Today's SUN (20180407) | SM90II first light

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pedro
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Today's SUN (20180407) | SM90II first light

Post by pedro » Sat Apr 07, 2018 1:58 pm

Today's SUN (20180407) | SM90II first light

WEBLINK:
http://re.apaaweb.com/sun_h_alpha_2018-04.html

Finally a few images with the LUNT152 + CORONADO SM90II

It seems that this etalon works better with high focal ratios (F/10)

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IMAGING SETUPS

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IMAGING SETUPS

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SUN (20180407). H-alpha DISK & PROMS (09:30 UTC). LUNT152, SM90II, BF30, PGR GRASSHOPPER 3 GS3-U3-28S5M, two-pane mosaic

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SUN (20180407). H-alpha DISK & PROMS (09:30 UTC). LUNT152, SM90II, BF30, PGR GRASSHOPPER 3 GS3-U3-28S5M, two-pane mosaics

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SUN (20180407) H-alpha DISK & PROMS (08:30 UTC). LUNT60, BF30, PGR GRASSHOPPER 3 GS3-U3-28S4M

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SUN (20180407) H-alpha DISK & PROMS (08:30 UTC). TV101 F/5.4, SM60, BF30, PGR GRASSHOPPER 3 GS3-U3-28S4M

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SUN (20180407) H-alpha DISK & PROMS (08:30 UTC). TV101 F/5.4, SM60, BF30, PGR GRASSHOPPER 3 GS3-U3-28S4M

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SUN (20180407) CaK PROMS (08:30 UTC). TV101 F/5.4, LUNT 1200 CaK Module, PGR GRASSHOPPER 3 GS3-U3-28S4M

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SUN (20180407) WL, CaK & H-alpha (08:30 UTC). TV101 F/5.4, LUNT 1200 CaK Module, SM60, BF30, PGR GRASSHOPPER 3 GS3-U3-28S4M

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Valery
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Re: Today's SUN (20180407) | SM90II first light

Post by Valery » Sat Apr 07, 2018 4:07 pm

pedro wrote:
Sat Apr 07, 2018 1:58 pm


Finally a few images with the LUNT152 + CORONADO SM90II

It seems that this etalon works better with high focal ratios (F/10)
Hi Pedro,

A front mounted etalon works equally with different F/D of a scope. If you see the improvement - this is because the blocking filter works better in a slower F/D cone - it's bandwidth can widens with fast F/ratios and narrows with slower F/D - as the result you see the system overal performance. Several years ago I read this from Andy Lunt and I also noticed this with my first etalon 90mm Codonado Isle of Man. So, may be it is worth to try a weak barlow lens in a front of BF30 filter making equal F/D slower - about F/15-20.

This etalon is not that narrow (or may be not perfectly in band) but delivers a very uniform picture. I believe that with the Lunt 152 equipped also with it's native etalon, this SM90II will give outstanding DS pictures.

Valery
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pedro
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Re: Today's SUN (20180407) | SM90II first light

Post by pedro » Sat Apr 07, 2018 4:13 pm

Thanks Vallery

My old Pre-Meade SM90 (that I sold unfortunately) worked fine with my TV101 F/5.4

With the SM90II it seems that I only have good images (on band) with longer focal ratios. I will try the barlow as soon as I have something to image (AR or prom)

I also plan to use it as a double stack etalon (LUNT152 Ha + SM90II)

regards

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Re: Today's SUN (20180407) | SM90II first light

Post by Montana » Sat Apr 07, 2018 6:31 pm

Very quiet, but the filament is still a nice target :bow :hamster:
Alexandra



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Re: Today's SUN (20180407) | SM90II first light

Post by eroel » Sat Apr 07, 2018 11:18 pm

Pedro:
Nice session and presentation as always.
Abrazo,
Eric.

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Re: Today's SUN (20180407) | SM90II first light

Post by yltansg » Sat Apr 07, 2018 11:48 pm

Hi Pedro,

Nice triband collection.

Alfred

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Re: Today's SUN (20180407) | SM90II first light

Post by Ronnie_Clayton » Sun Apr 08, 2018 12:44 am

Great pics Pedro, congratulations!!
Your collection of solar equipment is a dream :o .
Ronnie

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Re: Today's SUN (20180407) | SM90II first light

Post by MapleRidge » Sun Apr 08, 2018 1:27 am

Great images from this session Pedro :bow

Brian
Brian Colville

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Cambray, ON Canada

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Re: Today's SUN (20180407) | SM90II first light

Post by Carbon60 » Sun Apr 08, 2018 9:09 am

Nice set of images, Pedro. Great first light.

Stu.
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Re: Today's SUN (20180407) | SM90II first light

Post by Derek Klepp » Sun Apr 08, 2018 9:50 am

Definitely a different look Pedro I do look forward to the double stacking edition.


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Re: Today's SUN (20180407) | SM90II first light

Post by marktownley » Sun Apr 08, 2018 12:39 pm

Very good Pedro! That 90mm DS setup should allow you some close up views of any more features we get.
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Re: Today's SUN (20180407) | SM90II first light

Post by pedro » Sun Apr 08, 2018 1:07 pm

Thanks Mark. I will try the DS next time. Unfortunately there are not many features to image


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