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The cotton wool is just stop any dust getting into the chamber from the mol sieve. The sieve I use came from a lab I used to work in and is a high quality grade, I can’t vouch for the dustiness of what’s available now but I think the dust risk with a cotton wool plug is low. I’ve used mol sieve on all my cameras for the past few years, lasts longer than silica gel and just as easy to regenerate.
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If you’re still using the pale pink silica gel desiccant supplied with the camera then ditch it. As mentioned in one of the messages use molecular sieve 4A. After a couple of days my RH dropped to 24% a bit extreme but it would ensure your chamber was thoroughly dried out. After a week or two the RH increased to 60% which says the chamber is not sealed effectively. I run it at about 65% at -10C and never had the dark spot problem.
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Just wondering if anyone else sees these specs in their cooler fins, is it dirt or surface mount components ☺️ if it’s dirt should I carefully clean out? Could be something from a nearby conifer. Never noticed them before.
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I’ve been working on images of M81 and M100 LRGB mode 0, gain 26 offset 30 with 60s subs at f5 and neither show the cores burned out. Hope it’s clear for you 😉 Rob
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Molecular sieve is capable of reducing the humidity to ~20% whereas silica gel is higher, from memory around 40%. The Atik cameras use mol sieve tablets and I think some ZWO cameras too. 4A sieve is usually recommended for moisture absorption but 3A will work. (not that you need to go down to 20% in this camera 😊)
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Looks like a comms issue to me, have you tried connecting the camera directly to a pc with a short usb lead? It works fine on usb 2.0 with downloads of about 2s. The other thing you could try is using the QHY app, very basic but it might reveal something if the images are ok. I received mine in June and didn’t have any problems with driver installation.
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The Ha filter should centre up with the electronics on the filter wheel so I’m a bit puzzled why it should appear to be out of centre. Perhaps try the reproducibility of the centering a few times and see what you get, applies to all the filters as well. The masks look good either option, I was thinking just knock one up out of black card to test the concept before you spend the money.
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Congratulations on the new camera 😊 I would try and get a few images to calibrate and see how they work out, but the SHO flats do look unusual, the Ha appears to be off centre. You could try making a mask for one filter and see if it has an effect before you invest in a full mask.
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Thanks Steve, I would think if you can use ROI for planetary etc. it should work for longer exposures, I’ll dig a bit more to see if I can find out.
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Rob_Jn started following QHY268M & QHY268C Users Thread (Please share your knowledge and tips)
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Hope I’m not off topic here but I’m considering buying the QHY268M and would like to know if I can hardware bin 2x2 and also does the camera support ROI for deep sky imaging? The ASI2600MM supports both in their specs. thanks, Rob
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Brilliant, thanks that worked 😊👍
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Anyone got a good ephemeris for JWST, I get an error on JPL Horizons 😐 tried quite a few settings but all the same error message
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Phew, I have succeeded in cleaning it without removing the lens but took a soft lens cloth on a rod and gently tried rubbing a small area and it seemed to clean up, carried on very carefully and although it’s not perfect it’s nearly back to normal ( most of the dust you can see is on the outside now 😊) I suspect I’ve been very lucky in that it has started to develop recently with the onset of damp and cold weather. Lesson learned though I’ll be keeping it indoors from now on. thanks for all the advice guys, Rob