After one month and a half I've reached my final setup.
I've found a great offer and I've bought 2 Solarmax 60 front etalons, 1 type I and 1 type II.
I've tried both in double stack on my Lunt 60 and I've tried also the triple stack.
These are the 4 configurations:
And the 2 different front etalons:
Both the Solarmax 60 etalons are great for double stack the Lunt 60, even if the type I is easier and faster to use because is has not to be tilted such as the type II (type I is already tilted and it's not tiltable). And it's also smaller and lighter then type II.
The image is very very good with both the etalons, both present a clear but not disturbing banding, but the ghost image of my type II is closer to the Sun then that one in my type I, so in my type I it's easier to put the ghost image away from the field of view.
With the double stack, there is less light so the maximum magnification is reduced, but the contrast is beautifully increased!
In the triple stack mode, the maximum magnification is even more reduced and the contrast is quite more improved over the double stack (not such an improvement like from single to double stack), but I really had to stay low with the magnification because otherwise the image was too dar,k and in this way it starts to be difficult to appreciate the increased contrast of the surface.
Prominences are still there in double stack (just a little bit less defined) and even in triple stack.
At the end I've sold the type II and I'm very happy with my Lunt 60 double stacked with the Solarmax 60 type I; that's my final setup:
Now I'm ready for the transit of Mercury
