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Thread started 16 Dec 2006 (Saturday) 11:16
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Prime lens set?

96 posts
Joined Nov 2006
Location: Pasco, Wa.
Dec 16, 2006 11:16 |  #1

Hi all....
Currently I have the following prime lenses and two Canon digital slr bodies:
24mm f2.9
50mm f1.8
90mm f2.8 macro
200mm f2.8(in transist)

What I want to determine is there someway to calculate the distance I need to move to get the same amount of sensor coverage from one lens to another? Same sized sensors in both cameas (Rebel XT digital and 30D)

Example...use 50mm lens on one body and 90mm lens on second body...take shot with 50mm lens and then move back x amount of feet to get same sensor coverage with 90mm lens?

FWIW...I also have a couple of zooms....Sigma f2.8 18-50mm (for general snaps) and a Canon F4L 70-200. I am kinda leaning to selling off the 70-200 and just using the primes. I don't seem to notice the hole between 50mm and 70mm too much, so am thinking of just packing both bodies, one with the 18-50mm zoom and the second with the 200mm for much of my shooting.

Lester ­ Wareham
31,906 posts
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Joined Jul 2005
Location: Hampshire, UK
Dec 16, 2006 12:12 |  #2

Just a linear ratio, you are at 10ft with a 50mm then with the 90mm you will be at 18ft.

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Prime lens set?
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