alacant

Indeed. However all a filter can do is remove signal, never create it. Do without or isolate the emission with say, a UHC. No need to spend a fortune blocking even more light;) You can see here that there's quite a bit more to be had from the data you already have. HTH

Hi When beginning, I strongly advise processing manually with Siril. Things then become far less of a mystery and by the time you have copied the files to where the script expects them, could be most of the way through the process anyway. Go to the scripts when you've mastered the basics. You'll almost certainly -especially with a dSLR- stick with manual anyway; you control the outcome, not the script. Cheers

Hi It looks unusual, but we can't tell for certain because we don't have a light frame against which to divide, nor do we know the offset etc... If you're looking for a more definitive answer, maybe post -links to- originals of all the frames you intend to use for calibration. Cheers

Siril makes it easy. Pre process each exposure set, copy (or use the conversion tab) the pp files to a new working folder. Register Stack That's it. Cheers and HTH.

Everything you need is here: https://siril.readthedocs.io/en/latest/

No. Just enter the bias value. Instead of a bias filename, simply enter the offset: =2048

It's quicker to load the flat sequence, enter the offset value, pre-process and stack. Use the flat you just stacked to calibrate the light frames with the same offset; this time register before stacking. That's it. To begin with Siril, especially as there's so little to do for DSLR images anyway, I'd recommend doing everything manually. An understanding of what's happening and why is important for troubleshooting when the scripts don't work, and (I find it) quicker anyway... By the time you've moved stuff to where the script expects it to be etc. etc... HTH

Hi Good idea. 2000d? So you need only take flat frames in camera. Subtract the offset manually on the calibration tab. Both In-camera bias and dark frames on modern eos' serve only to introduce extra artefacts, especially but not limited to noise, so making processing more difficult than necessary. Of course, try both ways to see which you prefer..But hey, the image is good as it is. Cheers and HTH

Love it 😀

Hi Remove the polarscope and cover plate and loosen the cone bearing at the base of RA, rotating the circular nut anticlockwise around, say, 1/10 of a turn at a time, until the axis swings freely. There are three grub screws which bear against the thread to lock it (yeah, I know). In between loosenings, give the ra shaft a gentle tap upwards and swing again before retightening. HTH

Yes.

Hi everyone One of those rare occasions of skies good enough to hold up 1000mm without having to bin or process it to death. Thanks for looking and do retain those long telescopes at the ready. One never knows... gso203 ~4h

Hi everyone Non numeric names usually mean nice bright objects doable with small telescopes in an hour or so. Not true this lot. kstars' -excellent- HIPS planetarium gives ngcs 7320 and 7331 which respectively wikipedia out (new phrasal verb?) to Stephan's Quintet and Deer Lick. I thnk that to get anywhere near in a reasonable time is gonna need better than four hours and a bottom of the range reflector. Anyway, here is what I managed. You can just about make out structure in the cute quintet. Thanks for looking but not recommended🥱 r10+gso203, siril git 1.3.0a, st 1.9.855b, ~4h

Hi everyone I don't usually as my patience gets the better of me, but this one I left most of the night. Processing similarly. If it takes more than 1/2 hour, give up, and anyway, my gf doesn't allow it! I hate smoothing/denoise so am wondering how many more nights I'm going to need to be able to fit into my 30 minute (sic) post timeslot... Thanks for looking and do share your experience if you've had a go at this. gso203. siril git 1.3.0. st 1.9.558b. ~6h

Subtraction of the bias, yes. Bias frames, no. On Eos we find that they introduce artefacts, including noise. Siril makes offset removal easy. I explained how here; There's also a link to the excellent Siril documentation. Cheers

Hi Lovely shot. After 16 hours, the noise is most likely introduced by using in-camera bias and dark frames. The best way we find with an eosxxx is to simply subtract the offset -the 800 uses 2048- instead of applying the former. That, along with -at least- a 5 pixel dither between frames and stacking with a modern clipping algorithm should obviate the need for smoothing/denoise. Cheers and HTH

Hi By far the easiest way to get started is by having someone with deep sky imaging experience by your side. Your local astronomy club will be sure to be able to supply you with such. Everything becomes less of a frustration that way and you'll be underway in minutes rather than hours. Or months! Cheers, good luck and HTH.

- Process the second night as you have the first but stop after calibration. - Create an empty working folder and set siril to that folder. - Conversion > + - Select the pp files from the first night - + - Select the pp files from the second night - Enter a name for the new sequence - Convert - Register - Stack

Yes. Documentation: https://siril.readthedocs.io/en/latest/ HTH

Hi Just over an hour? Well done. The star field gives nice structure. 2000d? so iso800, dither at least 5 pixels between frames, lose the dark and in camera bias frames and simply subtract the offset -Canon use 2048 on later models- during calibration. The flat frames don't seem to have corrected. This may explain the dark blobs and vignetting. Cheers and HTH

Hi everyone Super bright moon last night, 96% I think, so of course an excellent clear night with steady seeing. Ah, well... I hate sitting in front of a computer for anything longer than is absolutely necessary, so it was fortunate that Siril and StarTools gave something reasonable at the first asking, without having to jump through hoops. Whilst these four were as far away from the moon as we could find, it was determined to make its presence felt. Thanks for looking and do post if you've had a go at any of these, especially if it was under a compromised sky. Full moon processing tips especially welcome. nt150s cal y apil: siril 1.3.0a. proc st 1.9.558b ~2h ngc7243 m39 ngc884 with ngc869

Not in our experience. None of the low-end Newtonian Telescopes we have tested hold collimation out of the box, especially if collimated horizontally, due mainly to lateral movement of the main mirror, tendency of the same to 'fall forward' toward the retaining clips, tube flex etc. as the tube is tilted. Fortunately, there are simple modifications which allow collimation to hold at all angles. We outline them here: https://linuxcb.blogspot.com/2022/06/gso-tube-support_22.html Collimation wise, be sure to read Telia's collimation myths and Seronik's no nonsense guide, both of whom outline the simplicity of a much misunderstood procedure. Cheers and HTH

Apologies in advance for the noise. I tried an electronics forum but received indecipherable replies. I wonder if there is anyone here who can give me a simple answer to this question... I have this re-usable rj45 plug with 4 attachment points above labelled A and 4 below, B. Question: which wire from a category 5e cable do I put where? Alongside is the wiring of a conventional plug which I'm trying to imitate. TIA and clear skies.

Hi everyone Much fainter than i expected but still disappointing not to see more blue. I suppose the usual more frames applies. With the temptation of Sagittarius now getting rather low to the south, I may just do that. Good to see an old cheepo Bresser still able to produce something reasonable; you don't need €silly to have a go😊 Thanks for looking and do post if you've had a go at this, especially any tricks to pull out the blue. nt150s + UHC ~4h cal:-apil siril git 3.0.0a proc: st 1.9.588b

We can't tell because we don't know what images taken through the lens look like. My guess is that with that pattern, the red and green will be in focus leaving blue rings around bright stars. Perhaps post an image focused with the mask of, say Deneb? We should then be able to offer more precise help. HTH