I was thinking of purchasing a 80 mm achromat lens
assembly to put in a 90 mm tube. Does anybody
have any suggestions as far as how to properly
compensate for the difference in diameters?
Would a wood ring (oak?) be a bad choice?
assembly to put in a 90 mm tube. Does anybody
have any suggestions as far as how to properly
compensate for the difference in diameters?
Would a wood ring (oak?) be a bad choice?
