| Author | Thread |
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06/02/2005 12:11:49 PM · #1 |
Here are the PDR ratings of a few Canon lens
142 PDRs - 70-200mm f/2.8 IS
8 PDRs - 18-55mm Kit Lens
35 PDRs - Canon EF 50mm f/1.4 USM
142 PDRs - Canon EF 100-400mm f/4.5-5.6L IS
48 PDRs - Canon EF 28-135mm F/3.5-5.6 IS USM
300 PDRs - Canon EF 600mm f/4.0L IS USM
Formula for calculating PDR for rating lenses
PDR = (max zoom / f-stop) * M
Where M = Multiplier:
IS* = 2.0
USM* = 1.0
L* = 1.0
Standard = 0.8
* or brand equivalent
Message edited by author 2005-06-02 12:14:29. |
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06/02/2005 12:18:05 PM · #2 |
What is this supposed to tell us about the lens??
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06/02/2005 12:24:59 PM · #3 |
Purchase Decision Rating. I think thats what it is. The higher the number meaning the better it is and the pricer it is too.
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06/02/2005 12:25:33 PM · #4 |
Originally posted by kirbic:
What is this supposed to tell us about the lens?? |
He's still trying to figure that one out himself. 
Does tell a lot about someone that was bored though. LOL
(j/k Jason) |
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06/02/2005 12:30:37 PM · #5 |
Brad where is that awesome 1MP camera of yours?
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06/02/2005 02:40:40 PM · #6 |
The answer for what a PDR is can be found in the HP (Horsepower) thread...
;) |
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