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gso back focuser on combination of rc8 and ts flat2

25 Sep, 2018 15:06
I have gso rc8, ts flat2, ts flat2.5 and sbig stf 8300m, fw8.I would like to know the flattener back focuser on each of ts flat2 and tsflat2.5.
thank you.
Edited 25 Sep, 2018 15:08
27 Sep, 2018 22:56
Teleskop Service has a good customer service. Information about backfocus is also usually written on the flattener page.
29 Sep, 2018 08:38
I have the GSO RC8".
For the KAF8300-Chip there is no need to take a correktor, because the field of a RC is flat!
For APS-C or bigger you can use the 1:1 RC-flattener "TSRCFlat2" - Distance 109mm.
For reducing the focal length the CCDT67-Reducer is fine - Distance 85mm +/- 5mm.
By the way: for kollimating the RC  the best and easiest way is, to use a Cheshire Collimating Eyepiece (TS-No: 0 TSCH)
CS Rolf
Edited 29 Sep, 2018 08:43
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