The first sub of the evening has elongated stars, every sub thereafter is fine. Same thing happened last night the first sub had stars that looked like there's a guiding problem, but every sub after that has stars that look round. Should I put a 5 or 10 second pause in NINA after plate solving and before imaging to resolve this? Thanks! Jerry  |
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If it's a scope settling problem then yes. That or just cull your first sub.
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I always program a short dummy shot to be the first after slewing to a new target because my old mount had both DEC and RA play. For my mount, I found 10 seconds to be adequate to eliminate this problem.
The first image after meridian flip would sometimes also exhibit some elongation but I had no means of inserting a dummy at that point.
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Sometime the guider takes a bit of time to adjust even after the calibration. Did you check the graphs on PHD2?
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I see a similar issue with when dithering. If no delay is set on start of sequence, the sequence will dither and start exposure without settling. This will cause streaked stars in the 1st sub. The additional subs have a dithering settling period before starting exposure.
Lynn K.
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These are unguided, the 10MicronGM1000 mount does fine without guiding at 1000mm focal length under Bortle 1-2 skies.
I'll insert a 10 second delay between Solve & Sync and starting the image run…
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Brian Diaz:
hi
take a look at this article
https://www.astropix.com/html/astrophotography/diagnosing_trailed_stars.html
maybe help you
CS
Brian Thanks Brian, I read the article it's very helpful and well-written.
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My guess is your guiding and/or mount has not settled.
Troubleshooting,
1. Check that guiding as settled, recalibrated and started successfully before starting to image
2. Have you recalibrated guiding for each session?
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