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Thanks JA, much appreciated!
I hadn't thought about star trails as I get further from the celestial pole which shocks me, it's common sense. I haven't had a chance to get out for a while and now our weather seems like it's turned nasty, anyone would think it was still winter.
When the sky clears next I will get out. I've noticed 25 second exposures still get me elongated stars, more outer edges. I'll next run at 16 seconds though I last night hand filed a piece of aluminium stock I had laying around and found it clamps nicely into my EQ5 PRO head, easier than setting up a scope, just one modified piece of aluminium stock and a tracking mount outside, may allow me to use higher zoom lenses.
I'd like to try my old 70-200 f2.8 I purchased new in 91. It's the 16 glass elements and should produce crisp images. The autofocus has always been a little crappy for the price of the lens new but the images have always been amazing, back when I could hand hold the 1200 gram weight at arms length for zoom photography. Not so much now.
The filters would be for a range of lenses, cheaper for me than buying a filter for every lens. I'll have to look into them.
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