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By Richard Shaw
I acquired a second hand Coronado PST. The focus knob doesn't seem to have any effect on the image and, although it turns, it feels as if something inside the scope is "slipping".
Is it worth opening up and taking a look to see the focus knob in action?
Is there anywhere that services the PST without sending it outside the UK?
Are there any nasty surprises if I open it up (springs, pressure points etc)?
I recently acquired a PST and had my first light today...it took a bit of work but I was able to see some great stuff through the EP. However, when I tried to hook up my smartphone to the scope with a phone adaptor I was completely unsuccessful in capturing any good photos. Everything looked way out of focus and I couldn't come close to seeing any of the prominences on the phone that I saw visually. Is this due to the PST's setup? Or am I doing something wrong? I was attempting to do it with an 8mm EP.
I have the following for sale, originally bought for a full PST mod that was never done:
Coronado PST - £430. Boxed.
Vixen A80M - £150. Includes tubes rings, dovetail and focuser but no box, finder or diagonal. SOLD.
90 mm D-ERF - £200. SOLD.
Filter holder - £8. Homemade and bought off a SGL member. Fits the 90mm D-ERF and has a internal diameter of 105mm the other end. SOLD
Solar Finder - £15. SOLD.
WO Dielectric Diagonal D-DIG2 - £35. Boxed. Bought to be used on the Vixen before the scope was modded. SOLD.
All are in excellent condition and do not include postage. Collection preferred for the scopes.
I've now got all of the parts incoming for my 100mm PST Stage 1 mod. So got cracking on dismantling my trusty PST.....
I just can't seem to shift the Etalon & Tuner from the gold tube! I know that others have encountered this problem. Any hints about how to get it moving?
Ever since looking through Stu's PST Stage 1 Mod at the DIY Peak Star Party. I've been keeping an eye out for a suitable donor scope for my own project. Damn you Stu. He's (removed word) done it again! The man should have a wallet health warning hung round his neck??
Nothing has appeared on the classifieds / ABS / Auction site. So, I am thinking that I may have to go cheap and new.
100mm f10 seems to be the sweet spot. Most 90mm f10 scopes seem to come with 1.25" focuses and a plasticy feel (Neither desirable). By the time I have added the requisite 2" focuser. I may as well pay for a 100mm with the 2" focuser as standard. Much reading has thrown up two possibles:
The price is similar for just the OTA.
Which would be better? Or, is there anything else that would work better without baking the bank?