There are many considerations, not least weight. My first concern is to produce a prototype and support the lens via a video support arm.
I have been trawling the E.Bay lens adapters site, and there are several metal adapters that I am looking at, not least the type that fits to the dslr body with an internal thread, primarily to attach a lens reversed for macro.
I am anticipating that a clever mate will produce a tube with that thread to connect.
There is also available a 645 Pentax to Canon fitting. I am wondering if the Canon fitting can be substituted with a Pentax type. Any thoughts??
Presumably, the makers will have made the fitting tha correct length for Infinity focus.
Stefan! You are a star. I was anticipating asking for the very details you have provided.
The clever bit will be to set the 645 lens fitting into the tube at the right length.
A silly question. How can I determine that the fitting gives me infinity focus? I am still trying to work this one out.

Thanks, John. It will help the experiment along. I will willingly pay postage. Will pp you with my address, if that is ok.

thoramay

John. Let's see how I get on. I am presently looking at using a rear lens cover with a pentax body cover.

The technical side is somewhat beyond me. There are issues with focus to infinity and getting the flange distances at the correct distance.

Waiting to find a rear 645 pentax lens cap. If you know of a source it would help the process through.

Will proceed as stated in the other Forum but leave the opportunity to fit a distance piece between the two parts to achieve correct focus.

With me it is trial and error. No technical know how.

thoramay

I have since discovered several interesting articles in that other pentax forum for making a simple home made adapter from a 645 lens cap and a 35mm body cap and utilising an extension tube to add distance.

Another method used the end fitting from a redundant 35mm lens and a plasic pipe distance piece and then glued into a 645 lens end cap. These were for Mamiya lenses.

But! It all requires a little know how. The distance between the two flanges is critical for infinity focus.

Any clever member able to help with that measurement for Pentax lenses, please.

Interested. Go to DIY Mamiya-SekorM645-to-PK-adapter-pentaxforums.com


thoramay.

just a punt to see if there is a redundand adapter lying in a camera bag. Must be reasonable, price that is.

thoramay

Thanks, John. Had actually looked at this site previosly. Was confused by the A* rating and assumed it was an A lens.
Will go looking some more. Appreciate your help, people.

regards thoramay.

Sorry, fellas. Did not put 645 in the title, It is the 645 lens I am trying to trace. Fforbed has two for sale but cannot find anything beyond that. I have purchased this lens from USA in error and need to establish whether it has the correct description.

regards thoramay.

Searching for details of this lens. E.Bay do not recognise this lens. Tells me it should be EF or FA.
Does anyone use this lens.

regaards Thoramay

Try asking 'Matsuiyastore' They seem to have a very good reputation for finding Pentax lens. They have several interesting Pentax lens on this site. Will search for your wants, apparently. Might be worth a try. They probably give you some idea of what the cost could be.
Thoramay

Not thinking about it, George. Perhaps temptation has got you thinking....How much???

and if you have any notion about trainiing a kingfisher...I know it takes at least ten years.

thoramay.