Relationship LP and Telescope magnitude limit
Posted 25 November 2012 - 06:17 AM
Posted 27 November 2012 - 04:20 AM
Posted 27 November 2012 - 04:41 PM
Posted 27 November 2012 - 09:10 PM
Thanks, certainly of interest - but what I am looking for exactly would be an extension to the formula for calculating the Telescope Limiting Magnitude like for example "TLM=2,7+5*LOG10(D_mm)-f(NELM)".
I'd say that a fair approximation for binoculars is:
BLM = NELM + 2.5*LOG10(mm/7 * mag)
However, this isn't really linear with magnification; it's faster than linear for low magnifications, and magnification becomes almost irrelevant at exit pupils smaller than 1 mm.
Binocular vision is worth about 1/4 magnitude. So subtract 1/4 mag for monocular telescopes.
Posted 28 November 2012 - 11:39 AM