Quote:Assuming I use 25x100 binocs, how many of these objects are visible in mag 4.5 skies?This is 18.5 mag/sq arc secs skies using a skymeter.I assume the fainter galaxies are the hardest hit by light pollution.
First and foremost observing love: naked eye.
Last but not least, telescopes.
And I sometimes dabble with cameras.
A man is a small thing, and the night is very large and full of wonders.
Clear Skies, TonyScopes: Celestron 150mm SCT, ES 102mm refractor, 114mm Newt, Circle T 80mm refractor, Cel./Vix. 60mm refractor "the Brute" EP's: Various and sundry along with barlows WO and ES Dielectric Diagonals Filters: DGM Optics NPB, Orion SkyGlow Filter, color and longpass AstroZap Dew Shield, Vibration Pads etc... AstroPlanner V2.1, SkySafari 4 Plus, Vortex 8X42, 60's 7X35 Binocs Astronomy in the Orange Zone! ...73 de KM5JH...
--Dawg, the Russell "Akita mani yo." Observe everything as you walk. (--Lakota) Celestron Celestar 8 Standard SCT, f10 Celestron C80ED ref., f7.5 Celestron 80mm Wide View ref., f5 Orion 120ST ref., f5 Criterion RV-6 Dynascope, Newt., f8, (c. 1962) Sears Discoverer 60mm ref., f7, (c. 1973) Celestron Ultima DX 10x50 Nikon Action Extreme 10x50 Tasco 7x35 wide
Quote:For what it's worth, I can see stars considerably fainter than 4.5 when my SQM reads 18.5.
Quote:Quote:For what it's worth, I can see stars considerably fainter than 4.5 when my SQM reads 18.5.Here is a link for unihedronhttp://unihedron.com/projects/darksky/NELM2BCalc.html18.5 SQM is 4.4 L.M.You must have exceptionally sensitive eyesight.
Scopes: Meade SN6, 10" Dob, Meade LS6, 5" reflector, 8" reflector, 102GT
Mounts: LXD75 and LXD55
Camera: SBIG 8300M, Baader 7nm Ha, OIII, SII, LRGB
Quote:Quote:Quote:For what it's worth, I can see stars considerably fainter than 4.5 when my SQM reads 18.5.Here is a link for unihedronhttp://unihedron.com/projects/darksky/NELM2BCalc.html18.5 SQM is 4.4 L.M.You must have exceptionally sensitive eyesight. No, I don't think my eyesight is exceptional. Better than some, worse than others. I seen people note stars 1/2 mag fainter than I can see while standing right next to them.I am using averted vision, of course -- really pushing the limit of what I can see.I have no idea what model Unihedron's calculator is following, but it's obviously very conservative.
Quote:What is the LM through a telescope such as 6" refractor?I don't think the LM is the same for a SCT or Newt or MCTwith additional mirror coatings and secondary losses.I'm hoping to see Stephen's Quintet through a 6" achromat.