[astroboy]

Up for sale a 84mm F6.5 coated achro doublet in good shape.
One element has a very small ( about 3mm ) chip on the edge so will be covered by the cell that you would been to make.
This is meant to be air spaced so you will need to put some foil spacers in between the elements.

$60 posted in Oz

PM if interested

Thanks
Zane