5 replies to this topic

[hopskipson]

It's been a while since I was able to get some decent time and weather at the same time to image the sun.

 

The first is a single stack image with a Lunt LS80 and ASI174MM.  Seeing was pretty good.

 

 

This second is the LS80 double-stacked with an original Isle of Man Coronado 90 mm etalon.  I'm still working on getting the tilt just right.

 

 

The last is double-stacked with the Lunt internal double-stack unit. I think I got this pretty dialed in. Try to ignore the white framing as I tried to get the orientation right.

 

 

I was going to try for the triple-stack but the sun was lost behind some branches. Thanks for looking!

[Zhengyi]

I like the second image the best. It really shows that double-stacking with the front mounted etalon is far more superior, offering better contrast than the internal double-stack unit.

Just curious, what blocking filter are you using with the LS80 double-stacked with an original Isle of Man Coronado 90 mm etalon configuration? I'm guessing the Coronado?

[dhkaiser]

Nice comparison, however your Lunt Lunt DS is off band.  Compare SW area in band and SE off band.

[hopskipson]

Nice comparison, however your Lunt Lunt DS is off band. Compare SW area in band and SE off band.

I have such a hard time aligning the sweet spots of both etalons. At least my CP filter is working well. No glow around the limb.

[hopskipson]

I like the second image the best. It really shows that double-stacking with the front mounted etalon is far more superior, offering better contrast than the internal double-stack unit.

Just curious, what blocking filter are you using with the LS80 double-stacked with an original Isle of Man Coronado 90 mm etalon configuration? I'm guessing the Coronado?

I’m actually using a Lunt 1800 that is modified for double stacking.

[dhkaiser]

I have such a hard time aligning the sweet spots of both etalons. At least my CP filter is working well. No glow around the limb.

I too have that trouble.  It is difficult.