Radar 525 Report post Posted August 7, 2016 I am thinking about tinkering with death. Actually, its not that bad, but I'm thinking about pulling apart my C14, and building some type of bracket that holds and fixes the primary mirror in position permanently, getting rid of the in built focusing system and simply using a crayford style focuser to handle focusing. I think this would remove any mirror flop. At the moment, I don't get much mirror flop, but when I do its enough to ruin collimation, ruin an accurate computer pointing model and if it happens during an exposure can cause poor stars and the edges of subs to all be different. I know the mirror already has screw holes in the back of it, I already have flop stoppers which actually work okay, but it could be better. Not sure if anyone has any comments or suggestions about this. I don't envision the mod would be overwhelming difficult. Ray Share this post Link to post Share on other sites
wingeing Pom 660 Report post Posted August 7, 2016 But then of course you couldn't use a Hyperstar Greg Share this post Link to post Share on other sites
wingeing Pom 660 Report post Posted August 7, 2016 There's quite a number of articles out there (I looked into this years ago) about how to either clamp the mirror - or better still - provide a bit of stiction between the outer edge of the mirror and the OTA. With the stiction method you can focus and it doesn't tend to flop. Greg Share this post Link to post Share on other sites
Astro_Pool 33 Report post Posted September 9, 2016 Set the mirror so that your rear SCT addon secondary focuser is halfway, then you have travel both ways. Dave Share this post Link to post Share on other sites
Radar 525 Report post Posted September 9, 2016 Cheers Greg. Cheers Dave. I got the exact same advice from FB the other day. I hadn't thought of it. I'll try and do this early next week and document my results. Ray 1 Share this post Link to post Share on other sites
