emadmoussa
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where can you find a straight through finder with corrected image orientation?
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You would need to add a lens between the main tube and the eyepiece. It would extend the length by 4x the focal length of the additional lens. Would be easiest if the eyepiece of the finder came out, that way you insert a tube with the extra lens in then put the eyepiece into this, rather like a barlow in some ways. If you used say a 15mm doublet lens then the extra length would be 60mm. Not difficult but you would need to make a few bits up, if the finder eyepiece was changeable.
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