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With 1.83 of sampling rate, you don't have worry a lot about seeing, except if it's really miserable. From 120s for bright objects and 300s for faint ones, you have a range of choices. |
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Bortle 9 Dim Light Chaser:Hi, If you ever attempt that again, just turn on the RICE compression and you probably won’t run out if disk space. |
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Gary JONES:Mark Worthington: *Thanks again Gary, for this useful info. My initial plan was to use the memory on the AA plus for dso AP, but in the case of planetary, to directly connect the imaging camera (zwo 224mc) to the laptop. I did consider changing from AA plus to AA mini, and using SD cards in the dslr for dso. Not sure on this route though. |
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Hi Mark, OK - so you plan to use your AAP for DSO, and your laptop for planetary imaging. I never used my AAP for planetary, but it does support planetary imaging, so would expect it to be reasonably capable, providing you choose the right settings. What is your reason for using your laptop rather than the AAP ? What app do you plan to use on your laptop to capture images ? Will your laptop be able to provide the bandwidth required ? How will you drive your mount to do a polar alignment and track your planet ? The issue of course is image capture speed, which needs to be much higher for planetary than for DSO. Your camera is 1,304 x 976 px = 1.3 Mpx, so the file size for a single frame at full resolution and bit depth will be about 1.3M x 3 x 12 bits / 8 = 5.7 MB. At that resolution, the maximum frame rate is 64 fps, so the video bandwidth will be = 5.7 x 64 = 365 MB/sec. The write speed of the eMMC RAM in the AAP is 95 MB/s, so, if my arithmetic is correct, it doesn't seem possible for the AAP to capture images from your camera at full resolution and frame rate. So, you have 4 options :- 1. Use a lower frame rate; 2. Use a lower resolution - bandwidth is proportional to resolution - but that might sacrifice image quality, depending on your target and focal length; 3. Use a combination of 1 and 2; 4. Use a capture device with a faster frame rate - which would be limited by the USB 3 port @ 5Gb/s - which would easily handle 367 MB/sec = 2.9 GB/s. IMHO, trying to capture images at that bandwidth on a PC could lead to lots of frustration, and is still limited by the PC's SSD write speed. I tried using ASIAir on a desktop device, but was unable to get it to work reliably - and you still need something to manage your mount and do your polar alignment etc. The AAP is designed to provide a simple solution for most imaging applications, which is its core strength. Its set up for DSO and planetary imaging, and provides great support for ZWO cameras and most mounts. My advice would be to stick with the AAP for planetary, but choose a frame rate that fits within the AAP's 95 MB/s speed limit. Something like 95/5.7 = 16 fps would be the maximum possible - lets say 8 fps to allow for processing overhead - that should be well within the capability of the AAP, and is easily fast enough for most planetary work. I suggest you run a few experiments - set up your AP and camera inside, and see how it performs capturing full resolution images at various frame rates. I'm not 100% certain, but would expect the AAP to tell you if it drops frames. Then select a frame rate that provides a reliable image stream, and use that for some real imaging. I hope that helps Gary |