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Thank you all.
I assumed that all the three mounts can be guided, and this is what I am going to do with the second refractor. The PE I understand it is much bigger at HEQ5 and EQ6 than at Vixen. This will impact the time you can take a picture with no guiding at all. From this point of view the Vixen mount will allow you a longer exposure without guiding. Except for the new released model, Vixen was not having PEC. Another astrophotographer told me that PEC is not easy to use, less reliable then guiding and conflicting, if activated, with the guiding. As a result I thought that is not a must. I must admit I do not know much about the backlash.
Vixen looks better and I am sure is also better quality, but is over 30% more expensive than HEQ5, takes less load than the EQ6, and the GOTO system doesn't allow you to enter coordinates and I think that this is a disadvantage.
Usually you don't buy the best quality but the best value for money. What would you buy in my place and why? The ultimate goal for me is to be able to take good pictures of the sky. Are there any issues with the above telescopes that will make them unsuitable for astrophotography?
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