Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: ApophisAstros on Apr 03, 2017, 15:08:11

Title: First Quarter Moon through scope
Post by: ApophisAstros on Apr 03, 2017, 15:08:11
(http://gallery.orpington-astronomy.org.uk/albums/userpics/10062/MoonOAS.jpg)
http://gallery.orpington-astronomy.org.uk/albums/userpics/10062/MoonOAS.jpg.jpg

This is a single shot taken with Canon EOS 750D with SKYWATCHER-120ED DS-PRO
120MM (4.75") F/900 ED APOCHROMATIC REFRACTOR TELESCOPE WITH A .8 X Focal Reducer but next time i will take a few and stack, or HD video perhaps.
Seems to be coming together , Polar aligning , guiding , focusing , power supplies....plus plus
Roger
Title: Re: First Quarter Moon through scope
Post by: Carole on Apr 03, 2017, 15:42:01
You're going great guns Roger.  This would have been good if the focus had been a bit better.

At infinity everything is the same focus, so you can focus on a star - lock the focus and then come back to the Moon using the same focus.

Don't suppose you have acquired your Bahtinov mask yet though.  Not expensive. 
this is the guy I bought my BM from for the 120P and he also does the red plexi glass you were after. 

http://www.morris-engraving.co.uk/starsharp.htm
He actually makes them and sells them on Ebay. 

You need to get the right one for your scope. 

I think you need this one:
http://www.ebay.co.uk/itm/Bahtinov-Focus-Mask-for-Skywatcher-Evostar-120-refractor-/292074401481?hash=item4400fdaec9:m:mRZXBPW4MKMcwnJaSD9E_Jg

Carole
Title: Re: First Quarter Moon through scope
Post by: Carole on Apr 03, 2017, 16:03:39
While you are waiting for the Bahtinov, there are two other types of mask you can make easily, a Y shaped mask which works in a similar way to the Bahtinov (spoke needs to be in the centre).

Or a Hartmann's mask. 
http://timtrott.co.uk/hartmann-mask/

Or this if you can read it:
https://stargazerslounge.com/topic/216040-hartmann-mask/

Carole
Title: Re: First Quarter Moon through scope
Post by: MarkS on Apr 03, 2017, 21:31:11
Nicely exposed but as Carole says, you need to nail the focus.

Mark