Quote:
Originally Posted by Atmos
I’ve seen someone on CN using a FC100DL F/9 with a Tak reducer flattener and it surprised me with the level of colour correction and star sharpness 22mm off-axis BUT even reduced it was still about F/7 so quite slow.
I believe the difference between the DC and DF is the focuser and dew shield but Lewis or Matt will know better than I.
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F7 is a bit on the slow side these days.
Do you have a link though?
I imagine Tak has advanced their fluorite doublets over the FS series. Just how much I don't know. It seems they are more geared towards being a visual scope with F9 native. That also helps with the colour correction.
Greg.