Ha with 300mm Cassegrain in St Véran

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fjabet
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Ha with 300mm Cassegrain in St Véran

Post by fjabet »

Hello all, long time no see !
My new company has kept me very busy, and my new telescope was pretty late so all the solar stuff was on stand by.
Now I have received my new toy, it is a newton Cassegrain f/3.6-16 300mm from Skyvision with a zero dur primary.
It's very very good as expected from Michel Bonnin, and very smooth.

I wanted for a long time to test sub aperture ERF, one in front of the secondary taking most of the load, the other replacing the primary baffle to remove unwanted reflection of the main rejection.

I had a set of ERF coated for CaK and Ha, they are basically 80mm ERF made from fused silica.

That looks like this :

http://www.astrosurf.com/uploads/monthl ... e65a1.jpeg

http://www.astrosurf.com/uploads/monthl ... 832f7.jpeg

http://www.astrosurf.com/uploads/monthl ... 545b4.jpeg

http://www.astrosurf.com/uploads/monthl ... 817ff.jpeg

After testing in St Véran, it seems that the CaK version has an issue. Maybe a very small temp difference that just kills details like this, to be compared with Christian's images, Christian was standing 1,5m from me at that moment :

http://www.astrosurf.com/uploads/monthl ... 387ec5.png

But Ha do works. The coating is better for this one.
I used a PST etalon (the one Christian tested, the good one at less than 0,4A) Behind a 15mm blocker and a x2 power mate.
The Basler 1920 gave 0,12"/pixel, so remember that the features in the images below are pretty small !


http://www.astrosurf.com/uploads/monthl ... a39503.png

http://www.astrosurf.com/uploads/monthl ... 86232b.png

http://www.astrosurf.com/uploads/monthl ... 1d913d.png

http://www.astrosurf.com/uploads/monthl ... 0b6569.png

http://www.astrosurf.com/uploads/monthl ... 0fc996.png

http://www.astrosurf.com/uploads/monthl ... b35c0e.png

http://www.astrosurf.com/uploads/monthl ... c2f7c3.png

I quite happy with the results, and that could be extended to large apertures. 400mm seems pretty attainable.

Frédéric
Last edited by fjabet on Sat Aug 14, 2021 4:48 pm, edited 2 times in total.


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Re: Ha with 300mm Cassegrain in St Véran

Post by EGRAY_OBSERVATORY »

Not knowing what size all your images are Frédéric, it appears that unless they are JPEG's of 2-Mbytes (or less) they have not attached to your post.

Please try again as mentioned here by checking the format and sizes.

Thanks
Terry


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Re: Ha with 300mm Cassegrain in St Véran

Post by fjabet »

Thanks Terry !
Actually they are PNG, but hosted on Astrosurf. And it looks like the soft they use doesn't support links as images...


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Re: Ha with 300mm Cassegrain in St Véran

Post by fjabet »

Here are the images in jpg !
Attachments
IMG_4592.thumb.jpeg.d1e773e9683d013c92025da67af3211d.jpg
IMG_4592.thumb.jpeg.d1e773e9683d013c92025da67af3211d.jpg (882.84 KiB) Viewed 795 times
IMG_4591.thumb.jpeg.34c7c474ccf839ee3632f6217d9e2e78.jpg
IMG_4591.thumb.jpeg.34c7c474ccf839ee3632f6217d9e2e78.jpg (1.01 MiB) Viewed 795 times
IMG_4590.thumb.jpeg.14b2d969c7a43efd2cc1f6c2c77c774b.jpg
IMG_4590.thumb.jpeg.14b2d969c7a43efd2cc1f6c2c77c774b.jpg (1.06 MiB) Viewed 795 times
IMG_4589.thumb.jpeg.9a20536a75b8f7675af4a18e77cdd34b.jpg
IMG_4589.thumb.jpeg.9a20536a75b8f7675af4a18e77cdd34b.jpg (1.15 MiB) Viewed 795 times


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Re: Ha with 300mm Cassegrain in St Véran

Post by fjabet »

...
Attachments
Wprom__2021-08-14_T_09-22-41-0669_L_lapl3_ap2607.jpg
Wprom__2021-08-14_T_09-22-41-0669_L_lapl3_ap2607.jpg (386.5 KiB) Viewed 792 times
Wprom__2021-08-14_T_09-16-57-0039_L_lapl3_ap2548.jpg
Wprom__2021-08-14_T_09-16-57-0039_L_lapl3_ap2548.jpg (570.8 KiB) Viewed 792 times
W_run3__2021-08-14_T_09-30-29-0388_L_lapl3_ap6009.jpg
W_run3__2021-08-14_T_09-30-29-0388_L_lapl3_ap6009.jpg (1.15 MiB) Viewed 792 times
W_run3__2021-08-14_T_09-26-33-0661_L_lapl3_ap6038.jpg
W_run3__2021-08-14_T_09-26-33-0661_L_lapl3_ap6038.jpg (1.33 MiB) Viewed 792 times


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Re: Ha with 300mm Cassegrain in St Véran

Post by fjabet »

...
Attachments
Wrun1_2021-08-14_T_09-08-06-0303_L_lapl3_ap5873.jpg
Wrun1_2021-08-14_T_09-08-06-0303_L_lapl3_ap5873.jpg (1.15 MiB) Viewed 789 times
Wrun1__2021-08-14_T_09-02-26-0719_L_lapl3_ap5263.jpg
Wrun1__2021-08-14_T_09-02-26-0719_L_lapl3_ap5263.jpg (1015.23 KiB) Viewed 789 times
Panorama.jpg
Panorama.jpg (1.29 MiB) Viewed 789 times


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Re: Ha with 300mm Cassegrain in St Véran

Post by LeoD »

Congrats, Frédéric! Great setup in the right place.
Amasing results!
thanks for sharing
Leo


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Re: Ha with 300mm Cassegrain in St Véran

Post by EGRAY_OBSERVATORY »

Thanks Frédéric and they are all well-shown on here too.
The Astrosurf image of the scope certainly are crystal-sharp when zoomed-in on my screen.

Thanks and for the images.

Cheers
Terry


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Re: Ha with 300mm Cassegrain in St Véran

Post by Carbon60 »

Great images Frédéric. Superb setup and enviable setting, there, high up in the mountains.

Stu


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Re: Ha with 300mm Cassegrain in St Véran

Post by DeepSolar64 »

WoW, what an impressive scope! And it certainly delivers.


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Re: Ha with 300mm Cassegrain in St Véran

Post by Montana »

WOW!!!! I think I would die and go to heaven with a CaK image like that through my C11 :) not perfect but good enough for me :)

Terrific set of images and I only wish I was there at St Veran :hamster:
:bow :hamster:

Terry, Astrosurf won't pay for a security certificate to be https, so the links are not supported by this forum for linking. If you click on the written link and open in a separate tab it works fine. Thanks Frédéric for uploading the JPEGS :)

Alexandra


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Re: Ha with 300mm Cassegrain in St Véran

Post by MapleRidge »

Amazing series of images Frédéric...very well done :bow

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Re: Ha with 300mm Cassegrain in St Véran

Post by MAURITS »

Amazing Frédéric.


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Re: Ha with 300mm Cassegrain in St Véran

Post by ffellah »

Congratulations on the new scope, Frederic, and the excellent images. Looking forward to your progress improving your scope and more beautiful results.

Franco


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Re: Ha with 300mm Cassegrain in St Véran

Post by marktownley »

Good to see you here Fred and great images. I wonder if there is a bit of 'echo' of light between the 2 mirrored surfaces? were they tilted relative to each other?


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