Originally posted by TDvN57
I have found an adapter for the 645 mount which has a 65mmx1mm female thread mount. Thus a typical 'T2' mount for the 645, although the diameter is somewhat larger than the more popular M42 thread.
See the link here:
M65x1 female thread to Pentax 645 camera mount adapter
Despite the cropped image result, I ordered mine and I gladly accept the reduced image circle just so that I can make use of the 645z's qualities.
If anybody has any suggestions up improve or build on this, please share your thoughts.
..
I ordered a "M65x1 female thread to Pentax 645 camera mount adapter", found in the link above and a "T2 female to M65x1 male thread adapter" from RAFCamera via ebay. They arrived relatively quickly from Belarus to California. I also ordered a 2" T2 nosepiece to go from the T2 to M65x1 adapter to my Meade telescope, from a place called Agena AstroProducts.
When I first put the assembly of adapters on my 645Z the whole thing seemed to turn nicely in the bayonet mount of the camera, but never clicked into place like a lens would. It spun with a bit of friction, then spun free. It would turn about 45 degrees, back and forth, in the camera mount, without locking into place. When I pressed the lens release button to try to remove it, it wouldn't move past whatever was stopping it from turning counter clockwise. I removed the nosepiece and T2 to M65x1 adapter to see if I could see what was preventing the removal of the adapter, but couldn't see anything causing the problem. I applied a moderate amount of force to try to turn it but stopped for fear of damaging the camera.
I contacted RAFCamera and got a reply within an hour. This was the verbal exchange:
"me:
Upon first use of this adapter ring it has locked onto the camera and cannot be removed. Do you have any tips on how to remove it from my Pentax 645Z?
rafcamera:
Hi!
Tight a helicoid bit stronger and use it to turn adapter counterclockwise (don't forget to press a lens release button).
Thank you.
Raf.
me:
Thank you for the quick reply. It should require no more force to remove than a lens, yet it will not turn while pressing the lens release button.
rafcamera:
A lens has much more convenient grip, and lens mounts are made of steel usually (not more soft aluminium alloy like our adapter).
Moreover, we trying to make more strict tolerances, so tension is higher than with native lens usually.
I tested these adapters on my old Pentax 645. May be it is bit worn and allows bit more easy adapter turning.
But you should have no issues removing it anyway. Never had such reports so far. Just don't know what went wrong in your case, sorry.
Please try to apply bit more force.
me:
Again, thank you for the reply. I have been able to remove it, applying much more force than expected. Thank you. When it was on the camera, the adapter would turn approximately 45 degrees freely, as if it were loose. But when turning to remove it, and holding down the lens release button, it would stop and not move until extreme force was applied. I note some anodizing has been removed in the process.
rafcamera:
Our adapters have no stop pins. Looks like you overturned it during installation. Just be more careful next time, or you may damage camera mount. Thank you.
me:
That seems like some critical information not found in the instructions.
rafcamera:
People just turn adapter till a lock click usually, so no special instructions required. Thank you."
I need to use my 645Z next month, so I haven't attempted to put the adapter back on yet, and may never do so.
The point of my post:
Use extreme caution putting any adapter like this on your camera.