Calibration Frames Not Working

[opaque cradle]

Would anyone know why my calibration frames are not applying to my image? The biases, darks, and lights were taken at the same temperature ( -24 to -25 ). I have been trying to find out what is wrong off and on for the past 2 weeks. If anyone can help me that would be great.

I am using siril btw

LIGHT

FLAT

DARK

BIAS

[floral flame]

did you only take 1 flat?

[opaque cradle]

8 flats 7 darks 7 biases

[floral flame]

gotta take more flats

are you using dss?

[opaque cradle]

8 flats has always worked for me until now

[opaque cradle]

Siril

[floral flame]

try dss

siril can be weird with flats

[tall prairie]

Siril was fine for me, but I usually take 50 flats if not more

I'm looking into doing 100 flats from now on so that might be the issue

[opaque cradle]

Do you think i am still fine with my amount of darks and biases

[tall prairie]

take at least 25

that would be the bare bare minimum for me

besides, you as long as you're in the same temperature and have the same focus you can take these whenever

i take my calibration frames only after the clouds roll in

so i don't waste my clear time with them

[thin orbit]

100 flats is generally too many around 25-50 is recommended any higher is either pointless or will do something to the image well thats what i got told atleast

[tall prairie]

i'll stick to around 75 then. thanks for the input

[thin orbit]

8 flats is quite little id say around 20 flats is generally a good effect overall but ive never stacked in siril so could be something like that

[opaque cradle]

Thanks for your guys help. Strange that I was getting away with 8 flat frames before but looks like something changed.

[thin orbit]

By any chance are you using longer subs that before? Ive just gone from 2m to 10m and it makes calibration frames sooo much more important

[opaque cradle]

I've gone from 90 to 120 seconds.

[thin orbit]

Hmm that couldve caused it but im not sure maybe just try taking my calibration frames and should work (:

[brisk juniper]

Make sure you have the same focus and iso as your light frames

[muted belfry]

I had an issue too, dss said the flats and darks iso was 200 different to lights 800. I checked multiple properties for shots they matched iso and focal apart from biases shutter speed ???

[opaque cradle]

Having the exact same issues again.
I took 26 flats and 30 darks and biases

[wooden spindle]

Try to clean your lens or sensor

Or both

[opaque cradle]

None of my calibrations are working. not just my flats

[opaque cradle]

but yeah i should do that anyway

[wooden spindle]

i think its so dirty with dust spots that not even flats work lol

Im not sure though

Try to clean your camera and lens then point it to a flats white surface and take a picture

and look where the dust spots are

[thin orbit]

Hmm really odd. Could u send me one of your flats?

Also instead of bias try dark flats instead? Never tried it myself but ive been having issues with flats atm and was gonna test this

[opaque cradle]

I dont know if anyone is till in this thread but the issues continue. All my frames are .Cr2 and I took 20 frames of each calibration.
When I do a histogram stretch of my data it looks like my calibration frames are not aligned with my image.

[thin orbit]

Having same issues sorta /: may i ask what scope u use?

[opaque cradle]

William optics z61

[thin orbit]

Do u take flats with a panel or ipad or with daylight in the morning? So far ive found that my flats seem more effective with daylight flats

[opaque cradle]

with Ipad

[thin orbit]

If possible try it with daylight flats? Theres a chance it could work like that

[opaque cradle]

Ill try that. Quick question does this look like walking noise? I dithered so now Im thinking all my calibrations frames are off

[thin orbit]

For what i can tell it looks like it a little maybe dither more if possible but ive not had walking noise so im not that great with knowing or not 😅

The only other time i had this pattern is when my camera temperater was different with darks and darks with 2 min not 5 min

[opaque cradle]

I dither every 3 frames (5 pixels) and I m only exposing for 60 seconds. I have been doing this for a bit now without issues. I guess I'll dither 10 pixels next time

[thin orbit]

Yeah its worth a shot but if not then my best guess is something else with calibration frames

[opaque cradle]

didnt work

[thin orbit]

Yikes XD guess we are both stuck with bad flats

[opaque cradle]

Broken flats gang