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Single and double stack disks from 3-26-2023

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#1 hopskipson

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Posted 27 March 2023 - 08:08 PM

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.

 

2023-03-26-1741_5-U-L-Sun23561760imppgPS.jpg

 

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.

 

2023-03-26-1746_9-U-L-Sun43961768imppgPS.jpg

 

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.

 

2023-03-26-1825_7-U-L-Sun21161672imppgPS.jpg

 

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


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#2 Zhengyi

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Posted 27 March 2023 - 09:48 PM

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?
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#3 dhkaiser

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Posted 28 March 2023 - 06:15 AM

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


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#4 hopskipson

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Posted 28 March 2023 - 07:29 AM

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.
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#5 hopskipson

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Posted 28 March 2023 - 07:30 AM

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.
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#6 dhkaiser

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Posted 28 March 2023 - 09:11 AM

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.


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