Quote:
   | Originally Posted by FiscusFish That 170-500 also has a correction factor of 1.5 to be applied because of the the 400s smaller sensor doesn't it?  That means you be getting a 250-750 zoom (1.5 correction?).  That's piggin' huge...  You'd have to be using a tripod to be getting anywhere near sharp pictures, which takes away the spontaneity a little.  Lot of money to be spending if you get a real high proportion of blurry shots...  
 Modern tele-converters are supposed to be real good and would have to be a lot cheaper, plus lighter.  Just a thought...
 
 Darren
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   Is the correction factor of 1.5 only applicable to the lenses that were on the old camera ? or is that EF lenses and should I be looking for EFS lenses  to get the best results ? 
 What is the difference between EF & EFS lenses
  
  Last edited by YMFB : 27-Nov-2006 at 19:32.