A few words on Equivalence and comparing systems

Started Apr 2, 2013 | Discussions thread
OP Great Bustard Forum Pro • Posts: 40,694
Re: A few words on Equivalence and comparing systems

gollywop wrote:

A very nice, concise summary, GB.  I think I'll have to include a link to it in my 4th End Note.  Then we'll have links to ISO/Read Noise, Pixel Counts, and Cross-Format Equivalence.

My only comment is in regard to

Great Bustard wrote:

  • The photos all have the same motion blur and the same total amount of light falls on the sensor when the aperture diameter and shutter speed are the same (e.g. ISO 100 on mFT and ISO 400 on FF).

In relation to all that comes both before and after, I suspect to those who haven't been through all this before, the introduction of ISOs, particularly with an "e.g.", will seem rather out-of-the-blue and be a bit of a mystery.  Perhaps some small explanation is in order.

A "small explanation" is indeed in order.  I believe you will find it here:


But, overall, a very lovely job.

Thank you, kindly!

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