geeklee

Excellent contrasting pair Adrian. It's interesting seeing the Iris pop up already just before the light nights of summer. Very nice colour and detail in the core against an attractive star field. I just need to get all that dust off my desk from the IC1396 image, it's covered in it

Fantastic result Chris. The slightly smaller pixels of the 585MC shining through in this combo to give the tools more to work with.

Excellent Steve and very clear interaction and structure showing with the data so far. Nice subtle colour too.

Fantastic result - good colour contrasts and lovely detail. No wonder you're pleased! 👍☺️

Thanks Colm, good to hear from you. With weather and a few other things getting in the way, it's only been the last 6-7 months I've had a chance to really get it going - hoping to stretch its legs further later in the year (still have a couple of unfinished projects from this year too). Thanks Roy ☺️

Not at all Chris, all good 👍 👍

Apologies Chris, I'm dropped you a PM instead of continuing the SY spacing stuff here.

Do you compensate for the filters though? At 44mm (like a DSLR) it will focus (on stars) under the "L". If you add a filter, you need to add more spacing so it will then naturally push the focus point back under the L to compensate for the change in light path (due to the filter thickness). I realise we all have different standards & quality measures though 👍

The lens won't go round to the infinity marker (it will go under the "L") but you should always compensate for the thickness of the filter - the fact its broadband or narrowband should make no difference (very very slight filter thickness tolerances aside). It's like spacing for any scope, you need to get it right for the best results.

It's compensating for the short backfocus while focusing at infinity, but if you think of the lens as a DSLR lens then the spacing from the back plate should start at 44mm (like all DSLRs - it's the distance to the sensor). If you're short, it'll focus at infinity before the L, but still focus. If your DSLR was attached, you'd see it focus just before infinity marking (under the "L") for stars. BTW, that's a cool adapter system you have to mount the lens. Here's mine - Camera (6.5mm), EFW (20mm), Spacer (16.5mm), Baader aluminium ring (1mm) = 44mm (+ extra spacers for 1/3 thickness of filters). I'll tag @Adreneline as I think he may have a photo of his DSLR attached to the lens and focused on stars. EDIT: With the 585 sensor, you may get away with just getting it very close to the L, like just 44mm (and maybe a little for filters). The issue is trying to get it spot on while retaining room to auto focus. Too much spacing and you'll never get focus (as I found out the other week!)

Fantastic result Oskari - nice background, strong colour, detailed and clean transitions from background and faint arms. I like the contrasting colour of the core too.

It's tricky - aim for the typical values and go from there - 44mm + 1/3 filter thickness. General consensus is aiming for the focus point to land under the "L" on the focus ring. 0.1mm spacing makes a huge difference. I've just got my Samyang rig hooked up again (just in time for everything disappearing ) and had some comedy spacing challenges where I'd forgotten just how much small spacing changes affect things. Definitely worth checking Astrobin for anyone using the same combo with the filter(s) you're looking at. If you'd like a go in AstroPixelProcessor, PM me a link to the files and I'll happily try it there.

Two great results Chris. Great colours in the first especially still showing the contrasting blue in and around the Cone. Nice one getting the Samyang piggy packed so it could take part and double your options/output!

I believe the ideal approach is to resample (bin) first in software while linear then start processing. Sometimes I'll process and then slightly resample at the end if I feel like the image scale isn't really adding anything or I could clean it up a touch with no real loss of perceived detail. In PixInsight I use "IntegerResample", in case it's called the same in Siril. Yes!! You should have a lot of fun with this lens. I've just been playing with mine again these past few days while under a big moon (I'd retired it for a while). Looking forward to seeing your output from this lens.

That seems pretty decent Vs value of camera. Hope you get a good outcome - it sounds like there's every chance of a sensible repair cost, making it all worthwhile.