto the camera, then I just pop the 645 lenses on. The macro is spectacular, and the wider lenses somehow render shots with a 3D feel. The lenses are heavy buggers though, but worth it for the yummy snaps!

BleeBlee, thank you for the snaps! I have decided to make the purchase for the adapter. I'm sure if it doesn't work out, I'll be back here looking for pointers.

I appreciate all of your feedback, and as soon as my new K3 arrives I will snap, snap, snap and upload for you all.

02-10-2014, 02:32 PM	#1
JDelaware New Member Join Date: Feb 2014 Posts: 19	645N lens adapter for K3 Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here. Question. I am about to purchase a K3 (super happy about this new addition) and I have two 645N lens'. Word on the street (AKA the Forum here) is that there is an adapter that will enable me to hook these never used lens to my new K3. So I have a burning desire to know if anyone has ever used this mysterious 645 to K mount adapter, and how much they liked it (pros/cons), and if there are any photos I could see. I understand that in the perfect world I should just use the appropriate K3 lens, but unless I strike oil...those will have to wait. What I do have is enough in the bank to buy the adapter. I figure I can use the lens' I have and save, save, save up for the perfect scenarios unless this adapter is not a good idea and I should avoid it because it'll ruin my K3. Your help and advice is very much appreciated.

02-10-2014, 02:37 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,595	Here's the adapter: Pentax-K Adapter for 645 Reviews - Pentax K-mount Teleconverters and Adapters - Pentax Lens Reviews & Lens Database It's literally just a hollow tube without linkages for the aperture coupler. It isn't available new anymore I don't think. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

02-10-2014, 02:52 PM	#6
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,595	Originally posted by JDelaware Whoa Nelly, that's a giant price difference! Is it because one is Mamiya and the other is Pentax? It's because the genuine product is always a lot more Does the fotodiox adapter have the aperture coupler? If not, then adapted lenses would work like Takumars. Here's the guide to using/metering with manual lenses: https://www.pentaxforums.com/forums/54-pentax-lens-articles/110657-how-use-me...k-x-k-7-a.html Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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02-10-2014, 02:41 PM	#3
JDelaware New Member Join Date: Feb 2014 Posts: 19 Original Poster	Originally posted by Adam Here's the adapter: Pentax-K Adapter for 645 Reviews - Pentax K-mount Teleconverters and Adapters - Pentax Lens Reviews & Lens Database It's literally just a hollow tube without linkages for the aperture coupler. It isn't available new anymore I don't think. I believe you are correct Adam. The adapter would be an old "new" purchase. I just feel dumb having all of these lens' I've never used just sitting there and when I found out I could hook it up to my new camera, I was very excited. My biggest concern is, I don't want to mess up my K3.

02-10-2014, 02:44 PM	#4
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,475	The Pentax adapter is rather expensive for what it does. PentaxWebstore.com:Adapter K for 645 Lenses (645 to 35mm) Adapter K for 645 Lenses (645 to 35mm) The FotodioX adapter is more reasonable. 645 to k adapter \| B&H Photo Video The cons to adapting a 645 lens to K are 645 lenses are larger than K lenses, there is no camera aperture control or autofocus (stop down metering only), and 645 lenses tend to cost more than K lenses. But if you already have a 645 lens there is no inherent danger to the K-3 using an adapter (other than ingress of water, the adapter isn't WR).

02-10-2014, 02:49 PM	#5
JDelaware New Member Join Date: Feb 2014 Posts: 19 Original Poster	Whoa Nelly, that's a giant price difference! Is it because one is Mamiya and the other is Pentax?

02-10-2014, 03:00 PM	#7
JDelaware New Member Join Date: Feb 2014 Posts: 19 Original Poster	Ooo, thank you for that Adam!

02-10-2014, 03:10 PM	#8
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,475	I didn't even notice that it was Mamiya 645... There was a long thread about adapting non-K-mount lenses to K-mount. https://www.pentaxforums.com/forums/22-pentax-camera-field-accessories/96884-...sions-lba.html There are also plenty of 645 adapters on evilBay, both genuine and third party. pentax 645 to k mount \| eBay

02-10-2014, 07:41 PM	#10
Ole Administrator Join Date: Sep 2006 Location: Copenhagen, Denmark Photos: Gallery \| Albums Posts: 4,408	Originally posted by JDelaware Whoa Nelly, that's a giant price difference! Is it because one is Mamiya and the other is Pentax? That adapter is unfortunately for Mamiya lenses, not for Pentax 645 lenses.

