Tim

LOL! How true in so many cases!

Me too!! Are you at Kelling this year Carole? Be nice to catch up, I saw your camper last year I think but didnt see you

Not sure if anyone has thrown this particular spanner in the works yet, but there are very few refractors that have such perfect colour correction that there is not a bit of star bloating from not quite precisely focused colours being captured during a Luminance sequence. Faster 'fracs are the worst offenders normally, and it isn't always a case of the more expensive, the better. Take Vixen's VSD100 as an example, Luminance subs through that lens were pretty much impossible to get tight focus on when I used one, and as was stated in the offical S@N review too.

^^^ This ^^^

What telescope were you looking to use it with btw?

Nebulae imaging? Mono camera with narrowband filters - no brainer I have both ways and each have their uses, there is very little crossover to be honest. If you are lucky enough to image with a scope without CA, then OSC can be useful for our rubbishy UK skies. If I was to just choose one, then it would be a mono, for most versatility. But OSC certainly have their place. Just my $0.02 Tim

That's good news. I just drove past the pub we went out to last time FLO did a local (to me) show and was thinking about it. Ted came from Borg too.

21mm Ethos. No, 13mm Ethos. No, 10mm Delos. No no no, 21mm Ethos definitely. I think.... erm....... hmm, not sure.....

We'd all like it Michael Might struggle to pass this as "allowable expenses" though

Have you looked at the ASiair? If the ASI1600 is compatible, and I havent checked, you can run both cameras from that, plate solve, link to Skysafari, and generally do away with a laptop......

This is excellent news! Can't tell you how pleased I am to hear this, for both parties. Congratulations FLO and Ian. Tim

How about bigger? The new WO 126 looks promising, 970mm focal length

Hard to say, looks like a planet with moons. The swirly bit is where the camera moved

Following this thread with interest At least from the White Redcat you have equal effects of coma, and it is not too awful. It's a shame there isn't a way to get software adjustment suitable for each telescope and camera, the same way you can get software adjustments for Canon lenses for example. Out of interest, is the coma worse if you focus and image via a blue filter? Use a central bright star to focus and then nudge the same star to the edge of the field and try again. This will also demonstrate the extent of any focal shift. If you have parfocal filters it will demonstrate how "apo" the scope is too. Luminance filters are a compromise in refractors, there is nearly always a bit of deviation in one of the colours, usually blue, even with fluorite lenses. Cheers Tim

How long will the promo run Steve? I need to get me one of those there ASiairs

This is brilliant, great colours and processing, you must have enjoyed some lovely dark skies for this

Having used most variants of scopes for imaging, I would suggest an RC is perhaps not an ideal starter scope. There are so many other things to get right, you dont want to be mucking about with the scope too. Hard to beat a decent refractor for starting out with AP.

RC telescopes are generally better for photography than for visual use, the large central obstructions reduce the contrast at the eyepiece. Colliiating them can be the devil's own work, but once properly set, they can produce excellent images. There is a review of the Omegon RC telescope in a recent Sky at Night magazine.

Thanks Stu. I have just read the review to see how much resemblance it bears to what I wrote The editors, bless them, missed off a crucial detail. The part about the star test, should read: Italics reveal removed text. Without it the sentence is meaningless. You'll have to buy the magazine for the full review Or do a "John" in WH Smiths.....what a nerve

Latest S@N magazine has a review in, including details of how the scope performs photographically. I'm still on holiday at Kelling so haven't got my copy yet at home, but I noticed it on the newsagent shelf yesterday.

Good move FLO I wonder though, how many observers would have been more than happy with the first scope John received? I have attended many star parties where people are joyfully observing through equipment that has been poorly collimated, with sub-standard views, but they are more than happy with what they see. I usually pass on commenting about the collimation, unless i'm asked. I still wince over an episode at Kelling SP once though, when Es Reid was examining an 18" mirror I had from OOUK that had terrible astigmatism. I always collimate my newts with the Cats Eye tools, they are expensive, but worth it for the last word in collimation. After we had been dodging around the sky a bit, star testing, Es just mentioned, in passing, "your collimation is a bit off...." Aaaaarrrgh! My eye is twitching even thinking about it! Is there an ETA on the new scooe for John??

Me too, me neither!

I fear for this thread now, the scope is on hold, the weather has turned cloudy, and the mob grows restless.... but if you cant beat 'em.... Even when they are asleep? Half of my wife is Welsh, but it is ok because the other half is Scottish. Imagine Catherine Zeta Jones making deep fried mars bars and you pretty much get the idea

Perhaps not so much a secret as much as irrelevant to most purchasers? I also have no idea what type of glass is used in my Televue eyepieces, but I know that they work well

The list price for the 150ED is £1699 on OVL's website IIRC. So actually, a buyer would still be 4 quid better off