mak 150 +f/6.3+2"eyepieces

[mario11]

hello

it this combination possible to get bigger FOV observing DSO

i now i need a sct adapter and a 2" diagonal sct's

worth a try or quit

[ronin]

The problem is that a long focal length means that you need a long focal length eyepiece to get a reasonable field of view.

Apparent FoV = EP(fov)/Mag

Using the one you give then Focal Length = 150*6.3 = 945mm

Using a standard plossl as an example:

If you use a 20mm EP then you have:

AFoV = 50/47.2 = ~1 deg.

So if 1 deg is OK for what you want to observe then get one. If you want to see all M31 in one go then you will need a 32mm, probably a 40mm would be better.

If you bought a 68 deg EP then:

AFov = 68/47.2 = ~1.45 deg.

What happens is that everyone than wants MAGNIFICATION, and that stuffs field of view.

[John]

I think the issue is that Maks are just not designed to deliver a wide field of view. High power, high contrast planetary and lunar views are where they excel. You might be better to invest in a fast newtonian for the larger deep sky objects - no single scope can do it all.

M31 is over 4 degrees across (8x the apparent diameter of the moon) so even fast scopes struggle to show it all.

On the other hand the Mak should be OK for planetary nebulae and globular clusters.

[riklaunim]

Note that maks have smaller visualback than for example SCTs as the secondary is kept small. With a focal reducer most 2" eyepieces may show some vignetting. You could try 50-56 mm erfle, symetrical plossl without a reducer, but still it may not be fully iluminated.