[TechnoBill]

Originally Posted by graham.hobart

I recently purchased an Orion ED 110mm APO because I miss my TAK so much !!
Anyway, the focuser is pretty good on it and is supposed to be viable up to 7kgs.

The colour correction I am unsure of as I am getting blue fringing in long exposures with the OSC camera- I don't think narrow band would an issue.

Hi Graham, What I have red is that the faster F/6 with ED glass causes more blue fringing. Like you I am not sure how that will affect my Narrowband imaging. I don't know if the blue will affect Oii bandwidth.

Originally Posted by Larryp

If you want something really good, then Stellarvue might suit you. They are optimised for photography, and have superb colour correction. There is no local dealer that I am aware of, but the company in USA is really great to deal with.
As Bo has said-Takahashi is superb, but very expensive!

Thanks Larry, I always worry about buy expensive items from OS. They only seem to have one scope within my budget and also I am trying to get something faster then F/7 for the extra wide view.

Originally Posted by traveller

There are a few members running North Group APOs (Chinese made). From what I can hear, they are good at colour reproduction, but have sub standard focusers.
Of course, Taks always have a special spot in many people's hearts
Bo

Hehe Taks ooh yeah. If I could get a 110 tak for 2k I would, I dont think I can get the focusser on my budget :-)

Originally Posted by Larryp

Hi Bill
My experience of Long Perng ED doublets is that they have poor colour correction. The scopes are well made from a mechanical perspective, and Long Perng actually manufacture many of William Optics scopes
I have no valid opinion about the quadruplet, but the doublets would turn me off, anyway.

In regards to Colour correction, If I am doing narrowband, would that play a big part in it? I am not sure. I dont really know what bad colour correction is. I should do more research.

Originally Posted by AG Hybrid

The Orion 110 ED is such a good looking scope.

Mmmmmm Yes it has all the features I want. Except blue fringing :-)

I get the feeling I might just upgrade the focuser on the ED80 for now and wait. But waiting argh I have the Astro urge now :-)

Thanks All.