Quote:
Originally Posted by pmrid
Bear in mind that it's an achromat, not an APO so CA will be an issue to some degree and at F5.5 you'll want to look at coma correction too.
Peter
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That is why i use a -V filter and will do mono imaging with refocusing between filters, this way it will perform quite well.
Also mine is a F9 so it is very forgiving with coma.
Surplus shed sells two focal length lenses, F5.5 and F9.