Re: [APML] Horsehead and Pleiades testshots with 6x9 camera/OAGand BRC

[Gene Horr <genehorr@texas.net>]

> How do you measure star diameters on negatives? I tried with a measuring
> microscope, but could not get consistent results

Apparently the same thing.  I borrowed a microscope that has an EP with a
reticle with measuring marks.  You count the ticks then look up the scale
at whatever power you are at.  It had a very high price tag and the owner
claimed high accuracy, but I can't vouch for that myself.  I can still go
back and test the instrument, but how would one do that?

Gene Horr
genehorr@texas.net

--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>