Brian Carter

I searched 'Pentax K' in the macro forum, and came up with 0 results. Could you clarify your directions, please? Thanks.

Thank you I will look into that.

Thank you. Yes, it is the mount that would be on the camera body. That's why I hedged calling the other side a T-mount - even though it might be missing the bolt part - because the 'socket' side was so wide. It's a 54mm diameter rim. As the pictures show it's quite large compared to the mount. I don't know of any T's this size. and it doesn't make sense to have mounts for lenses on both sides of an adapter. My guess now is that it's for mounting lenses on a specialty camera, maybe one that takes lensboards? P.S. Shouldn't I move this thread to the Pentax section? Thanks.

Thank you, John. The mating ring with clamping screws would be on the receiving optics, yes? I think these mounts are for telescopes, large microscopes, CRT displays, lab equipment, etc., not for lenses. But i've never seen one this size before - it appears to fit in a 54mm opening.

Just so I'm not treading water in the wrong forum - can someone please verify that this is a minolta mount? The mount itself looks Minolta, but the moving pin seems to be in a different location. Thanks/ P.S. Is the other side a T-mount, in a different than usual diameter? Is there such a thing?

Thanking you all in advance.... I have wondered about the below pictured small (60 x 69 x 22mm) modular flash bracket for a year. Now i'm trying to ease back into photo.net, and the first thing I have is questions. Some nerve. I used to shoot with a Rollei 35S, and I've seen many small cameras - this bracket has no maker ID, but it is well machined and appears to be versatile, but for a specific unusual camera - - It has both plug-in connections, and a pc socket. So it will accommodate a hot shoe connection, or a pc one? - The threaded screw will only work on an extruded socket. (That extrusion needs to fit into the recess around the screw.) - As the screw wheel is turned, small holes in the back of the wheel are revealed through an opening on the camera side of the bracket. Perhaps one of the holes turns into position to receive a spring-loaded pin, to keep the wheel from turning during use? It's the little details like that that kept me interested. Any ideas?

Hmm. I was certain that I had written a reply, telling you that you were spot-on, Dave. And my first premise is wrong, they are for the 2500 after all. I missed the relationship between the thin slot above the SB-4 socket at the base of the 2500, and the circuit 'plug' that extends into the receiving area on the module. Together, it's quite a different look - and it puts variable auto exposure controls on the front of the flash, so you can make easy ratio adjustments from the subject side. All this time - right under my nose. Thank you. My question is fully answered. Ha! You know, I am just now realizing that you are the buyer of these, Dave! Thanks for your help. I'm surprised at how little information is available with a specific search online. I think they might qualify as a real curiosity - a curio? - better than that, at the least. I wonder how many were made? No matter - Time to move on, it's your hobby now. /Cheers

Hello. Among my odd items is this Minolta lens to clamp-on mount. I think it's a MN lens mount - it looks close, but not exact. The other side of the adapter is a grooved rim, of the kind that would accept screw clamps. Clearly I am ignorant of just about everything about this adapter. Does anyone recognize it? Thank you/

Thanks all for the contributions, I needed to pick up my meter and I needed a moment from crisis for hobby stuff. Turns out the negative probe on my meter has a hard plastic sheath around the tip, leaving just a pinpoint. Fine for detail work, not so much for tight spaces. It does not fit into the outside shoe slots, to reach the metal contact there. I got some readings using the positive probe in the pc hole, and tripping the flash. The range of 13.9v to 4.9v that i got fits with the 14.1 shown on the dpanswers website voltage list for the Vivitar 2500 i was measuring. Unfortunately, by the time i (later) put my mystery adapter on the same 2500, my meter had stopped reading anything. The display shows strong visible zeros, but never budges from that. Maybe I blew out a probe? Whatever, I will need to have a functioning tester - this one says every battery in the house is dead... ;-) I'll get back to you. Even if these things prove to be voltage reducers, it doesn't answer how they came to be. If home or shop made, the assembly quality is high. I'll try taking one apart. Thanks again/ P.S. I read that reverse polarity is not at all good for digital slrs - not sure if it makes a difference in the mechanical cameras, or old TTL systems.

You are correct re the purchase of a box of accessories, but that's it. Let me help you ;-) The Vivitar dedicated modules are part of the body of a particular line of flash units. They each contain the necessary hot shoe contacts for a particular camera line, and they also include the auto control sensor. Instead of receiving a hot shoe, they clip onto the bottom of a flash head. The larger connection area allowed for multiple contact points, allowing more information and functions. The Vivitar DM/ modules (DM/O, P, N, M, C..) are used with their 3000 & 4000 series flashes (not all of them). The PM/ series is used with their 5000 series flashes. Having never seen the DA/ modules before, I spent the usual 15 mins on Google before I asked questions. The result was 2 references to using them with the '2500 series' flashes. I don't know what that is, seeing as how the 2500 flash (my first picture), doesn't even take modules. So...Still a mystery to me... but a touch more complex than first impressions might imply.

No, it's not the 2500 Thyristor flash. That doesn't accept modules. I've attached photos of the modules, and a 2500 flash. The numbering is not very convenient. Thanks/Brian

Thanks. I've googled voltage reducers, and I only find the Wein model. If not, what are they?

Anyone know what this Fuji accessory is used for? Thank you/Brian