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03/20/2005 07:58:29 PM · #1 |
I was putzing around on the net looking for a new lens, and I kept seeing things about a "conversion factor"...for example
"Equivalent in 35mm format to 93.5-340mm range after 1.7x conversion factor."
what does that even mean...is that something practical you can change in camera or something?
Mark |
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03/20/2005 08:06:58 PM · #2 |
The conversion factor is just another way of saying "crop factor". That's what the effect of using a lens meant for a 24mm x 36mm sensor or film on a camera with a smaller sensor. For example, the 300D has a sensor that's about 15.7mm x 22.3mm (1.6 crop factor). Multiply actual focal length of the lens by the crop factor to get the focal length that the lens will "feel like" on your cam.
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03/21/2005 06:29:07 PM · #3 |
Here's a page with a good explaination.
//www.dpreview.com/learn/?/Glossary/Optical/Focal_Length_Multiplier_01.htm |
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