Elp

I assume as per usual the prices listed are without tax as it's a state variable added cost?

I find there's around one week, maybe two of heatwave-ish weeks, this is summer nowadays. If you're lucky you can get three to four sessions in one week. I generally image all year round, but the summer early morning packaways can grate if you're a sleepy type.

Once you go SCT with its FL flexibility you start to wonder why keep the medium to long FL other scopes.

Very true. The Skywatcher ones also look good especially the Wave100 which you can dual mount for alt az use, can also track 10 Deg to keep satellites in view. Performance is unknown until people get them in hand.

I'd do a test without filters, then try a few different ones. I'm thinking a bodied camera has a few pieces of glass mounted onto the sensor, with the 2600 you may have less though this doesn't explain if you have MF capability why its still causing coma at the edges. I find with my SY135s, if I keep the backspacing consistent, different filters will move the focal point away from the infinity point on the lens significantly.

Lots of reviews online if you search, they are one of the major USA astro suppliers.

It never occured for me to ask but does that AF lens have manual focus control when not connected to a camera body?

The starless image will have noise regardless so there's no issue cleaning up a stretched image as they'll be noise everywhere anyway.

Most companies use delivery terms Delivery Duties Unpaid (DDU) so the buyer has to sort out the payment upon importation.

No but you can calculate additional charges quite easily. If importing to the UK the vendor will normally charge 20pc VAT which is remitted to the courier company to pass onto HMRC upon importation. If not then the courier company will ask for this 20pc when the item lands in the country. Note the 20pc applies to item price + shipping. Import duty applies to items higher than 135 which includes shipping cost as part of that 135 limit. The seller should be able to advise you of the export commodity code or Harmonised System (HS) code which you can cross reference with the item description on the gov website to see what pc if any duty will apply based on the item price. Commodity codes are mandatory as part of exporting goods so the seller should be able to advise. If the seller doesn't use a prepayment system and take the additional costs at point of sale (POS) then you'll pay the VAT+Import duty to the courier company handling the importation once the item enters the country and clears customs. You'll have to pay the additional costs before they release the item to you for delivery.

I don't think you can. Why not just stretch it and clone stamp that image. I always do the cleanup after stretching.

Depends on the individual. If someone say buys a full frame sensor camera, they're going to want the full frame looking good. But me personally, I think defects such as lens issues, noise etc just shows that a person took the image via their equipment, completely smooth images look unnatural to me for example, all digital media generally has noise due to how electronics work.

Have you got another astro camera you can try with the lens adaptor? I know the size won't necessarily match the 2600 but you'll likely start to see the distortion if it's a decent sized sensor, and if it reproduces the issue. Process of elimination.

Or do what I do, just crop it out. You can drive yourself crazy trying to fix tilt. Cropping suits me because I setup and breakdown pretty much every session so it'd be a futile exercise for me. It presents an issue if you want to do mosaics, but then again just use a larger overlap to mitigate it.

If you've got the equipment at hand you'll generally get a result, I did it on my first attempt with a 60mm refractor, barlow, but I was using a 224mc camera, its a popular plantery camera and doesn't cost much, in fact it's very cheap now compared to its original price.