Re: [APML] Using Teleconverter

["Bobby Middleton" <bobm@koyote.com>]

Vignetting will be more severe. The f ratio will be doubled. But it still
might make for decent images; depends on the TC.

Bobby Middleton
http://www.koyote.com/users/bobm/astro1.htm
----- Original Message -----
From: Chris Picking <picking@zfree.co.nz>
To: <astro-photo@seds.org>
Sent: Thursday, June 08, 2000 9:01 PM
Subject: [APML] Using Teleconverter


> Hi all,
>
> What kind of effect can I expect from using a 2 x teleconverter when piggy
backing
> with a 50mm or 135mm camera lens, I would expect that exposures would need
to
> be longer. Someone told me the f stop would be increased but I can't
remember
> what the formula was.
>
> I'll be using Fuji 800 film. I'd like to try the Kodak Supra but it seems
unheard
> of in this part of the world !
>
> Thanks
>
> Chris
>
>
> View astrophotography images from the Southern Hemisphere at
>  chrispicking.homestead.com
>
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