labtech1122

would this one work better do you think?

hi yes its a celestron nexstar 6slt, the mount im using is a skywatcher eqm-35pro, guide scope is the svbony 60mm and guiding with PHD2. i have had a look around on loads of forums and some people say its 85mm but are then corrected by many others that its 105mm so not really sure what is correct "You mentioned the visual back, you don't need this, the reducer screws directly to the back of the scope" i dont remeber mentioning that as i have got the reducer screwed directly to the back of the scope, i shared an image of it saying i could use this instead of the celestron adapter as i can put my 1 1/4" t piece into it and make the BF adjustable. "are they completely round with no edge shadowing, if not your scope collimation could be off" yes i have done this and the collumation is just right "part of the "fun" in AP is problem solving and looking for ways to improve" yes i do definately like the reserching and working out differnt things and how to fix the problems i just need to do a trail and error because a minority say 85mmBF and the others say 105mmBF so im going to try both do you know of any adapters that i can use that come wiith differnt size spacers? the on i have is the celestron #93633-A and is a fixed length

the thing i was worried aout with the 1 1/4" before when i was using it all the time was it once being screwed down with the two tightening screw that it wasnt properly central and you would a little bit of tilt

Do you think swapping to this (see image) would help, i would be able to move the back focus around on this set up (the celestron adapter is a fixed length) as you can see i can use a multitude or focal lengths with the 1 1/4" tpiece The thing about it is this way will be 1 1/4" instead of the 2" that the celestron one is, will this make any negative or positive impact on the images taken, i may be wrong ut thought that the 2" would let more light in?

does this set up look ok? telescope, FR screwed strait onto scope, t adapter, t ring then camera?

thanks ive been trying the same thing over and over for over a year now and am finding it really hard to get to grips with, ive got a pretty good understanding of a few things but since getting the FR i get the blue rings and the trail shapes in the corners. im agreeing with people its probably back focus but ive got the same things ive seen other people have but not getting any results

oh ok, i did that reduction because i thought 100s more would show up any issues. i took a photo of orion with 20s and the stars on the outer edges trailed in the same rotaional way (i dont have these images anymore i accidently deleted them

i was wondering if the tracking was ok when i first did the evening so went from 200s to 100s but the trils didnt get longer or worse so i out it down to an optics problem eith either focus, back focus, the FR or the camera. how do i get rid of internal reflections?

ok i will try that on the next clear night, each sub looks kind of ok in the center but alot of trailing on the stars on the edges in a radial fashion. the guiding seemed to be doing ok while i was doing it although im not sure it was up up right, i was advised to use a tracking rate of 0.9x but have since seen people saying not to have it that hight, i used sharpcap for the plar align and got the tracking going and looked ok, some over corrections but seemed ok

ok thanks, how should i do the longer exposure lengths with my dslr, meaning shall i do it sharpcap or backyeard EOS. i tried using the screen on the camera and zoomed 10x but that didnt work. maybe i need to keep trying until its compleaty clear. i went to devon at the weekend and it was so clear and yould see the stars sparkle but its extreamly rare to get that here

as you can see its stacked the images ontop of echother but not aligned. my main problem is the rings though

i live in peterborough but noth is of it so when i photo graph the flame or orion or anything all the light pollusion from the city glares everything. the image i uploaded was meant to be of the flame lol. i focused on jupiter because it was the clearest to see at the time but still didnt show the spikes like you see in all the batinov photos or videos. is it ok to focus on jupiter? attached is the stretched image

because the star detection (im assuming due to the focus) is so bad its not alighing the images either its just placing one image ontop of the other (or i have a setting wrong in DSS, ive tried for about a year now to work out DSS but ive never seemed to be able to work it out

yes sure, shall i stretch it first? ive very hard to see anything on it, ive used a batinov mask to focus on the stars but you cant see the spikes off the star because of the light pollution, i zoomed in on the star with my dslr and tried my best but it was extreamly dificult to see the spikes from the batinov

Hi, does anyone know the correct back focus for the antares x0.63 FR, ive got this focal reducer and the #93633-A celestron t adapter sc, the t ring and a canon 650d

ive been trying to learn how to use pixinsight recently and have gimp. ive managed to turn them to jpeg now

ive stacked 6 images just to show the rings more clearly (ive tried getting the focus spot on but very hard to do with the light pollution i have here, any tips on advancing it?) Autosave001.tif

ok thanks alot, i was worried about the back focus but everywhere i read it says it is right, ive got the antares x0.63 focal reducar and the #93633-A celestron tpiece

hi thanks for your reply, whats the best way to convert it to JPG?

Hi, I'm wondering if any one can help me, I've just started imaging through my telescope and keep getting a very strange set of rings on my images with bright stars, the rings move around and change position depending what angle the camera is at. also the stars at the edges look like they are trailing or out of collimation or out of focus or something. im using a celestron nexstar 6slt with antares x0.63 focual reducer, sc -tpiece and canon 650D. 60mm guide scope with svbony sv305pro to guide I've been racking my brain a lot about this and really need help. DSS wont stack them because it cant see stars and when I got it to stack a couple of images it didnt actually align the images it just put them one on top of the other. blue ring (2).CR2 blue ring (3).CR2 blue ring (4).CR2 blue ring.CR2