M27 - 2h40

[pallid flume]

📷 Camera: ZWO ASI 585mc pro

🔭 Scope: Quattro 150p

⚙️ Mount: Celestrong cg-5 goto

⏱ Exposure: 180s x 50

🌌 ISO: 200

🌇 Bortle: 7

🖥️ Processing: DeepSkyStacker, Siril, Starnet ++

Thanks @vital moat and @dense obsidian for the great advices

[keen river]

I just got the 585mc pro, great camera so far.

[pallid flume]

Yes love it, at what iso do you shoot it ?

[keen river]

I shoot at a gain of 240, not sure what that translates to iso though.

[pallid flume]

ah yeah gain I mean

I saw that the chart is showing a read noise reduction around 250 so maybe I will try to shoot at like 255

just to make sure I benefit from it

[sharp saddle]

use gain 252

same with you @pallid flume

iso and gain arent the same btw

[sharp saddle]

thatsd what a lot of people use ive seen

I use the 533mc pro at gain 101

[pallid flume]

Ok will try that

And reduce to 120s subs maybe

[keen river]

Thanks.

[sharp saddle]

yw

also when ur processing

dont clip the blacks

good tip

[pallid flume]

clip the blacks ? what does this means ?

[sharp saddle]

Background is way way too dark

Therefore your cutting off tons of signal

[pallid flume]

Oh yes ok, at what steps should I care about that, at the end during the histogram transform ?

[sharp saddle]

dont let ur data reach the very end of the histogram

data spike

[pallid flume]

Thx for the advice I tried that on my todays shot

[sharp saddle]

yw

[ashen lion]

great scope and camera.
get some more integration time.
This is what 100 hrs of narrowband looks like on M27
533mm

[pallid flume]

That’s massive beautiful in what bottle did you shoot @ashen lion

[ashen lion]

B4.5

[sharp saddle]

how do u get decimal bortle values 😭

[ashen lion]

@sharp saddle

https://www.cleardarksky.com/maps/lp/large_light_pollution_map.html

[sharp saddle]

oh thahks

thsnksd

thanks

[keen river]

How did you calculate that 💀💀💀

[ashen lion]

@keen river ???

[keen river]

B4.5, I had no clue that was a thing.