[Only registered members may post.] [Threaded View] [Translate]
Understanding lenses angybone Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 1047 W: 14 N: 2372] (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!
Re: Understanding lenses SunToucher Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2385 W: 237 N: 3033] (11162)::2007-08-26 4:21
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.