Ian I went the 2 " focuser as I had a 2" Clement focuser from my old scope.It gives a 1 " low profile no obstruction into the tube but a 3" travel.Downside big and bulky and a tad heavy but it does not slip.The diagonal is 79mm which gives about a 24mm fully illuminated field.It's a bit under a DSLR chip diagonal but at the time funs didn't permit buying a 3" focuser to allow for more unvignetted light.I was toying up with getting a 3" Clement focuser.There is also one available from Jims Mobile JMI.
Yep the ASA reducer is very expensive almost as much as the Mirror but is made with an ED element. I have been hoping to upgrade my mount as well but thats an even bigger leap of $$$ as I have a 14.5" f3.5 on my mind.
My tube is called a Blacklite tube from where I got the diagonal FPI Protostar.It's preflocked saved a bit of messing around.
http://www.fpi-protostar.com/blite.htm
She's dark inside there.I experimeted with a green laser pointer at different angles on different materials looking for a flock material and this stuff they use on the inside shows no reflections or light scatter.
So far I am getting very good results from the MPCC at F3.8 which does make it hard to justify the ASA corrector reducer.
Mark
Quote:
Originally Posted by Ian Robinson
Nice rig....
I'm not far off finishing my 10" f4.66 (which will be used visually and to image via my Lumicon coma corrector and esyguider) and will be put ontop of my New Atlux (looking forward to trying it out at last , I've had it for over 12 months and not taken it out of the house yet ....).
I too looked at buying one of those 2" 0,76x ASA correctors
http://www.astrosysteme.at/eng/correctors.html
but they are PRICEY .... I'll make do with the Lumicon coma corrector and my Baader MFCC for imaging and my Paracorr Visual for when I'm just looking.
Once my OTA is complete (maybe in a day or two) , and I've boned up on driving the Starbook controller , I'll have some fun trying it all out this dark ..... bet the drought breaks and all I see is clouds !!!
Then it's onto getting serious about the ROR shed (umm.... observatory) .... might be all set up by Xmas maybe.
If the long range weather forecast for Qld and NSW is wrong and it clouds up and gets very wet over the next few months .... blame me if it's not because of Mark's new kit.
Mark , how big is your secondary ?
I take you have a 2" low profile crayford focusor too , or did you opt for a 3" low profile crayford (assuming they are available) ??
Did you flock the inside of your tube ?
I just completed flocking mine last week and have been static testing the adhesion of the flock to make sure it stays put before installing my optics. |