f stop and crop sensors

Started May 11, 2010 | Discussions thread
Leonard Migliore
Leonard Migliore Forum Pro • Posts: 16,323
No and it's too late

Brivers wrote:

you've actually described what t-stop is, which is the actual amount of light hitting the sensor. Each lens has a different t-stop even having the same, f-stop. fstop is a relational value to the diameter of the diaphragm relative to lens diameter.

The post to which you replied (made in 2010) did not describe T-stop. It discussed, among other things, the effect of keeping the f/stop the same when the sensor size is changed. This is related to the larger topic of equivalence.

T-stops, which are common in video usage, are just f/stops corrected for lens transmission. The poster made no reference to this topic at all.

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Leonard Migliore

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