Only tried it on a Tak 76mm F7.5 and a ES80ED F6 refractor but seems a
The Powermate works fine looking at a tree and appears to only have about 13mm extra out focus compared to the 2X but on the Sun no go.
Could this be just the seeing or something else.? Too high F Ratio ? I was impressed by the detail I get with a 2X focal extender but the 4X should be way better. Only had a Coronado PST previously.
Appreciate any ideas , yet to try it on a reflector style scope.
The Pic 20Aug2021 is with a ZWO174MM camera using Firecapture, Autostakkert
Cliff