3 replies to this topic

[Gert]

Hello All,

The search function for etendue calculator gives a discussion here ob CN from 2019. Is there something new and updated on the www???

Thanks and Clear Skies,
Gert

[triplemon]

Do your refer to the telescope figure of merit that Mel Bartels proposed ? That one is Aperture ^2 * TFOV  ^2, a simple quadratic formula. You really don't need a online calculator for that.

 

There were some discussions since that refine that number a little bit to account more exact light throughput of the scope in https://www.cloudyni...ndue-newtonians

Edited by triplemon, 20 May 2025 - 12:40 PM.

[Starman1]

This is only a little peripheral to the subject:

https://www.cloudyni...hart/?p=7460391

[RetiredDave]

https://lambermont.d...telescopes.html