Deadlake

ok, you've got me.

Interesting for the moon I have a polarising one, change the amount by rotating it. I'll look at the Baader ones. Any filter suggestions for Jupiter?

For cooling it's the air in the gaps between the lens which acts an insulator, hence air space triplet will take longer than an oil spaced cell to accumulate. AP state for oil triplets don't go below -25 oC as this can cause issues. @jetstream knows more on this subject. LZOS (and I think Tak, Stellarvue in newest models) use steel based cells as it has better thermal properties for a lens cell, you don't want the cell to pinch the lens. Oil based triplets will cool faster then air based ones, but you need to be careful in the temperature range. @Tyson M mentioned a good plan is to store the APO in a case when bringing them in so they have time to accumulate to indoors, instead of a temperature shock.

Looking up, according to Starman: The TeleVue BandMate II filters are current since 2018. Their older Band Mate filters were wider in bandwidth and discontinued several years ago. TeleVue BandMate II filters are made by Astronomik, but, as you note, the TV Nebustar (their UHC filter) passes no red, while the Astronomik does have an output in the red at the H-α wavelength. The DGM NPB (their UHC filter) passes a very broad swath of wavelengths in the red, so stars appear red. @jetstream is it worth paying the extra for no red with Televue?

I’m going on what a dealer told me, however working out fact on the internet is always hard....

I've ordered one of these: https://www.firstlightoptics.com/filter-wheels/manual-5-position-filter-wheel.html I'll also get a 2" version as well. My thoughts are the 1.25" filters will be for planets, whereas 2" will be for nebulae etc. I did look at the Baader UFC (slides) as well but add £36 per filter, plus the slide holder of £45. When a 5 filter wheel is around £60-70. Only issue might be back focus, will see where I get to with the 1.25" wheel first and report back. I really will not mix planet/DSO viewing and the cost of slide outs (possible dew issues) is a lot more. OIII looks interesting, looking at prices as a lot of products are creeping up in price.

Great handles??? 😀 PS: I'm wondering if @JeremyS is going to beat me to this punchline...

I have Bosch too, very good. Only issue is the brushes going and not having time to replace them or get someone in due to the pandemic. I should of specified telescopes being built in the same factory in this case. Presume Maytag and Bosch are not, but a lot of telescopes are.

Yes, skywatcher 120ED for instance. Lots of praise and good test results.

I suspect APM's reputation from LZOS has been used here, but in someway I'm not sure APM FPL51/53 scopes are any better then Skywatcher etc, given the price and manufacture. As an aside for instance most diagonals are made by United Optics or GSO (Baader being the exception). However all the diagonals have different specs, from the same production line if you test them you will see different quality. At the end just left with price to tell us if any good all other things being equal.

It was designed by Thomas Black, I would not call it a clone. For telescopes I cannot think of any cloning, with the exception of Sharp Star copying Tak in the astrograph mirrored market. However most of the cloning is the copying of Vixen and Tak mounts, thats for sure. You get what you pay for. Skywatcher and Optron are now going off on their own trajectory however...

Let's say it came up while discussing buying a LZOS scope and would it also work with NV. I thought Jeff's scope was LZOS when its not.

TMB 130 F7. This is one of the earliest Chinese made scopes from United Optics that was made for Thomas Back. Unless there are other TMB 130 F7 out there... Thomas was partners with Markus at APM for the ‘TMB Apo’s using LZOS lenses, but TMB branded Chinese scopes are not related. They were a separate business that started and eventually closed after Thomas died. Jeff Morgan has one, he had some great NV pictures. LZOS are better and more expensive, the TMB is better value for sure.

I wouldn't be put off by this, if you have one scope a 100 mm refractor is the one to have for many reasons. I have a ADM mount and extended vixen dovetail now, I can give it another go when the moon next comes up. Not been using the ScoepTech as much due to having a new SXP2 mount to use. When I was mentioned high magnification I meant 300-400x, around 200x will be fine.

SXP2 needs to be aligned near Polaris (which polar align App does) and then two star align is good enough.

Yes, however the star book makes going over the moon vibration free at the EP great, unlike my Scopetech. Also tracking Jupiter, very easy. An AZ100 with motors is the answer, however the star book is such a great controller.

You place your phone in the puck, then using daytime align you can move the mount so it's aligned as close to Polaris as possible using a direction indicator in the App. Useful if your neighbours tree is in the way! Star hop looks interesting as no interference from metal of mount with phones gyroscopes/compass etc. I suspect that @JeremySand @mikeDnight can see thru solid matter as so never needed any gadgets to help them... 😄

It’s an engineering problem....

Wheels work with 1.25” filters, unless you go for electric versions. Slides seem a better way to go..

@jetstream do you use a filter wheel, or a holder for the filters. It’s a faff screwing/unscrewing them to the EPs.

Actually meant reflector, but failed at multitasking. C11 would also do...

Don’t you need a 130 mm wide field scope as well? I’m running the argument thru my head I need a CAT (Mewlon) to complement my wide field scopes.....

https://www.firstlightoptics.com/televue-filters/tele-vue-nebustar-uhc-filter.html What’s the difference if any with this? https://www.firstlightoptics.com/uhc-oiii-visual-filters/astronomik-uhc-filter.html Televue graph is truncated above 600 um?

I have a Astronomik UHC, very good. Gave great views of Orion Nebula. Given the weather not had a chance to use it more...

The Mewlon is the best for visual. I suspect the extra aperture of a C9.5 will work better with stacking images.