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1. Sep 30, 2016

### Andy Resnick

2. Sep 30, 2016

### phinds

question:

I've never heard of crop factor before but I don't follow that math at all. Can you expand on what this means / how it works?

Thanks

3. Sep 30, 2016

### Jonathan Scott

Diagonal of standard 35mm sensor (36mm x 24mm) is approx 43mm, so crop factor 1.6 means sensor diagonal about 43mm/1.6 which is about 27mm diagonal.
https://en.wikipedia.org/wiki/Crop_factor

4. Sep 30, 2016

### phinds

Ah. Got it. Thank you. I do think that the assumption that this is immediately understandable is a bit of a stretch since the article (which is very good) is for beginners so @Andy Resnick, would a beginner be expected to know that 35mm => 35x24 ?

5. Sep 30, 2016

### olivermsun

36x24, and probably not, but it isn't so important to know these exact dimensions as long as you realize that's what people are using as the reference when they say a certain camera/lens has an equivalent zoom range of 28-200 mm or whatever. They mean the field of view covers the same range as a 28-200 mm lens would on a traditional 35 mm format camera.

6. Oct 4, 2016