red dwalf

wow i wish i could get that amount of detail in 2 hours, excellent

Interested too if others fall through

You'll need to lower the exposure time to get a histogram reading to the left, increase it to go to the right.

last nights were 10 minute subs in HA, so much of the rubbish that Luminance might pick up, HA should reject. many thanks for the help, much appreciated

here is last nights endeavours under another less favourable sky

very true, i think we are all striving for perfection under less than perfect skies

i`m unfortunately in the middle of a housing estate between two big cities, Nottingham in the east and Derby in the south west, plenty of houses around here and in this hot weather i`m sure there are plenty of hot tiles on the roofs, in fact i had trouble cooling the Atik 460 down to -10 degrees even at 2300 hours.

i can see some light cloud around this evening, graph looked a little flatter earlier, i usually go for 3 or 4 second exposures but last night phd guiding assistant recommend 2 seconds

here is tonight's phd graph and and the single sub 1 min lum m31-1_006.fit

had a little time last night for a few test images as not been out much this summer with virtually no real darkness, 1 minute subs on M31 with much the same values as the other, checked and did a nice polar alignment and guiding seemed to be good.

finally had a minute to re process some earlier images in deep sky stacker, 3 minute lumiance subs, and here are the results for fwhm, what would be my sampling rate ?

morning, just to clarify, is the 120mm usb 2 mono guide camera the older version or the newer one compatible with the asi air ? https://www.firstlightoptics.com/zwo-cameras/zwo-asi-120mm-mini-usb-20-mono-camera.html

i would take camera off the setup completely to take dark's and put it somewhere completely dark, it`s amazing how some light can get into an imaging train, then make a little library of your usual expose times, i.e. 1 minute, 3 minutes, 5 minutes and so on at your usual imaging temperature, mine being -10 degrees Celsius, these dark's will keep for a good 5 or 6 months before they need doing again.

i can sympathies with your dilemma, following advice

Yes indeed, I use DSS for stacking and can remember seeing these details for fwhm now, didn't really pay much attention too them in the past, I usually use the score to determine the best subs, many thanks, I'll do a few subs and try to use formula.