02-11-2014, 08:00 AM	#11
LennyBloke Pentaxian Join Date: Aug 2008 Location: Worcestershire, UK Photos: Gallery Posts: 677	Having owned a 3rd party 645 to K adapter and the Pentax original version I would highly recommend going for the Pentax. The 3rd party version I had did the job, but was a bit clunky and not particularly smooth, the Pentax version is beautifully made and all the bayonets fit beautifully against each other. This may not be the experience everyone has with a non-Pentax copy, but for me the difference in price is worth it

02-14-2014, 07:37 AM	#12
RAART Veteran Member Join Date: Apr 2013 Location: Oakville, ON Photos: Gallery Posts: 1,095	I have that Mamiya 645 adapter and is very good one, but it let you focus past infinity. I was assuming that OP had in his mind Mamiya adapter while I do not know if Pentax has "N" lenses like Mamiya does and he mention 645 N adapter... On the mflenses forum there is user with name IGOR that uses 645 Mamiya's on Pentax DSLR but he used them also on Nikon D800 or Canon cameras and does not matter which camera he uses the results are fantastic. I always loved those lenses and their rendering and while they affordable now I started getting them. The first one I got is Mamiya Sekor C 210mm F4 and LBA syndrome struck again... Mamiya Sekor C 210mm f4 Mamiya Sekor C 150mm f2.8 Mamiya Sekor C 150mm f3.5 N Mamiya Sekor C 110mm f2.8 YMMV!

02-14-2014, 07:55 AM	#13
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,475	Originally posted by RAART I have that Mamiya 645 adapter and is very good one, but it let you focus past infinity. I was assuming that OP had in his mind Mamiya adapter while I do not know if Pentax has "N" lenses like Mamiya does and he mention 645 N adapter... On the mflenses forum there is user with name IGOR that uses 645 Mamiya's on Pentax DSLR but he used them also on Nikon D800 or Canon cameras and does not matter which camera he uses the results are fantastic. I always loved those lenses and their rendering and while they affordable now I started getting them. The first one I got is Mamiya Sekor C 210mm F4 and LBA syndrome struck again... Mamiya Sekor C 210mm f4 Mamiya Sekor C 150mm f2.8 Mamiya Sekor C 150mm f3.5 N Mamiya Sekor C 110mm f2.8 YMMV! The OP was not looking for a Mamiya adapter. The 645N was an upgrade to the original Pentax 645 and uses the same mount, but with autofocus. https://www.pentaxforums.com/forums/53-pentax-dslr-camera-articles/110932-pen...-compared.html

02-14-2014, 08:06 AM	#14
RAART Veteran Member Join Date: Apr 2013 Location: Oakville, ON Photos: Gallery Posts: 1,095	Sorry my mistake... I was going out strictly from manual focus lenses point and never thought that someone will use AF lens on Fotodiox adapters that does not support AF. Thank you for amending me!

02-14-2014, 05:06 PM	#15
JDelaware New Member Join Date: Feb 2014 Posts: 19 Original Poster	Originally posted by Bleeblee I bought a 645D and SO wanted to love it. It takes amazing photos, but truth be told, me thinks I'm not a good enough photographer to utilize its awesomeness. I'm thinking of selling it (Anyone interested? It's mint : ) ... but the lenses? Forget it... Those I'm keeping! They are tack sharp on my k5ii. I have a Pentax 645-k mount adapter. It's straightforward to install onto the camera, then I just pop the 645 lenses on. The macro is spectacular, and the wider lenses somehow render shots with a 3D feel. The lenses are heavy buggers though, but worth it for the yummy snaps! BleeBlee, thank you for the snaps! I have decided to make the purchase for the adapter. I'm sure if it doesn't work out, I'll be back here looking for pointers. I appreciate all of your feedback, and as soon as my new K3 arrives I will snap, snap, snap and upload for you all.