This has been discussed many times, I guess...
How the crop factor (and lens focal length equivalence) should be calculated?
As far as I know to get the crop factor one should divide the sensor dimensions (either width, heigth or diagonal). The crop factor can be then used to calculate the equivalent lens focal length (by simple multiplication/division).
However, yesterday I tried the Panavision site:
http://www.panavision.co.nz/main/kbase/reference/tblelenseqvform.asp
to calculate the lens equivalence between various 35mm formats and 2/3'' sensor and I got strange results. According to Panavision the crop factor between these two formats is ~2 (same for 35mm to 16mm conversion). I've always thought that it should be ~4. I'm confused.
How the crop factor (and lens focal length equivalence) should be calculated?
As far as I know to get the crop factor one should divide the sensor dimensions (either width, heigth or diagonal). The crop factor can be then used to calculate the equivalent lens focal length (by simple multiplication/division).
However, yesterday I tried the Panavision site:
http://www.panavision.co.nz/main/kbase/reference/tblelenseqvform.asp
to calculate the lens equivalence between various 35mm formats and 2/3'' sensor and I got strange results. According to Panavision the crop factor between these two formats is ~2 (same for 35mm to 16mm conversion). I've always thought that it should be ~4. I'm confused.