Canon FD adapter

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DerPit
Posts: 18
Joined: Fri Aug 03, 2018 1:17 pm

Canon FD adapter

Post by DerPit » Mon Aug 13, 2018 2:27 pm

Would be great to have - in addition to the EOS adapters - also one for the older FD lenses. I do have some of those (like the 135mm F/2.8) and would love to use them with my ASI1600MM+EFW.

I know there are also FD-to-EOS adapters, but they include an additional lens , and nested adapters are bad for stability....

Konihlav
Posts: 18
Joined: Mon Jun 04, 2018 8:14 am

Re: Canon FD adapter

Post by Konihlav » Tue Aug 14, 2018 3:18 pm

I think that what would make lot more sense for ZWO is to produce a copy of this thing:
https://www.teleskop-express.de/shop/pr ... ktive.html

but a bit improved :-)

that Geoptik thing is great, but still has few issues (from my point of view of an experienced imager).
- It has a small locking nut - my friends solution - see here http://teholagr.blogspot.com/2011/11/ud ... apter.html
is much much more rigid and robust (original idea came from the Geoptik adapter)

- It has big 19mm thickness so it eats 19mm from the BFD that is 44mm for Canon lenses

since for ZWO cameras having typical back focal distance of 26.5mm the 19mm geoptik adapter is unusable.

Hence, if ZWO offers just the front part - EOS lens with contra-locking-nut (making zero tilt of the lens attachment) - and with shorter back focal distance, say no longer than 17mm (ideally 15-16mm because a spacer/washer can always be added to make it longer) then it would be GREAT!

it may need only M54 or M42 classic T-threads on the back side and possibly accommodate 2" internal filter (exactly as geoptik thing does).

easy... such an adapter doesn't exist on the market, AFAIK (the Geoptik is good, but not that perfect as I'd like it to be - shorter without obstructing "leg" that prevents attachment of larger square body cameras)...

just my $0.02 :-)

DerPit
Posts: 18
Joined: Fri Aug 03, 2018 1:17 pm

Re: Canon FD adapter

Post by DerPit » Tue Aug 14, 2018 5:46 pm

Well this is indeed a much more complex thing, and not what I am looking for with this FR.

(ZWO already has an EOS adapter, and I specially want one for FD lenses, not EOS (FD has 42mm BFD). Another EOS adapter doesn't help me anything)

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Support@ZWO
Posts: 787
Joined: Mon Apr 24, 2017 10:08 am

Re: Canon FD adapter

Post by Support@ZWO » Wed Aug 15, 2018 2:11 pm

Will be a lot of people use it?
Location:lon=120.6 lat=31.3
Suzhou China

DerPit
Posts: 18
Joined: Fri Aug 03, 2018 1:17 pm

Re: Canon FD adapter

Post by DerPit » Wed Aug 15, 2018 2:29 pm

I don't really know. If it had existed when I bought my 1600 I would have ordered one together with it for sure.
In our photo community (normal, not astro) there's quite some people using old FD lenses with adapters. I thought as it is a quite simple thing (just T2-ring with a bajonett) it might be easy to set up/build and therefore suggested it.
But I do understand it's likely not high on the priority list ;)

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Support@ZWO
Posts: 787
Joined: Mon Apr 24, 2017 10:08 am

Re: Canon FD adapter

Post by Support@ZWO » Tue Aug 21, 2018 5:43 am

OK, I'm sorry, if we make a product for one or few people, the cost is too high to us.
Location:lon=120.6 lat=31.3
Suzhou China

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