Re: [APML] teleconverter lens questions

[AikeM.Voelker-Jamin@t-online.de (AikeM.Voelker)]

Hi Alan,

teleconverters will dublicate the focal lenght of the lens you are using. 
However they will reduce the "speed" of the lens by 1 stop. I once bought a 
cheap "no name" teleconverter and after the first use, I've never used it again, 
because of poor image quality. I am sure others on the list will have a more 
detailed and precise reply to your question, but I thought it was worth 
sharing:-)

Clear Skies,

Aike
www.astrophotography.de

Alan Voetsch schrieb:
> Hey list,
>
> I need some info on teleconverters. I'm not familiar with them, so be
> patient. My questions are: what do they do and under what conditions would
> they be used. Also if used what are the advantages and disadvantages.
>
> FYI, my setup is an OM1 with a 50mm f/1.4 and 135 f/2.8. I also use a
> pro-optic 500mm f5.6 with a 350mm f/4 converter.
>
> Many thanks in advance,
> Alan
>
>
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