Hasselblad Whatsit

<p>I've had this kicking around in a drawer for years without a clue as to what it is. I'm sure someone here will know. It is a chromed adapter ring that that fits a Bay 50 lens. It has an anodized black insert that is marked "H.B-50" and "Japan". The insert has a threaded hole of about 27mm. Very nicely machined and finished. Any ideas?</p>

<p>It would be helpful to post a photograph unless you did and I'm not seeing it. Does that insert screw out and is a separate ring? Again, a photo might help get you an answer more quickly.</p>

<p>Fair enough. The back just has the standard Bay 50 bayonet prongs.</p><div></div>

<p>Sorry, I'm at a loss on this one. Perhaps someone else knows. You may want to repost it with the photo this time and someone will know.</p>

This could be for mounting macro lenses similar to the Luminar. I forget what the Luminar's diameter is, but there probably are competing

lenses that this may have been designed for.

<p>Taras, that was probably my thought when I first saw this years ago. Then, I realized that it attaches to the front of a lens, so you would be putting one lens in front of another. I have done this with 35mm in the past, putting a short lens face to face with a longer lens for macro work but I don't think this would work out in this case. I'm wondering now if it is to mount the camera and lens to a microscope or telescope for afocal work.</p>