Quote:
Originally Posted by janoskiss
Fantastic! Achromat for narrowband makes perfect sense. 6" should give you nice resolution too.
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You are so right but first the achro has to have 'good' correction ie lack of spherical aberration.
I did a careful check and this finally committed me to trying it out.
http://aberrator.astronomy.net/scope...tor_150_3.html
I am not the old fool you all take me for and I am sure it could be worse.
Just joking!
Somebody has to try to be original in thought and action.
Below you will see an image of the helical focuser I have fitted to the 150mm F4.5 and there is almost now no vignetting. Only because I could not find my hacksaw! I had to use the araldite. Behind the helical focuser is the filter box and after that the Hutech FR/FF.
Bert