Lunt 40mm solar scope vs Lunt 60mm solar scope ?

[Solar B]

I reckon that working at these kind of F 

ratios the contrast will be good even with 

a Lunt but the whole question about 

imaging is it’s not real , perhaps the ultimate 

example would be if one was hypothetically 

in space and observing horsehead 

it wouldn’t look remotely like the pillars 

of creation would it ?

Brian 

 

Edited March 28, 2021 by Solar B

[michael.h.f.wilkinson]

9 hours ago, Solar B said:

I reckon that working at these kind of F 

ratios the contrast will be good even with 

a Lunt but the whole question about 

imaging is it’s not real , perhaps the ultimate 

example would be if one was hypothetically 

in space and observing horsehead 

it wouldn’t look remotely like the pillars 

of creation would it ?

Brian 

 

I don't quite get your point. The initial question was about full-disk imaging without the need for mosaics. 

Focal ratio in imaging planets, moon, or sun is mainly of importance in selecting pixel size. The ASI178MM and ASI183MM, with their small pixels, work best at a focal ratio between F/10 and F/12, so the LS35 and LS40 would work optimally out of the box. The LS60 will allow full disk imaging with the ASI178MM (just), but you lose some detail (undersampling). You would need a Barlow to reach full resolution, but then you need a bigger chip for full disk.