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Forum: Pentax SLR Lens Discussion 08-26-2009, 05:17 AM  
Tamron adaptall mount PK to PKA conversion?
Posted By gjw297
Replies: 16
Views: 16,437
Thanks Alfa75ts, that sounds feasible and has got to be worth a try. I feel slightly embarrassed that I didn't do a bit more research before asking!

It sounds like it would be sensible to approach this in two steps: first make a mount with contacts matched to hard wired AE operation for the aperture range of one of my lenses (e.g. 2.5-22). If this works, I've got enough mounts that I could do it for all the lenses that I need.

However, reproducing the contact PCB as well, to allow automated aperture range detection sounds like a challenge and would ultimately be a proper job. I've got a friend who has access to PCB manufacturing facilities... I think that making a contact connecting the (*) contact to the mount body when the AE aperture position is selected is not insurmountable on the PK mount either. I'll take one apart later and have a look.
Forum: Pentax SLR Lens Discussion 08-26-2009, 12:19 AM  
Tamron adaptall mount PK to PKA conversion?
Posted By gjw297
Replies: 16
Views: 16,437
I appear to have developed a mild form of LBA and in the process have acquired a number of Tamron adaptall (1 and 2) primes, which I get on well with. I've got one PKA mount and several PK mounts for them. Obviously the PKA mount makes the lenses easier to use on my DSLR body and I'd like more of them, but then I have seen what they sell for on ebay!

Looking at the PK/PKA mount adaptors, they appear mechanically fairly similar, but with electrical contacts.

I was toying with the idea of trying to convert a spare PK mount adapter into a PKA one. Before I start dismantling my PKA adaptor, I'd be grateful for any thoughts/pointers on such a conversion? I wondered if anyone on here could enlighten me about how the electronic side of the PKA mount works and if such a conversion might be possible (given access to machine tools and electronic engineering expertise?)

Thanks in advance.
Forum: Pentax SLR Lens Discussion 07-29-2009, 10:36 AM  
Taking apart an SMC M 135/3.5
Posted By gjw297
Replies: 5
Views: 3,589
Got them, thanks. If it's any consolation, the screws on mine are really tight too.
Forum: Pentax SLR Lens Discussion 07-28-2009, 10:04 AM  
Taking apart an SMC M 135/3.5
Posted By gjw297
Replies: 5
Views: 3,589
Hi,

I have recently bought an SMC M 135/3.5 with minor fungus behind the front element with a view to cleaning it up. I have previously removed, cleaned and replaced the front element on a SMC M 50/1.4, following this guide:

Pentax 50mm f/1.4 strip-down instructions

However, the 135 has proved more of a challenge as the front element doesn't appear to be mounted in the same way as on the 50mm lens. I can remove the front ring (the one with the serial number and 'PENTAX SMC written on) with the aid of a rubber cup, but the mount for the front element doesn't have notches for a lens spanner as on the 50mm lens.

I've trawled several forums and Google, but haven't found anything relevant to this specific lens. It wasn't expensive and I have another (mint) copy, so I'm not too worried about damaging it, but would be very grateful if anybody has any useful advice or could point me in the direction of a useful guide or diagram.

Thanks.
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