Oldfort

9 hours ago, FLO said:

Others have found the same so we recently added this note to our product description page: 

* Some customers have found William Optics' Vixen style dimension a little too narrow for their mount's saddle so you might need to fit a different dovetail. 

HTH, 

Steve 

What I have found is that the jaws on some vixen style clamps are too deep (eg on the Baader clamp) so that the ridge on the top of the redcat bar gets in the way, and cause the bar to ride up a bit.  But other clamps, eg the standard clamp on a skywatcher AZ-eq5 or the ADM dual vixen/losmandy clamp, are a bit shallower and don't have any problem.  The redcat bar is also  about 1.5 - 2mm narrower than another vixen dovetail bar that I have.

On 07/03/2019 at 09:51, John said:

I think the 28 inch might still be at Greenwich Chris ?:

https://collections.rmg.co.uk/collections/objects/11094.html

I visited the site around 20 years ago and it was certainly there and in use - I have the photos somewhere to prove it !

Maybe it's mothballed currently ?

It's still there, and open to members of the Flamsteed Astronomy Society (and maybe other).  There are viewing nights from October to March (I think).  I don't think it is used for research these days.

4 hours ago, happy-kat said:

That's the same as my findings using it straight through with the rear section attached. Though I don't have a spacer so was testing using hand held eyepiece. I'll have to rumage around to see if I can find something I can use.

Something like this @Oldfort do you think please? Link here

Yes, that's the one I have used.  It weighs next to nothing.

For visual use, straight through, I have found a 15mm spacer works great.  This is with a televue 32mm plossl, or 19mm panoptic.  Inevitably, the skies have been obscured since I got all the bits.

Beaconhill do them in aluminium.