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Transit of Mercury in the Spicule Layer. Phil took this great image with his Quantum 6 Scope, Solar Spectrum etalon and PGR Camera.

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C8 HA second shot : with PST etalon

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C8 HA second shot : with PST etalon

Post by fjabet » Tue Jan 28, 2014 5:00 pm

Hi all,

just before the clouds arrive, I tried the "HA C8" with another etalon : a PST FP without the lenses that are not needed here.
I used also a cheap webcan 0.5 reducer and that was a big mistake. I thought that in monochromatic light it would perform not too bad, but it does actually ; the resolution is very bad.
Nevertheless I'll soon have the final telecentric system that will deliver a nice F/D 27 instead of the actual F/D 40.

Anyway the goal was to validate the system with another etalon than the Daystar I used last time.

- PST etalon is fully covered without any soft spot
- As incredible as it sounds, the PST is more contrasted with the camera than the Daystar. Visually it's the opposite. I was ready to order a 0.5A quantum, I'll give a second thought.
- The BF15 forced me to reduce dramatically the AoI size of the large CMOSIS CMV4000 to 1000x1000, but it delivers 200 fps then.

I think a good compromise would be a larger 35mm FP from a Lunt LS50 with a Coronado BF30.







Frédéric.
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Re: C8 HA second shot : with PST etalon

Post by swisswalter » Tue Jan 28, 2014 5:08 pm

Hi Frédéric


wonderful shots. Tell us moore about the exact setup. I like to copy it ;-)
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Re: C8 HA second shot : with PST etalon

Post by Montana » Tue Jan 28, 2014 5:51 pm

:bow: :bow: :bow: fabulous resolution in the proms :)

Alexandra

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Re: C8 HA second shot : with PST etalon

Post by fjabet » Tue Jan 28, 2014 8:22 pm

Thanks Alex !

@Walter : the principle is quite straitforward : apply an ERF coating (dielectric coating) on the corrector plate, then add a dedicated telecentric system (in a cassegrain telescope field chief rays have a strong angle due to the secondary amplification), and that's it.
In the real life, the corrector processing is very expansive (over €4000 ex. VAT). That explain why I will through Airylab sell those telescopes as I will process several SCT at the same time to divide the cost.

I will announce that quite soon when everything is tested :)
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Re: C8 HA second shot : with PST etalon

Post by swisswalter » Tue Jan 28, 2014 9:58 pm

Hi Frédéric


thank you very much. Oh , that's costly. I have just spent a dozen pair of shoes for a coelostat. I better wait now before I get new stuff :whistle:

But please place me on the mailing list ;-)
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

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Re: C8 HA second shot : with PST etalon

Post by marktownley » Tue Jan 28, 2014 10:09 pm

Ok, this is pretty cool. I look forward to hearing a lot more about it :)
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Re: C8 HA second shot : with PST etalon

Post by Valery » Wed Jan 29, 2014 2:48 pm


- The BF15 forced me to reduce dramatically the AoI size of the large CMOSIS CMV4000 to 1000x1000, but it delivers 200 fps then.



What is the camera model do you use? Give us a link, please.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

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Re: C8 HA second shot : with PST etalon

Post by Suncityan » Wed Jan 29, 2014 3:14 pm



I will through Airylab sell those telescopes as I will process several SCT at the same time to divide the cost.

I will announce that quite soon when everything is tested :)

Does this mean you would be able to provide a kit sometime in the future to mod the old C8 stored away in my closet?

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Re: C8 HA second shot : with PST etalon

Post by fjabet » Wed Jan 29, 2014 4:38 pm

@Valery : http://en.ids-imaging.com/store/ui-3370 ... sv_gmbh_fr

We sell it in Europe, for US and RoW there are local dealers. We support it with our software Genika Astro.

