alacant

Hi. Have you tried PHD2's PPEC? Set it to begin at whatever pecprep indicated as the biggest -as in most intrusive- PE and allow it to home in over a worm cycle or two. HTH.

Yes. There's a discussion on the st forum. Ivo doesn't want to second guess with an are you sure, so we must be careful. I think it's something you only do once though!

Ah, glad I got that right! Trying to imagine where it is for you at UK latitudes. I think the bubble will be higher for you whereas m8 would be higher for me...(?) I would be. Excellent shot. It also stands up to enlarging. I can id the bubble and the cluster but what's the nebula toward the bottom?

Suggest vica versa? Certainly from here, the lagoon would be too low after the bubble was at a decent altitude. HTH.

Hi. I don't agree with that (sales talk?). I have a dslr which cost far less than half that; it works fine for deep sky stuff. +1. Start with just a camera. HTH, clear skies and good luck.

Look at the photo -it's fine- NOT the guiding graph!

10'?

Hi. When you have it as good as possible, offset the polar alignment by say, 10º in AZ. DEC then drifts and has to be corrected, but in one direction only. The motor always turns the same way for the correction; no backlash. Works as close to the pole as ngc2403, haven't tried closer -I don't think there is anything. HTH.

+1. BUT just a heads up that before the OP corrects the collimation, he should take flat frames with the existing collimation, otherwise the 'light patch' will not coincide. HTH.

Hi. I believe we know why that is. However, before you correct that, take flats AS IT IS to help correct this image. HTH.

Hi. OK, hang the camera on the laser then. If the beam stays put, you're fine.

Hi. I think you have to be more systematic. Again, JTOL, things you can try whilst it's still cloudy: Does the collimation change as you tilt the telescope tube? Does the collimation change if you hang a weight the equivalent of your camera on the Cheshire? Is the primary fixed in its cell or does it float from side to side? Does the primary have strong enough springs to hold it for ap? Is the secondary correctly aligned for twist and tilt? Does the secondary move when the tube is tilted? Is the secondary spider centred in the tube? Does the collimation show the correct offset whilst looking through the Cheshire? HTH.

Hi. I think so and/or tilt although it doesn't show the FWOABW light leak I mentioned. Maybe just my inadequate processing. Here's the master flat showing the tilt... HTH.

Hi. How does -the stretched- master flat frame look? That may help us diagnose moon or not...

Here's a quick look at your stack with StarTools in big-hammer mode There is colour... I think the main problem is gonna be the gradient bottom left to top right and what could be a light leak top centre. Certainly doable though HTH.

Amazing. Just imagine if you took 2 and stacked them. Almost twice as good; take loadsa snaps, stack them and see how the image improves. HTH.

Everyone say's I'm crazy: AP with a 6" f8 on a rusty old eq6? But hey, you can snap the ring nebula without having to put an arrow showing where it is!

Hi. ic5067 nebulosa del pelicano. HTH.

Moon again. Last night of this sort of deep sky stuff for a week or so. Oh, and that awful halo-ridden aliexpress cc... 3 minute snaps with 700d.

Hi. No. Leave the polarscope tight. Rotate the RA axis to the 6 o'clock position. That is when Polaris is at the top of it's orbit. Clamp RA. Now rotate the RA scale to whatever time Polaris transits. E.g. today at Alicante, Polaris alicante Location: W 0°38'00.0", N38°00'00.0", 0m (Longitude referred to Greenwich meridian) Time Zone: 2h 00m east of Greenwich Date Rise Az. Transit Alt. (Zone) h m ° h m ° 2017 Jul 01 (Sat) ***** *** 10:17 39N Then, when you're ready to align, rotate the RA to the current time and adjust alt-az to put Polaris in the small circle when looking through the guidescope **EDIT: polarscope. HTH.

Hi. Nice shots. JTOL; I wonder for the earthshine it would be possible to scale both shots and then layer them? It may make an interesting shot.

I've run out of excuses. Maybe we should have a tick list for each post: cloud, rain, cold, hot, hazy, owl, time, tracking, filter... So how about it was hot, dark, late, sticky and noisy. Not had those for a long time. But seriously, any comments here most gratefully received. TIA and for looking. 24x150s.

With turbulence over the southern horizon rife, the 700d sensor at 38º and the smoke from the San Juan fires, it was StarTools' superb deconvolution to the rescue. There's noise but it's bearable, as isn't the chromatic aberration from the cheepo cc making it look like it's been taken with an expensive refractor;) Thanks for looking and cool clear nights.

I'd guess the latter needs extra inward focus. Also, the swcc needs an extra 11mm of inward focus -compared with the focus position without cc- pulling the focus tube even further into the light path. HTH.

Apart from using a GSO coma corrector -which spoils the nice wide field- the only solution I found. HTH.