Quote:
Originally Posted by Cam
I purchased mounted 127mm 700mm glass from Surplus shed. Had a mate who had a tube from an old reflector that will fit if I machine the threads off the cell. Im starting off with a focuser I got for free that came off a 60mm Meade refractor to test the glass. If its ok I will spring for a moonlite or sim. What Im worried about is cutting the tube length. Where do I have the focuser tube when measuring? in? out? half way? Do I allow for the diagonal? if so how much? Hope someone can take the time to advise. Thanks Cam
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Hi Cam;
You might have to recut the tube when fitting a 2 inch focuser & diagonal, you can measure the focuser length and a 2 inch diagonal will add another 80 to 100mm that will need removing;
"
Last column is light path length added by diagonal in millimeter.
added = 222 - raw + offset
Code:
raw(mm) Diagonal-name size(inch) offset added(mm)
222.0 no-diagonal 2.00 0.0 0.0
114.5 WO 2.00 0.0 107.5
112.0 OPT 2.00 0.0 110.0
115.5 TAK 2.00 0.0 106.5
118.0 AP-MaxBright 2.00 0.0 104.0
109.0 Baader Mirror 2.00 0.0 113.0
156.0 Baader-T2*1 1.25 8.5 74.5
147.5 Baader-Amici*1 1.25 8.5 83.0
109.0 TV-Everbrite*2 1.25 8.5 121.5"
http://www.cloudynights.com/ubbthrea...2/Main/3313600
Cheers; Jules