You cannot use a 'spacer' to increase the focal ratio with a telecentric. The 2.7x Airylab telecentric can only be increased to 3.5x using an additional lens set which is specially made for the 2.7x. The HaT telecentric was designed so it is just attached directly on the back of the Edge 800. With a...

It will depend on the version of ASI174. The Mini version of the 174 is USB 2 only as its sold mostly for guiding. There is a USB3 version.

I assume you mean ZWO! If you have a problem with three different cameras then its most likely a computer problem. In FireCapture there is a graphic that shows RAM and HDD usage. If the RAM buffer becomes full then capture will be affected. If the HDD is the problem FireCapture would normally crash....

If its a delay in seeing an adjustment then check your frame rate. If you were capturing at 1 FPS as opposed to 50 FPS then you will see a delay

As I said, you have to measure it. Thinking more about it I am almost certain that for the Grasshopper I used a C to T2 adapter http://astrograph.net/epages/www_astrograph_net.sf/en_GB/?ObjectPath=/Shops/www_astrograph_net/Products/AGTST2-CS and a 10mm T2 extension. This positions the sensor (which ...

OK, but where was the sensor on the Grasshopper? Look at an eyepiece and note where the field stop is. Put it in the LS50 and focus. Note where the field stop would be inside the clamp. That is where the sensor needs to be. Does not matter which camera. You can't just suck it and see, you need to wo...

Out of the box, a Lunt 50 is only setup for visual. The scope has very little backfocus. The way to fix the problem and allow use with the FLIR is to replace the T2 clamp on the blocking filter with a shorter one allowing the sensor to get closer. Its a long time since I setup an LS50 for a customer...

I don't think its been confirmed yet but for the refractor you need a telecentric to get it up to F30. Really the easiest way is to use the Baader TZ-4. You will also probably need an extension tube on the back focuser.

One other thing I don't see mentioned is an ERF on the 150.

The Tecnosky and TS 102/1100 are the same scope made by United Optics. There is no ED version as it is an Achromat. It is quite a long telescope and would not be suitable for an M Uno. If you are looking to stock to a fairly low budget then I would suggest the Tecnosky or TS 102/714 ED Doublet. This...

Just a note for people trying to use this collimation method on similar scopes. The GSO RC6 is the simplest version and has limited collimation adjustment. To collimate a Cassegrain format telescope the basic steps are actually as follows; Step 1 - The first thing you must do is collimate the image ...

I would speak to an ophthalmologist if unsure. Your eye does not 'see' anything. Proteins react to different amounts of energy and send signals in the retina. There are so many other obstacles with viewing calcium (like coatings on eyepieces) that its better to just treat it as an imaging wavelength.

Just to try and clarify here. Not all blocking filters are the same and you get what you pay for. The Coronado standard filters don't have IR blocking and seem to deteriorate just through normal use. Lunt blocking filters on the whole seem better quality but if left in an unfriendly environment will...

For the Coronado this is true, its a cheap fix and the replacements are better than the originals which I don't think have IR blocking. I better one still made in europe is about £150. Lunt ones are not so cheap.

It is only replaced free if within warranty and then subject to the scope having been stored properly. Solar kit should be kept in somewhere of even temperature and low humidity, i.e. not a garden shed! Out of warranty the blocking filter is one of the most expensive parts as it is a very narrow ban...

Meade filed for Chapter 11 in December (again) and is probably just trying to generate cash by selling through all product. They are currently selling off lots of products.

Ooops, bit of an error here. The prices should have been

Lunt LS50 with B600 Filter Was £1321 Now £1033
Lunt LS50 Stack Was £1357 Now £1061.50
Lunt LS50/B600 with LS50 Stack Was £2678 Now £2089

That was nearly expensive!

Solar Spectrum is based in the US. An SS based scope is only modular because it uses a conventional scope. If you want to use it just for solar or even Ha there is nothing to stop you. The fact remains the core scope and the filter are better quality than an off the shelf Solar Telescope and price w...

Your Celestron 102 would work well. You would just use it with a 3x telecentric. The only caveat is the quality of the focuser on the Celestron. Because of the length of the optical train there can be a danger of tilt with lightweight focusers. This will cause a system to go off band.

Just to throw my two pence worth in for some balance and perspective. I like solar but as a dealer I am not a great lover of the quality / consistency / flexibility vs price of dedicated Solar Telescopes. As such, while we offer them, I tend to suggest that people consider a rear mounted filter from...

Hot on the heels of the discounted Lunt Calcium, we can also offer the Lunt LS50 and stackable filter at the following prices Lunt LS50 with B600 Filter Was £1321 Now £939 Lunt LS50 Stack Was £1357 Now £965 Lunt LS50/B600 with LS50 Stack Was £2678 Now £1899 Shipped free Scopes do not include a dovet...

Hot on the heels of the discounted Lunt Calcium, we can also offer the Lunt LS50 and stackable filter at the following prices Lunt LS50 with B600 Filter Was £1321 Now £939 Lunt LS50 Stack Was £1357 Now £965 Lunt LS50/B600 with LS50 Stack Was £2678 Now £1899 Shipped free Scopes do not include a dovet...

That is logical Christian. This is more a personal test of my own to satisfy curiosity.

CaK on your C11? Are you using a full cover on the scope with an offset hole? I hope it also has an ERF in it as otherwise that could be very bad for the secondary. SCT's are notoriously bad at passing blue wavelengths due to the corrector plate coating. They don't make the best scopes for imaging a...

The pressure tuned version does not really suffer from any problems. The only one I have seen is where users have unscrewed the tuner completely! Basically the pressure tuner lets you adjust wavelength without sacrificing the bandpass. With a tilt system that is a by product of tilting the etalon. T...

Highbury Mark, that's a shock. It will be a nice combo. I just hope it offers you the increase in resolution you are after. RKBerta, My comment about the TV-85 plus Quark was not right. I forgot the TV-85 was an F7 scope and was think it was F6.3 like the TV-76 is. In the context of your 80mm F6 the...