John

Or this ? - I've no idea myself I think we are into colour crossings here, which is well over my head !

If you click on the "Specs" tab for that particular eyepiece it does say that the apparent field of view (AFoV) is 44 degrees. It is rather confusing that they mention 52 degrees in the "More Info" tab but I think that is a generic description of the Meade 4000 plossl range. It is only the 40mm focal length of the 1.25 inch 4000 series eyepieces that has that smaller AFoV. You are not the first to be confused by this description: https://www.cloudynights.com/topic/462043-meade-4000-plössl-40mm-does-it-really-have-52fov/

In the 1.25 inch fitting, the maximum apparent field of view you can get with a 40mm focal length eyepiece is 43 degrees. That is limited by the internal diameter of the 1.25" barrel.

A few members on here have written reviews and other pieces for magazines so will no doubt have an opinion on that.

I compared the two a few years ago: Where on earth have those 9 years gone

It's nice getting those "2 for 1" DSO pairings NGC2158 looked like a faint patch of light in the outskirts of M35 with my 100mm scope last night but it would have been much more obvious with your 12 inch

If you do that you will not get the benefit of the 2 inch size eyepiece format because the adapter will squeeze the field of view down to what can be accommodated by the 1.25 inch end of the adapter. Also the arrangement of having a bulky and heavy 2 inch eyepiece hanging off an adapter inserted into a 1.25 inch diagonal will look clumsy and could be insecure. As @Mr Spock says, you will need to get a 2 inch fitting diagonal for your scope. These come with an adapter so that you can still use your 1.25 inch eyepieces as well.

So you will need to get a 2 inch diagonal as well, unless you are already using one.

That's a nice and interesting image Sometime back Tom Buckley-Houston produced this composite image which shows what Messier 31 might look like compared with the moon, if we could see it's full extent with the naked eye. I think the galaxy is perhaps a little oversized but apparently it's quite close to being correct:

Yes, that's one that I like too An F/12 scope is never going to be able to excel at wide field observing though. That's why lots of folks end up owning more than one scope.

Often with regards to CA correction, but not 100% of the time though. I've read reports where a doublet that uses an FPL-53 element shows less CA than a triplet that uses a FPL-51 (or similar) element. CA correction is one aspect of performance - there are others of course.

1.55 deg at 45x ?

Another clear half hour here. Despite the blustery wind and the scudding cloud patches, the seeing is really quite steady and the transparency not at all bad. I got a superb split of Alnitak at 225x and I may even have glimpsed the Pup star, Sirius B a couple of times. Sirius A was well defined at 257x with a tight airy disk and a nice set of diffraction rings. Clouds thickened again so I finished off with the Eskimo Nebula (NGC 2392) and it's mag 10.5 central star. Nice Feel better for that !

These are big targets - Messier 31 (Andromeda Galaxy) is around 3 degrees across in full - 6x the apparent diameter of the full moon. The widest true field you can give with a 1.25 inch eyepiece in your scope will be just under 1 degree. If you can use a 2 inch eyepiece that can be 1.5 degrees. That is wide enough for many other DSO's though.

Well that was a surprise - 40 minutes of clear sky ! So a whistle stop session with my 100mm refractor included "the best of" in Orion, a handful of targets in Gemini including the magnificent M35, some Auriga open clusters, the Crab Nebula and a few other familiar winter treasures. And then the cloud came back Short but especially sweet following so little observing lately

With the Skytee II I feel that it is best to put the heavier scope on the side mounting point. If those are the stock dovetail saddles keep an eye on them for thread wear to ensure that they hold your scopes safely.

2 weeks later ...... My most used 3 eyepieces are none of them, due to the cloudy conditions that have persisted since Dave / @F15Rules posted his pic of rainy Lincolnshire But "Clear Outside" is promising me 2 clear nights in the coming week so my fingers are tightly crossed 🤞🤞

The seeing conditions have to co-operate to make using very high magnifications on any target worthwhile. While it is not the highest magnification that I've used, if the seeing is steady then I often find that 300x-350x seems to give me the optimum balance of image scale, sharpness and contrast when using my 12 inch dobsonian for lunar observing. When I use more I usually find that seeing the finest details (eg: the smaller Plato craterlets, the central rille in the Vallis Alpes, small crater chains, floor markings in the Messier craters etc, etc) actually become harder to pick out, despite the larger image scale. So it's about getting the balance right and judging what the seeing will make worthwhile I think. Some experimenting is always fun as well

Congratulations on both milestones Chris Many thanks for all your contributions to SGL - please keep it up !

I know of a a few folks a good decade older than myself who are still regular observers. So well into their 70's and that is encouraging. The best aid to astronomy as you get older though is, IMHO, retirement ! I was able to retire rather early over a decade ago and that has been just so helpful in easing the impact of late nights I do find cold nights off putting as I'm getting older. If there is something special happening or I get an urge to track down a particular target, I'll make the effort and, usually, enjoy the session. Either that or I track down and observe my quarry and then quickly scurry inside to warm up ! As many have said, having a quick to deploy / quick to tear down setup quickly becomes an important part of being able to fully enjoy the hobby as you get older, especially in the UK.

Dobsonian is the design of the mount. The OTA that is mounted on it is, 99% of the time, a newtonian. Any newtonian larger than 10 inches in aperture needs a pretty massive equatorial mount to be a useful instrument. For visual observing, I would stick to either a 12 or 14 inch newtonian on a dobsonian mount.

I've just seen Capella and a couple of other stars in Auriga plus Dubhe in Ursa Major No scope or even binoculars involved - the gap in the clouds was just a few minutes. Clouded over solid again now though. Seems to be the story of the past few weeks here

Thanks. We had to do some work on the image before it can be printed. I'm still learning the terms but basically we had to convert the image to a file which represents the form using polygons at a suitable resolution and then do a further piece of work "slicing" the data so that the printer can print it layer by layer. We had to chop the shape into 2 halves so that it could be printed as a hollow shape with an infill structure that we defined. There are lots of printing parameters that can be set with regards to infill form, infill %, wall thickness and temporary support structure which the printer uses to ensure that the shape is held as it hardens. We could also try using different printing filament types for a different finish. Luckily for me, my brother has been playing with these things for a couple of years now so knows his way round what can be done. It is a big learning curve for me ! This is the work area he has set up with 2 printers that can be working simultaneously:

@Mr Spock has made a logical deduction - it's a magnetic kitchen knife strip. A few quid from e.bay. I had a couple of weights left over from an old telescope mount.

I use a magnetic weight counterbalance approach on my 12 inch dobsonian. The tube is aluminum though so I have attached a magnetic strip to the tube and have a couple of weights that I can use in 2 positions depending on the top end load and the angle at which the scope is pointing - the closer to the horizon, the more counterweighting I need: