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Old 19-08-2008, 08:16 AM
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Liz
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Join Date: Aug 2007
Location: Beautiful SE Tassie
Posts: 4,734
Inner focusing system

Hi all

Looking at buying another 'longer' lens for 450D, as are quite a few others by the looks .... alas budget wont make it for the L series, but seem to be a few around for about $500. Some lens are quoting an inner focusing system, would this suit astrophotography?? (camera on tripod setup) Dont you need to focus?
This is an example
http://cgi.ebay.com.au/Sigma-28-300m...QQcmdZViewItem

Have searched on IIS, and some some good data already, but this focusing thing had me wondering.



Thanks in advance.
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