bobandcar
No longer a newbie, moving up!
- Joined
- Dec 18, 2011
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- 451
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- Newark, Delaware, USA
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I currently own a canon 70-300 IS lens that is f5.6(f8is better) when I use it at 300mm.
The question is, the canon 300 mm f4 has better light abilities but by how much?
70-300 at 300 f5.6
300 at f4
Now direct stops is easy to calculate but how much actual light am I gaining?
I've heard that length of barrel and number of elements play a factor here also
The question is, the canon 300 mm f4 has better light abilities but by how much?
70-300 at 300 f5.6
300 at f4
Now direct stops is easy to calculate but how much actual light am I gaining?
I've heard that length of barrel and number of elements play a factor here also