MYO (Make Your Own) 645 to K Adapter

bodhi08 · 06-29-2010, 11:35 AM

I am not sure if this is the right place to ask but here goes.

I have seen pics of a 645 to K adapter that someone made him/herself on pentaxforum but I am not sure how to find those pics again.

I have been looking for these adapters (original Pentax if possible) at reasonable price (USD 200 or thereabout is not what I considered reasonable

).

Has anyone made their own adapter?
Could you please provide step-by-step instructions?
Pics would really help.

cheers

Adam · 06-29-2010, 12:04 PM

It might be in our DIY section, here: Do-It-Yourself - PentaxForums.com

bodhi08 · 07-01-2010, 02:08 AM

Thanks Adam, but it's not in that section.

I dont think it was a thread by itself but rather a post in a thread about something else.
Not exactly step-by-step instructions but a pic of an adapter that he made.

cheers

bannor75 · 07-10-2010, 02:41 AM

A quick and very cheap adapter can be made from a m42 3 part extender and a 645 lens cap and a m42 body adapter.
Use the 10mm extender connected into the m42 adapter. Fit to canera.
Cut a section from another part of the extender to leave a 42mm thread with a flange.
Cut a hole in the cap to contain the flange and thread through cap into the other end of the 10mm adapter. Screw up tight. It works. Not sure yet if the 10mm extender gives the right distance to shoot to infinity.
Register distance for K mount is 45.46
Register distance for 645 is 70.87.
Difference is 25.41. Equivilent to an imperial inch.
The 10mm extender plus the cap is about this.

I have only just made this adapter and not tested it fully.
Maybe better DIY experts can help.

bodhi08 · 07-19-2010, 01:09 AM

Thanks bannor75.

Since then I have considered getting one on ebay from Hongkong / China for about USD 100.

Has anyone tried this conventer?
How does it compare to the real thing?

thanks

bannor75 · 07-20-2010, 01:27 PM

The diy adapter works really well. It really depends how much you intend to use this. If regularly, then, yes, there is a Honk Kong made equivelent to Pentax. I have not been able to source. I shall be interested in your conclusions.
I have a 645 Pentax 300mm. and this needs supporting using a video lens holder. I am not ready to invest in shorter lens but am very tempted following my results of the 300mm.
Happy experimenting

06-29-2010, 11:35 AM	#1
bodhi08 Senior Member Join Date: Jan 2009 Location: Perth, Australia Photos: Gallery \| Albums Posts: 180	MYO (Make Your Own) 645 to K Adapter I am not sure if this is the right place to ask but here goes. I have seen pics of a 645 to K adapter that someone made him/herself on pentaxforum but I am not sure how to find those pics again. I have been looking for these adapters (original Pentax if possible) at reasonable price (USD 200 or thereabout is not what I considered reasonable ). Has anyone made their own adapter? Could you please provide step-by-step instructions? Pics would really help. cheers

06-29-2010, 12:04 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,594	It might be in our DIY section, here: Do-It-Yourself - PentaxForums.com 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:

07-20-2010, 01:27 PM	#6
bannor75 Inactive Account Join Date: Apr 2009 Location: isle of wight england Posts: 24	645 to K The diy adapter works really well. It really depends how much you intend to use this. If regularly, then, yes, there is a Honk Kong made equivelent to Pentax. I have not been able to source. I shall be interested in your conclusions. I have a 645 Pentax 300mm. and this needs supporting using a video lens holder. I am not ready to invest in shorter lens but am very tempted following my results of the 300mm. Happy experimenting

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07-01-2010, 02:08 AM	#3
bodhi08 Senior Member Join Date: Jan 2009 Location: Perth, Australia Photos: Gallery \| Albums Posts: 180 Original Poster	Thanks Adam, but it's not in that section. I dont think it was a thread by itself but rather a post in a thread about something else. Not exactly step-by-step instructions but a pic of an adapter that he made. cheers

07-10-2010, 02:41 AM	#4
bannor75 Inactive Account Join Date: Apr 2009 Location: isle of wight england Posts: 24	A quick and very cheap adapter can be made from a m42 3 part extender and a 645 lens cap and a m42 body adapter. Use the 10mm extender connected into the m42 adapter. Fit to canera. Cut a section from another part of the extender to leave a 42mm thread with a flange. Cut a hole in the cap to contain the flange and thread through cap into the other end of the 10mm adapter. Screw up tight. It works. Not sure yet if the 10mm extender gives the right distance to shoot to infinity. Register distance for K mount is 45.46 Register distance for 645 is 70.87. Difference is 25.41. Equivilent to an imperial inch. The 10mm extender plus the cap is about this. I have only just made this adapter and not tested it fully. Maybe better DIY experts can help.

07-19-2010, 01:09 AM	#5
bodhi08 Senior Member Join Date: Jan 2009 Location: Perth, Australia Photos: Gallery \| Albums Posts: 180 Original Poster	Thanks bannor75. Since then I have considered getting one on ebay from Hongkong / China for about USD 100. Has anyone tried this conventer? How does it compare to the real thing? thanks

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