DaveS

I would like to see a Hydrogen Balmer filter passing the H-alpha, beta, and possibly, the Gamma line as well. This would enable OSC imagers to add the HII regions of galaxies in something like their true colours, which isn't bright red. It would also give mono imagers more signal to play with.

This is a framing check I did on HCG 44. 12 x 300 subs with I know not what filter. The sequence specified Lum, the FITS header says Blue, but the Lum was in the light path when I took the train off the telescope for cleaning prior to getting keeper Flats.

The only nasty stuff I can see are dust bunnies after calibrating with a Master Bias (Recommended in the SX 694 manual)

This isn't for keeping BTW, in any case the moon was stupidly (My stupidity) close leaving a huge gradient.

I have a TG 365 cover over one of my rigs (The other is in an obsy) and find it very good.

A couple of points though.

It's worth getting some rope to tie round the cover in such a way as to prevent it from blowing off in high wind. Been there a couple of time, in one case I had to go out early in the morning in just my dressing gown to rescue a soaked telescope after the cover blew off in a storm.

And if you can run a mains lead to the mount arrange an electric pet bed to go under the cover to provide gentle warmth that will keep condensation off.

Yes, quite possibly.

I'm not sure. I realised after I posted that I had the CCTV camera on, pumping out a flood of IR, plus I think I have identified a power supply issue, with a slightly loose connecter which I have changed.

I ran an all-sky pointing model last night and didn't see anything untoward (Apart from moonlight noise) and did a framing check sequence on HCG 44 which likewise showed nothing unexpected.

"Open the observatory dome HAL"

"I'm sorry Dave, I can't do that"

"Why not HAL"

"Because it's raining Dave"

LOL

OK, the vertical streak looks like blooming, though I'm not seeing any saturated pixels in the histogram.

Two (Very slight) positives are that my guess at the focus position was pretty close, and those diagonal shadows look to have gone.

Last night I was running trials after putting my very old SX Trius 694 on the ODK 12 for capturing some of the HCGs (0.46"/px. Yep, barking lol).

Well, I didn't get very far, due to several reasons but this may be the deal breaker.

A single 1 sec Luminance sub at -25C (Beta Geminorum used for Synch)

And this horror is an autostretched version after Bias calibration.

I've never seen anything like this from this camera, so have no idea what's going on. I just hope that I don't have a dead camera.

Well, I've just ordered a new workstation to take over from my current Charles Babbage steam powered jobby.

Ryzen 7950, 64 GB RAM, 1TB and 2TB m2 SSDs and a Nvidia 6GB RTX 2000 graphics card. Possibly overkill at the moment but I want to be set up for any increase in hardware requirements without going mad with Threadripper or seriously expensive GPUs.

the case has room for more conventional SSDs or HDDs (Remember those?)

It's been resolved. 

On 02/02/2023 at 09:35, ollypenrice said:

Also, plenty of giant professional telescopes have slow F ratios but capture images in astonishingly short times. That's because they have large pixel cameras in the back. What matters is not the F ratio but the flux per pixel - which goes up if you bin your pixels or use larger ones.

Olly

 

For illustration I present Stephan's Quintet. Single 2 min subs in RGB From the Liverpool Telescope on La Palma. 2m mirror, f/10 but effectively 30 micron pixels and 90% QE.

Plain CLS filters are mainly for visual use so don't have to cut off the IR, but CCD / CMOS cameras have a significant sensitivity to IR so it needs to be blocked otherwise image bloat will occur.

A quick 2 hours on the Intergalactic Wanderer. Just given Dark Frame calibration and a humongous stretch.

The diagonaal shadows are gone, just need to get some Flat Frames , and give the filters a clean..

Many thanks to @Oddsocks For identifying the cause of the problem, otherwise I'd be no nearer the solution.

This is the FoV with the Gsense 4040 on the 0.7M RC, again using Copeland's Septet as a reference

And just to show that you don't need a big RC to get a narrow FoV, just need to be totally barking. My ODK 12 with my SX Trius 694

Many thanks for the link to that blog, yes figure 8 does look horribly familiar!

Unfortunately OOUK only make telescope, they don't actually use them themselves, so egregious faults like this go unnoticed. Their "Customer Service" is notoriously poor, so perhaps customers just aren't bothering to report the issues.

It also begs the question of how the hell could orion Optics supply a high end, expensive OTA with defective-by-design accessory components.?

I bought some matt black (RAL 9005) paint and treated the Orion Optics spacer and 82mm-68mm adapter. It's not as black as I would like (I have some Black 3.0 on order) but an initial Bin 2 hydrogen flat looks promising

Calibrated with Dark Flat and Bias, given a light linear stretch.

OK, this is the sky view. It's just above Leo's backside

And the FoV in my ODK 12 / G3 16200 ( A fair sized 'scope by amateur standards)

Here we go, Copeland's Septet in your 0.7M dia, 8.4M fl 'scope

Well, I wouldn't want to *shoot* anything, but I might try imaging some of the smaller HCGs. Stephan's Quintet might be high on my list.

Well, if you * really* want a 6x6 cm sensor..

https://www.baader-planetarium.com/de/kameras/qhyccd-kameras/wissenschaftliche-kameras/qhy6060-bsi-fsi-cooled-scientific-cameras.html

Be sure to be sitting down before looking at the price !

Having a look at the Astrograph site I saw a couple of very interesting cameras based around the sony IMX 461 medium format sensor

From QHY bundled with a 7 position FW and OAG

and Moravian with integrated 7 position FW.

No, they're not cheap but not as pricey as the ZWO version, and better made, by the looks of things.

Would make a nice pairing with a Tak FSQ106

I'm not sure how well it's showing on here, but in the original FITS on my 32" 4K monitor I can see a few knots of structure in the outer rings. Whether those are genuine galactic structures or foreground stars I'm not sure.

Indeed. It's also made a bit of a mess of NGC 1055.

Following a suggestion by @geoflewis on our WA group I applied a touch of Levels and Curves in AstoArt.

I don't know, it's made the outer ring of Cetus A a bit noisy. Need more data!