The 2" 1.6X barlow is back after a complete
optical and mechanical re-design. It comes in (2) parts.
Part#1 is like a DP2, housing the lens;
2" barrel with T2 output thread. The lens has been optimized for
55mm backfocus, consistent with DSLR's like Canon and Nikon.
Part#2 threads onto the T2 thread of
part#1 for visual use, with the usual twist-lock format. A rubber ring is
supplied; it goes between the two parts to prevent un-threading when using the
This has been designed to not change the characteristics of the
telescope (eg. a Newtonian will still have coma), but edge spot size has been
reduced by 30% over the previous version.