Saturday, 25 April 2015

New Life in an old focuser

I tested a replacement focuser for the 110mm unfortunately it doesn't fit due to the 4" fitting on the 110. Having removed the existing I decided to have one more bash at trying to get the darn thing moving. I have the technical diagram for the focuser and decided to adjust the bolts that state should only be adjusted by an engineer. What the heck it's busted so what's the worst I can do. Fix it!!!!!

So 20 minutes later I have a reasonably smooth movement going, readjusted the tension to take the weight of the field flattener and camera. On it went and bingo it worked in both directions. I don't think I want to remove the camera ever again.......


A rebalance of the scopes was required to bring back the Starlight camera back into operation. 
A lovely flat field test has resulted in sharp round stars at the edges of the frame too. I took 40 sky flats and created a decent master. Dark frames also captured for a full calibration. I like to use a median setting in Maxim DL as this gives best removal of hot pixels. 5,10 & 20 minute guided exposures have given me a very smooth finish. Processed in Photoshop. The best image of M13 I have taken has resolved stars to the core. The somewhat forgotten Ngc6207 is showing structure and threre are a few more little galaxies easily visible. A PGC galaxy 3515221 can also just be seen at mag 19.64. This side by side inverted image and CDC chart confirms its location.


An inverted image of the core

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