2.11
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| That is a problem of the adapters between the scope and the camera. You are blocking the light. I bought Baader Universal Filter System and the problem disappeared. I use the RASA11 with the ASI2600MM; no problem. I don't shoot flats nor darks nor bias. I only shoot light frames. |
1.20
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| Check out Lukomatico on You Tube. Hes recently done a video on this very topic... |
2.41
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Nathan: I have done a ton of work with both the RASA 8 and RASA 11 systems and this read might be worth looking at: https://www.asgastronomy.com/special-rasa-optical-train-setups/ The M42 is pretty much a no go with this scope at the distance it puts it. The M48 is also very restrictive at this distance from the sensor and F/2. I didn't see in this thread anything about what the total optical train looks like or your full setup is, but that vignetting seems very much like obstructions in the pathway. A good tool to use is this one: https://astronomy.tools/calculators/ccd_filter_size If you put in the RASA 11 and 2600, notice that at 55mm from the sensor at this speed, you need over 50mm aperture to clear. The RASA 11 adapter is 17.8mm or about 55mm away from the sensor, thus even M48 adapters don't really clear... also considering their inside usable room is much less than 48mm. Jumping to an M54 system is the way to go at minimum with a aps-c sensor on a RASA 11 in my opinion. Jumping to M68 if you go full frame will get the full benefit of the RASA 11... just in my opinion though. Doesn't mean other avenues will not work, it just doesn't yield the best benefit of the instrument... |
1.20
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| As what Alan has described above, lukomatico has made a video on this. Here's a link to it I love & hate this telescope lol. RASA 11 - YouTube |
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2.11
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| https://www.baader-planetarium.com/en/baader-ufc-(universal-filter-changer).html This system works perfectly for me with the RASA11 and the ASI2600MM |
