Cropping factor/multiplier factor?


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ptm

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Feb 28, 2002
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#1
Hi All

Can anybody tell me when is cropping factor considered or taken into considerations?
Hehe...all I know is that it's use for calculating the focal length of a lens when it's use on a dslr.
This is my understanding, please correct me if I'm wrong.
For a 28-90 mm lens, when use on a dslr, it becomes, 45 (28*1.6) - 144 (90*1.6).
 

Bluestrike

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#2
ptm said:
Hi All

Can anybody tell me when is cropping factor considered or taken into considerations?
Hehe...all I know is that it's use for calculating the focal length of a lens when it's use on a dslr.
This is my understanding, please correct me if I'm wrong.
For a 28-90 mm lens, when use on a dslr, it becomes, 45 (28*1.6) - 144 (90*1.6).
Yes it something like that. It oso known as the focal length multiplier or FLM for short.

It because of the different in sizes of the CCD/CMOS that give birth to FLM.
For more info look here
http://www.dpreview.com/learn/Glossary/Optical/Focal_length_multiplier_01.htm
Note oso that the FLM varies from brand to brand!
 

ptm

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thanks for the link ;)
didn't know that the perspective will be different too.
in photography sense, is this FLM good or bad, or rather what are the pros and cons?
 

noobee

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ptm said:
didn't know that the perspective will be different too.
ummmm, i think the perspective remains the same.
 

ptm

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noobee said:
ummmm, i think the perspective remains the same.
ooops, sorry...yes the perspective remains the same, got mixed up by "links jumping" ;p
it changes when different focal length lens are used, eg. between a 28mm and 78mm.
 

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