SolarMax II 60 imaging difficulties

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DeepSolar64
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SolarMax II 60 imaging difficulties

Post by DeepSolar64 »

All,
I don't know how many have noticed but I with the exception of only once I have never used my Coronado SolarMax II 60 telescope for imaging and it's not because I haven't tried. While my SMII90 does well for this purpose showing both disc and prominence detail well and evenly my 60 just well....doesn't. It does ok visually. I can see mottles, filaments, plages and prominences ok but when it comes to imaging them all I get is a blank disk. The proms also have to be really bright to even show up on the images. I have long suspected the scope may have issues since even visually it's confined to very low powers ( 16x-21.5x to 33x-50x if the object viewed is really bright. I see people here with PSTs and Lunt 50s that exceed this easily. Also I don't see much of a difference when I tune the internal etalon. I have even tried removing the peg to change it's position to try to improve it. The front DS etalon makes much more of a difference when I tune it. Anyway, to put it short, why can I see detail in the scope visually but fail to see it on the computer monitor or image it? The scope seems " visual only ".

The Coronado SMII60 would be nice to use for imaging if I can get it to work. It could do full discs without doing mosaics. The SMII90 cannot.

James
Last edited by DeepSolar64 on Thu Apr 15, 2021 5:12 am, edited 1 time in total.


Lunt 8x32 SUNoculars
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
ZWO ASI178MM monochrome camera
Lunt, Coronado, TeleVue, Orion and Meade eyepieces

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Re: SolarMax II 60 imaging difficulties

Post by EGRAY_OBSERVATORY »

Hi James, if when you say "all I get is a blank disk.", suggests to me that the download program may require different settings, such as a smaller exposure-setting in "ms"...

If you have already tried different settings in whichever program you are using, then presumably if you are using the same camera as in the SMII90,
there may be an issue with the scope/Etalon, which I doubt as the EP says all OK with that scope.

Certainly with a smaller objective in the 60, exposure-settings will be a little different from the 90.

Please take an image as you have seen and post it on here, for others of us to see and suggest - as well ???

Regards
Terry


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Re: SolarMax II 60 imaging difficulties

Post by Merlin66 »

James,
I’d suggest removing the DS and backing off the tuning of the internal etalon.
Softly softly Re-tune the SM60II to get the best results. Using the pressure tuning moves the bandwidth towards the red wing, so adjust carefully.
When it gives good images add the DS and tilt it to give a good histogram.


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Re: SolarMax II 60 imaging difficulties

Post by Montana »

Give what Merlin says a try and take photos, show us the various stages as you tune so we see a sequence of images through tuning. It will help us get a better idea what is going on.

Alexandra


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Re: SolarMax II 60 imaging difficulties

Post by DeepSolar64 »

I'll post images from the SMII60 scope the next time I image using it. I'll see what I can do. Don't expect much....

Thanks for the advise everyone. It's got me stumped.


Lunt 8x32 SUNoculars
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
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Re: SolarMax II 60 imaging difficulties

Post by marktownley »

Have you tried the blocking filter from your 90 in the 60 and see if it makes any difference?


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Re: SolarMax II 60 imaging difficulties

Post by DeepSolar64 »

No, but that's a great idea! I can't see anything wrong with the filter by just looking at it but switching them would tell me for sure if it's a rusty filter or not.

James


Lunt 8x32 SUNoculars
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
ZWO ASI178MM monochrome camera
Lunt, Coronado, TeleVue, Orion and Meade eyepieces

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Re: SolarMax II 60 imaging difficulties

Post by DeepSolar64 »

Though I did not image today I did try both blocking filters on the SMII60 visually. The one used on the SMII60 kept right up with the one I use on the SMII90. Looking at them I see no visible signs of rust. Both are BF15 filters.


Lunt 8x32 SUNoculars
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
ZWO ASI178MM monochrome camera
Lunt, Coronado, TeleVue, Orion and Meade eyepieces

Image Visual Observer
" Way more fun to see it! "
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