The focuser could be much, much better on the RASA and it would be nice to have the built-in fan for cooling. When compared with “Hyperstar SCT” systems, the RASA 8 provides better optical performance and field illumination. In any case, at some limit you'd probably get better performance from the RASA and Celestron claims just that on their website. So, 6.5mm from the camera and 6mm for the gender changer and you're already beyond the available 10mm. Actually, I don't think you could make that work since you probably need at least 6mm of threading on the gender changer to allow you to thread both of the male ends into the adapter. Unfortunately, the shortest such adapter that I know about is 10mm thick and given the minimum 6.5mm backfocus available on the camera body that would exceed the remaining 10mm (since you'd have 6.5mm on the camera body itself and an additional 10mm for the gender changer, so 16.5mm of total spacing). I guess that would work on the ASI1600 but that would also require a very short female-to-female t-thread adapter to do the gender change between the filter drawer and the male threads on the ASI1600 camera body. Otherwise, the thinnest filter draw that I current own is 15mm thick (from Teleskop Service) and if you assume that the stated 25mm backfocus is "real" and includes the proper and short t-threading then that leaves only about 10mm for the spacing between the filter drawer and the camera sensor.
#Celestron rasa 8 inch full#
I guess if you wanted full automation you could limit yourself to one filter per night (and use the built-in internal filter location that is provided on the RASA, but that's assuming that any narrow band filters become available that fit that internal filter location). But, maybe not any more so than your EdgeHD with a HyperStar (you'd have to look to see what kind of backfocus is available on the HyperStar). However, the short backfocus (25mm) for the camera suggests that this would be kind of a "bear" to operate for narrow band or RGB filtered imaging. I'd guess that this would be a wonderful system for one-shot-color imaging under a dark sky. Does anyone have experience with the Celestron RASA system, specifically in using monochrome cameras along with LRGB & narrowband filters? Would that setup work? Is there some kind of filter drawer system for the RASA?Īnd would the RASA in theory deliver significantly better images than a HyperStar and EdgeHD 8"? Has anyone here had experience with both the HyperStar system and the existing larger Celestron RASA scopes? I have a ZWO ASI1600MM-Cool camera which I intend to continue using. So I'm wondering whether I should still go with the HyperStar for my EdgeHD scope (about $1,000), or wait and go for the more expensive Celestron 8" RASA ($1,699) that's due to be released in the coming months.
However, I just saw the announcement today of Celestron's new 8" f/2 RASA. For those not familiar, the HyperStar would turn my existing f/10 EdgeHD scope in to a faster f/2 imaging system. I currently have a Celestron EdgeHD 8" scope and CGEM II mount, and recently been researching the HyperStar by Starizona as I want to do faster, wider-field, astrophotography.
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