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Hello, I'm considering purchasing a DR350 for remote observatory installation. There's a few questions I have about this OTA: First, PW claims a 60mm image circle. Is this actually usable for a medium format camera like the ASI 461MM or is it only actually usable for full-frame? I'm a bit nit picky with my corner stars! Next, I'm considering the Series 5 focuser and rotator combo. Any issues with this equipment? I'm concerned about changes in tilt during rotation. Speaking of tilt: What, if anything are you using for tilt correction? There is insufficient backfocus for the Series 5 focuser/rotator combo with an OAG and EFW to use a Gerd Neumann CTU or similar. I assume a Photon Cage would be sufficient if tilt correction is necessary. With something like an Optec Gemini focuser there would be enough space for a CTU, but those are back ordered. Fourth and almost last, what are you using for flats? The only remote capable flat panel I could find of appropriate size is from PrimaLuce Lab. Finally, are you happy with the scope? Do you wish you had gone with something else? Thanks and CS, Jon |
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Hi Jon, I'm not sure how many DR350 owners are using medium format - I would think that most are using ASI6200 or equivalent (as am I). So I can't comment on such a set up but stars are fine of course with full-frame. You would need big filters though - I see minor vignetting with 50mm unmounted filters but rather more intrusive vignetting with 2 inch mounted. So you would be up for 50 x 50 and the special ZWO filter wheel designed for the ASI 461. I don't use the PW focuser/rotator either and went with the Prima Luce lab equivalents - which are very well made - but I do definitely see changes in tilt with rotation. I started out with a simple Baader tilt corrector but this was not really up to the task of the delicate adjustments required so then I went to a Photon cage. I am now using the electronic version of the Photon cage which makes life so very much easier. For flats I use a UniFi LED panel as originally proposed on CN: flat panel . If you read to the bottom of that thread you will see that someone wrote an ASCOM driver for it which is fantastic. I can control it (on/off/brightness) a part of my NINA sequence and it only cost $100 or so  You can see it behind the scope in this photo: I'm very happy with my DR350 but did put in an order very soon after it was announced and so it was considerably cheaper than current pricing... Jon (yes...another one) |
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Hi Jon, Thank you very much for your detailed reply. Very much appreciated! CS, Jon |
