> >There is a way you can have a screw mount lens lock on K-mount >bodies. It needs a little >machine shop job done on the adapter and the lens. > >Could you expand on that please, Andre? >Thanks > >William Robb
I do have a page explaining it. Somewhere... The information might have been posted on the list, maybe 2 years ago. But I might have taken it from somewhere else. Yes, I think from photo.net. Maybe someone on the list have the reference at hands... But, in two words, you have to drill a little hole through the side of the K-mount adapter in order to hold the adapter in place with a little screw (that will stop against the lens thread). Then you need to drill a little hole in the bottom part of the lens, exactly where the locking pin from a K body wants to get out and lock the lens. This is probably enough for some people, but the "how to" was giving a trick to easily identify the second hole's location. Maybe put some chalk and see where the K-pin's mark stops. It does not really matter if you are 1 or 2 mm off on the "not totally screwed" side (that sounds weird...), but if the hole is too far "inside" the lens, you won't be able to screw the lens enough to meet the hole. I think it should be safe to drill the hole in the lens without dismantling anything. A Dremel with a high-speed bit would do the job easily I guess. I'd like to do it on my SMCT 300/4 but have sold my Dremel to a friend years ago. My repairman could do it though. Especialy good to do on lenses with stiffer focusing rings. When cold outside, you can actually unscrew the lens while focussing. The beauty of it is that you can easily take out the adapter if you have a little screwdriver. Unlike exopyed adapters. Will a lens modified like that loose or gain value? You'll know it when you sell the lens... I wouldn't do it to a mint lens. Andre --
