RE: [APML] (no subject)

["Dan Kaestner" <warriordan@comcast.net>]

Thanks for the reply Ray.
The adaptor has glass in it and seems to work fine with my other lens 24mm &
50mm
Must be the rear element limitation of this particular lens??

Thanks Again
Dan K.

-----Original Message-----
From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org]On
Behalf Of Ray Butler
Sent: Monday, February 14, 2005 5:30 AM
To: Discussion of Film Astrophotography
Subject: Re: [APML] (no subject)


Hi Dan,

As an EOS (film) camera owner I am aware of these adapters, but they
normally need to have a mild built-in teleconverter (about 1.26x) to get
infinity focus. If you only got a plain piece-of-metal ring, it can't
reach infinity. If there is glass in your adapter and it still doesn't
reach infinity, something is wrong and I'd ask for a refund. There are
also physical limitations with the rear elements on some FD lenses,
which mean that they cannot be used with any such adaptor.

As for mechanically hacking the lens, you might be much better off
asking this question in another forum dedicated to Canon stuff or photo
gear in general. E.g here are threads from photo.net:

http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=005ud5
http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=005Rat

Cheers,
Ray "who is keenly aware that 'better ask your question somewhere else'
responses can be irritating to the questioner" Butler.


Dan Kaestner wrote:
> Hi Group,
>
>
>
> I have a question if I may. I don't want to be off topic but I figured
> this would be the place to ask?
>
> I have a Canon 100/200mm f/5.6 Lens.
>
> I purchased the Hama AF/FD EOS adaptor so I could use this lens with my
20D.
>
> With this adaptor the lens doesn't focus well to infinity, seems to be
> good out to about four to five hundred yards!
>
> So, the question is, is there a mechanical way to reset the infinity of
> this lens?
>
>
>
> Any help would be much appreciated
>
> Dan Kaestner
>
>
>
>
> ------------------------------------------------------------------------
>
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--
Dr. Ray Butler (ray.butler@nuigalway.ie || ray@physics.nuigalway.ie)
Lecturer, Dept. of Physics || Computational Astrophysics Laboratory
National University of Ireland, Galway, University Road, Galway, Ireland.
Tel: +353-91-524411 ext. 3788   FAX: +353-91-525700


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