Thanks for the reply.
I've found that exact info on the web after your reply:http://www.autopano.net/wiki-en/index.php?title=Special:Pdfprint&page=PapyMerlin_FAQ
There are two versions of the Merlin mount - which we call the 'Non-GoTo' and the 'GoTo' versions.
The Non-GoTo version was the first to be produced and is the version we recommend for use with Papywizard.
The GoTo model was introduced later. It is more expensive, and when first introduced it lacked the camera
control port found on the Non-GoTo model. To use this original variant of the GoTo mount with Papywizard you
have to use of a special version of the Bluetooth module from Teleskop-Austria which provides an independent
camera control port.
Now it seems that Skywatcher, who makes all these mounts, has had a change of plan and from now on the GoTo
version of the mount will also have the built-in camera control port.
The only differences now between the Non-GoTo and GoTo versions of the mount are that the GoTo version has
the more advanced GoTo hand controller, and lacks the 2.5mm-2.5mm camera control cable (which is supplied
with the Non-GoTo version). So with the latest variant of the GoTo mount you no longer need to have the special
Bluetooth module from Teleskop-Austria for use with Papywizard.
So the merlin heads are equal. Now which head should I get for my needs? What about the digital encoders?
The load they can bear seems to be the same:
Skywatcher - MERLIN SynScan AZ Goto Table Top Goto Mount
4 kg load
Skywatcher - AllView Mount
4 kg load