Space Cowboy

5 hours ago, Kon said:

I have personally found that during daylight captures I can go down to 3ms with a gain of ~400 (ASI capture), probably 80%, but as it is getting darker (maybe correlated to poor seeing/transparency) I have to up my exposures to 8-12ms to get my histogram 70-90%, not bad but fps drops quite a bit. At daylight, I tried to lower my gain by increasing the exposure but I found the images noisier. I do not image at dusk/night anymore.

(my images are at f15)

I suppose the three of us are using different filters wit different transmission that will affect the exposures.

I imagine fast frame rates are your main priority considering you don't have tracking Kostas. Its easy to forget that when seeing the quality of your images.  I'm not keen on daylight as my shroud is only a camping mat so the strut ends are still open to the daylight.

I believe you are the odd man out regarding the UV filters. I have the bessel U the same as Neil. Once again you are performing miracles with a bargain filter. 😉

5 hours ago, neil phillips said:

That camera chip although smaller. leaves my 178 in the dust judging by what you guys are finding

From what Christophe pellier has been saying it has no rivals in the UV stakes.

27 minutes ago, neil phillips said:

My 178 is on  30 to 60 FPS 90 to 100% gain.  

Interesting to compare. The fps was actually 65fps for the over sampled run and 81 for the smaller undersampled captures I took. Looks like the goldielocks zone is in the middle. The nose piece I screwed on so i could remove the cover glass and attached the UV filter threw off my fl from the 585c.

These are the 2 sizes straight out of registax and their capture details. The f ratio quoted by FC is not correct.

2023-05-29-1946_3-SJG-L-Ven.txt 2023-05-29-2001_2-SJG-L-Ven.txt

1 hour ago, Kon said:

Looks great and nice fine details. What sort of fps are you managing with the new camera? At daylight I manage 300 at 640x480 (~3.2ms exposures) for a histogram of 70-90%.

Cheers Kostas! I didn't go mad with FPS. Had gain just below 50% so FPS was about 80-90 at 60% histo. I'll post up the capture details later. Sky was a bit hazy 

2 hours ago, Space Cowboy said:

Quick false colour process from last night combining my new QHY462mono & colour QHY585 :

The live view of the 462 looked like a stacked version of the old QHY5L-ii.  Seeing was once again very stable.  The 462 uv image used here was oversampled probably f20. Need to get the f ratio right.

 

 

 

Thanks Neil. The UV was using Gaussian wavelets.  I reckon the 462 is about 5x more sensitive than the old qhy5ll.

Quick false colour process from last night combining my new QHY462mono & colour QHY585 :

The live view of the 462 looked like a stacked version of the old QHY5L-ii.  Seeing was once again very stable.  The 462 uv image used here was oversampled probably f20. Need to get the f ratio right.

16 hours ago, Kon said:

Looks great and subtle.

Thanks Kostas 👍

2 hours ago, neil phillips said:

Can easily see the rill its a excellent capture and process

Thanks Neil. Plenty of data collected for those weeks of cloud lol

Processing 4k colour images is putting my laptop and pc to their limit. I've got a full crescent mosaic from the 25th in the pipeline but for now here is a single capture from the 27th.

Auto Dob 250 & QHY5-iii-585+ext+adc+2x ultima= f17

Love the mosaics especially the 1st.

Terrific detail on the oversampled shots especially the rille in the alpine valley but personally prefer the cleaner more natural mosaics.

Certainly looks like you're having fun in this weather Neil. 😉

UV/OSC false colour :

2 minutes ago, Ibbo! said:

Looking forward to the images.

Where did you order it from?

Modern astronomy:

https://www.modernastronomy.com/shop/cameras/lunar-planetary/qhy-lunar-planetary/qhy5iii462m-mono-camera/

7 hours ago, Kon said:

Looking forward to your images with the new camera.

Thanks Kostas. It will be nice to not be spending 90% of processing time dealing with noise 😉

8 hours ago, neil phillips said:

Sweet capture. Congrats on the new arrival, bet your itching to see what it can do. Lovely chip

Thanks Neil. Yep, certainly looking forward to it 👍

2 hours ago, Kon said:

Very nice. Good to see similar features to what I got.  I think we are spoiled by this nice weather. 

Thanks Kostas. New 462 mono has arrived so this will be the last Venus with the noisy old cam. Can't believe this weather!

Very good again!

Quick process from tonight. Good seeing again.

Finally got around to finishing a repro :

That's a beauty! Reminds me of one of those power balls I had as a kid. So fascinating how the cloud structure changes in texture and contrast.

3 minutes ago, lukebl said:

I struggle with focus too. I just focus in and out till it looks about right. Nothing scientific!

True, it’s getting larger, but as it becomes more of a crescent there’s much less to see! Very frustrating.

Yes, the next couple of weeks look like the sweet spot before the crescent becomes too pronounced.

17 hours ago, Kon said:

Mine looks similar but I bring the noise down with the Denoise (0.1-0.2).

I've been experimenting. Not keen on using too much noise reduction. Ive got 17 three minute runs from this night all very similar quality as seeing was so stable. Ran the 17 stacks back through as3. Obviously there is no planetary rotation only field rotation but at this elevation it's not much. Results aren't bad but I'll try derotation of video (purely for field rotation) and also derot of images. 

That tree is crying out for a laser cannon. Damn it!

Nice capture even so Neil.

Nice capture! Seeing has been very good this week and Venus getting larger too, so it's all good 👍

Cheers Kostas!

Just to show how noisy these images are this is the UV straight out of registax after dyadic wavelets. 25% stacked from 9 min consisting of 8500 frames.

1 hour ago, neil phillips said:

looking good lots of fine detail. look forward to the repro

Thanks Neil. It's seems shooting in broad daylight is making noise worse. This old cam is doing my nut lol Got 40 mins worth from 35 to 25 degrees alt. 

I shouldn't complain too much as I know there are people with tree issues 🙂

Btw checked collimation and it was still spot on despite the kick!