tooth_dr

Thanks Dave, that was well worked out! What does this frequency tell me?

I have a through-flow of air via open door, its open throughout the day when roof was open. I dont have any heaters on the mirrors. The fan isnt on when imaging, I've tested that, it does cause movement if on. In fact I havent used it much. It doesnt feel like this is a local issue with respect to thermals. It's a good consideration, but it's not like I'm opening the roof after a baking hot day and imaging immediately. I'm seeing these oscillations at 4am in the morning, in fact I'm seeing them all the time, so that to me points to a mechical issue. GA I thought gave you information based on seeing, so it gives you the best guiding exposure time for that evening, as well as min movement values. Thanks for the input, and it is useful to explore all possibilities.

Thanks. I will try 75%. I used PHD2 GA and it nearly always recommends between 1.5 and 3.5s exposures. I’m not sure how much more flow I could achieve with an open roof? Could you offer suggestions? With regards to the scope - I have a fan fitted. Do you think at midnight with the scope being open, thermals are still relevant? These are all things i have never considered in depth so I really appreciate the input.

Thanks Wim, coming into the summer now I have time to improve my set up. I've attached the guide and debug logs for each image. I have included the object name in the file name, and I have also added what row within the log viewer that applies to that image. I appreciate any help on this @wimvb @Xplode M64_PHD2_DebugLog_2020-04-13_211832.txt M64_ROW8_PHD2_GuideLog_2020-04-13_211832.txt M94_PHD2_DebugLog_2020-04-14_192804.txt M94_ROW6+7+19_PHD2_GuideLog_2020-04-14_192804.txt M101_PHD2_DebugLog_2020-04-20_214745.txt M101_ROW4_PHD2_GuideLog_2020-04-20_214745.txt M106_PHD2_DebugLog_2020-04-19_220232.txt M106_ROW2_PHD2_GuideLog_2020-04-19_220232.txt NGC3344_PHD2_DebugLog_2020-04-21_224217.txt NGC3344_ROW4_PHD2_GuideLog_2020-04-21_224217.txt NGC4565_PHD2_DebugLog_2020-04-16_221746.txt NGC4565_ROW3_PHD2_GuideLog_2020-04-16_221746.txt

Thanks Wim. I also bought the hitec astro motor focuser controller but never set it up. That would be a great idea, just to have offsets set up.

I use a 1200mm scope with a KAF8300. This gives a native resolution of 0.93”/px with 5.4um pixels, and could be binned to give 1.86”. That would be close?

If it’s just a crop then I would line up in PS like you suggest. I thought it might just a crop from your opening post. APP takes care of skewing and scaling etc so can be useful if data is from different nights or different camera or scope.

Its a mesu mount with a 10” reflector and an ED80.

Nope I realise what’s wrong. At the top middle there is a little drop down box. Change it to registered. Now double click the images and load up on screen and then save.

Can u screen shot APP after you have completed tab 4

Makes sense. I have a lot of short exposures I took one night. I’ll trawl through them tomorrow and see if I can find one suitable. What do you think is happening here?

No I didn’t refocus, I don’t have an focuser capable of this. I went for a compromise (please don’t shoot me)

I dont know, not sure, didnt see any difference, either of the first two will work.

I can post logs guys, all PHD2 stuff is stored on the observatory PC, and I'm almost in bed, I'll post logs tomorrow that relate to the images. I havent noticed satellites trails like that before I started using the 10" scope (but I've also changed mounts too so thats two variables changed. Are they the same pre and post flip - in short yes it appears so! I found this image of M94, and it's post-flip, and the satellite is wobbly.

APP is a little convoluted to get onto, but it works a treat. 0) choose a folder to save the images that will be produced in APP 1) load both images as 'lights' under tab 1 2) click on tab 3 and click 'analyse stars' 3) click on tab 4 and then click 'set reference' 4) choose the lum file from the list of two files at the bottom. It will tell you that the reference file is updated 5) on same tab 4 click 'start registration 6) thats them registered 7) to save - double click on the first file and it will load up on the screen - on the right hand side turn off stretch and then click save 8), repeat for second file.

@smrAPP will do this, its free to download and use the trial version for a time frame. If you upload them here now I'll do it for you, and post the aligned images.

@wimvb Here are a selection of single subs taken pre-meridian flip, any feedback would be appreciated. I have checked collimation at the different positions. I used my Tak collimating eyepiece, and the collimation doesnt change no matter where the scope is pointed. The focuser is 180 degrees to relative to the ground which got me thinking that was the problem. I have a Mesu e200, so balancing is critical, and with a dual rig and two very different scopes it could be an issue, but I'm would say I was confident that it's accurately balanced in all three axis.

I’ll post a single sub shortly cheers!

Thanks again Wim. I’ll have a look at doing that! Not sure how to chart the RA/DEC lines on the images that I see others doing.

@Xiga

Thanks Wim. It could be a balance issue, I hadnt thought of that. I have it quite well balanced, with no preference to east or west. Would there be a way of checking the orientation of the elongation to see if it was drift due to balance/tracking, rather than a focuser issue?

Thanks Ciarán. I’ll try this again. That’s some difference.

My Meade LXD75 was the loudest mount I’ve owned. I cringed every time I skewed to anew target in the middle of the night.

It is very blue now 😂

I reworked my RGB data using some very good advice from Xiga on here. Unfortunately once it came to processing and adding it to the LUM, I hadnt a guide to follow so it went downhill rapidly. However I have managed to shift away from all my RGB images looking yellow. This is what I now have, any advice on working with the Lum ie link to a good PS guide ,that would be appreciated. Thanks again Adam.