Ian McCallum

I inherited a twist lock 2" adapter similar to this, when I bought a second hand telescope last year. It seems to have 48mm filter thread inside, for 2" filters obviously. My question is, can I get a 48mm to 42mm adapter ring to fit this, so that I can use it my SW Skyliner 200P focuser tube, I think that has a 42mm T adapter or something similar on it? That way, I can do away with the focuser tube with the thumbscrews on it.

Isn't that due to copper thefts?🤔

A quick visual only report, as I had mount problems last night. Without the filter, CA was obvious around the Jovian disk. With the filter, it was nearly as good as the view with my 8" Dob.

@Stu A mount upgrade is out of the question, as I've already thrown enough money at this.🙄 If I don't manage to get half decent results with what I have, then at some point I will go back to purely visual observing. I'll sell the cameras, etc. and try to recoup some of the cost...

It might be sometime away, due to the long range weather forecast!🙄

From Auntie @FLO...

Hence my question.😉

Would my SW Skyliner 200P not be too much weight for the EQ5 GOTO mount? The OTA alone weight in at 11kg.

Wow!😲

I don't have many filters, but I've never really tried coloured filters on the planets before. I'm not a big fan of monkeying around with various filters, during a session. I prefer either to stick to the one or none at all. Having said that, I do like to try a neutral density moon filter, with and without on the lunar disk.

I did a little with the image in RegiStax 6... I think yours is better and doesn't have a blue border round it.

I've gone and ordered the Baader Contrast Booster from @FLO, so I'll give that a try (weather permitting).

I've been using a Wratten #8, as a cheap man's CA filter.

I was going by the Inverse Square Law, as in you effectively double the focal length of the telescope and the light levels being received drop to a quarter of what the originally were.

If you look at my signature below, you can see that I already have a SW 200P Dobsonian and a SW Evostar 120 achromat. I also have a friend's 4.5 inch Meade reflector in storage, here in my spare room. I've been dabbling with imaging with the SW Evostar 120, using a ZWO ASI224MC camera, with mixed results. I've been recently trying to image the gas giants with some success, but as expected, I'm having to deal with chromatic aberration from the achromatic reflector. I don't know if one of the Baader range of visual filters would help this situation or not. I see that some people use their Dobsonians untracked, but I'm not sure if that would work for me (or even how to do it successfully). I've been using my EQ5 GOTO mount for imaging, the only imaging I've done with the Dobsonian has been with a smartphone up at the eyepiece. I've been toying with the idea of getting a SW 127 Mak and mounting it on the EQ5, for gas giant imaging. I've also recently bought a 2x Barlow for increasing the size of the target in the camera frame, but obviously the Barlow cuts down the light entering the camera by a factor of four. Should I look at buying a SW 127 Mak or are there other options (less expensive), that I've not thought about?🤔 Ideas are welcome...👍

I've been using a Wratten #8 filter for that, as the filter you mentioned are rather expensive and hard to get, at the moment.

You can see some of the CA on these images taken with my SW Evostar 120 achromat. Coming from a SW 200P Dobsonian, it was quite noticeable.

Would a plastic nozzle connected to a vacuum cleaner, not do the job of removing the leaf?

That was my thinking too, but wasn't sure. I guess the reference clock (or similar) may interfere with other things, causing RFI and other EMC issues. That would also explain why my EQ5 Pro GOTO kit has a clip on ferrite on the DC power lead, going into the motor controller.

I'm curious why the newer board has a toroid on it.🤔

Thanks. I wasn't sure if it was it was a special filter for a certainly wavelength of light.

How do you get the lovely yellow colour?

I just re sharpened your original, using RegiStax.

I noticed it down last night, glad it's back up now.

That being said, I've seen some CA caused by a cheap, plastic lensed Barlow!😱