Small Doublet vs Small Triplet

[roughy]

70 to 80mm for wide field imaging. Is there a noticeabe difference in results as there can be in price?

[Slawomir]

It depends on the focal ratio, type of imaging (RGB vs narrowband) and how close you look at the pixels around bright stars.

[roughy]

Initially it will be with a DSLR, probably around f5 or f6 from the scopes I have looked at.

[Atmos]

A triplet will definitely be better than a doublet in that case. More expensive but the colour correction and sharpness will be considerably better.