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Understanding lenses	angybone (7684)	::	2007-08-25 16:12
Olympus is announcing a new lens coming out next month...it's 70-300mm. Now on the blurb it explains that this is equivalent to 140-600mm in 35mm focal length. Why is this different? What does that mean? Now if I buy this, how far away from the subject will I be able to be and still capture a decent shot. I'm using a 40-150mm now and according the write-ups about it, it's not equal to anything different in 35mm focal length. I wish I understood all this. Can somebody simplify what all that means for me? Thanks! Angelina
Re: Understanding lenses	SunToucher (11162)	::	2007-08-26 4:21
Angelina, The Olympus uses a smaller sensor (APC) then 35mm film. Meaning that the image captured is two times smaller then that it would be of a 35mm film. Lenses are still calculated in mm focus compared to 35mm film. That is why a 70-300mm lens is actually a 160-600mm lens. This means that you have a less wide angle but a large zoom. The shortest distance of focus will be indicated on the spec of the lens. Also you 40-150mm is actually a 80-300mm zoom for your Olympus. Every lenght of a lens you buy for your Olympus needs to multiplied by two. For Nikon APC sensors this is 1.5 crop factor and for Canon APC sensors this is 1.6 crop factor. I hope this makes sense. Niek

Forums: Photography