@Suncityan : at this moment we do only C8 EdgeHD for alignment stability reasons (they are aplanetic, that means that even if the alignment changed slightly, the image quality is preserved). But in a second stage it is scheduled to offer this service to people who already have this instrument.
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Re: C8 HA second shot : with PST etalon

Post by Valery » Wed Jan 29, 2014 6:04 pm

@Valery : http://en.ids-imaging.com/store/ui-3370 ... sv_gmbh_fr

We sell it in Europe, for US and RoW there are local dealers. We support it with our software Genika Astro.

@Suncityan : at this moment we do only C8 EdgeHD for alignment stability reasons (they are aplanetic, that means that even if the alignment changed slightly, the image quality is preserved). But in a second stage it is scheduled to offer this service to people who already have this instrument.

Thanks. I see that PGR has cameras with the same chip, but faster 2x - 150fps at 10 bits. And a camera with 2x smaller height of the chip and 280fps. The latter is very interesting for recording of a very fast solar phenomena. For solar scopes as large as 11" or 14" this is a key factor - to have very good time resolution.


Valery.
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Re: C8 HA second shot : with PST etalon

Post by marktownley » Wed Jan 29, 2014 8:31 pm

Hi Frederic. Can you apply the ERF coating to large pieces of RG630?
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Re: C8 HA second shot : with PST etalon

Post by fjabet » Wed Jan 29, 2014 8:51 pm

@Valery : the CMOSIS CMV4000 can deliver up to 180fps full frame sensor wise. This is at 10 bits scaled down to 8. The 12 bit mode is only 37,5 fps (that's still 350 MB/s). Then the interface and the camera FPGA change the effective throughput. The PGR Gazelle, as well as the Basler ACE, are camera link and require a frame grabber. Actually the Basler supports the full throughput at 180 fps. The framegrabber represents an additional cost, and you must relie on specific acquisition software such as Streampix. Genika Astro nor Firecapture supports framegrabbers. We are in the process to integrate that in the Genika product line (Astro and Trigger), but rather for observatories and laboratories with Andor and Raptor photonics cameras.
The best compromise for the amateur is the USB3 interface that supports up to 90fps.
Note that the CMOSIS is a difficult companion and requires some learning curve :)

@Mark : Yes, and that would be a good choice for the dielectric coatin would be simplier as you don't have to cut the UV/B/G band. And no because Schott does not make bigger bars than 180x180mm. Another issue is to make a BK7 (for example) window at L/10 in transmission. Actually it's more expensive than to buy the C8 EdgeHD complete :)
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Re: C8 HA second shot : with PST etalon

Post by marktownley » Wed Jan 29, 2014 10:01 pm

Another issue is to make a BK7 (for example) window at L/10 in transmission.

How feasible is this for manufacture Frederic?
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Re: C8 HA second shot : with PST etalon

Post by fjabet » Thu Jan 30, 2014 4:06 pm

You mean grind it yourself or make it done ?
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Re: C8 HA second shot : with PST etalon

Post by marktownley » Thu Jan 30, 2014 6:52 pm

You guys make and sell a piece of BK7 @ 1/10 with an ERF coating...
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Re: C8 HA second shot : with PST etalon

Post by Valery » Fri Jan 31, 2014 2:14 am


The best compromise for the amateur is the USB3 interface that supports up to 90fps.
Note that the CMOSIS is a difficult companion and requires some learning curve :)



Frederic,

Most of us do not like compromises. The frame rate factor is one of the most important in solar photography. This is especially important (fastest possible frame rate) in telescopes with large apertures with high resolution. So, the time resolution and space resolution should be as high as possible. Not only for watching short time fast processes phenomena on the solar surface, but also for obtaining as many good frames as possible within a short time. For such large apertures as my further solar Ha scopes (280mm and 256mm) fastest possible f.r. is require for atmosphere freezing.
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Re: C8 HA second shot : with PST etalon

Post by swisswalter » Fri Jan 31, 2014 4:54 am

[quote]
The best compromise for the amateur is the USB3 interface that supports up to 90fps.
Note that the CMOSIS is a difficult companion and requires some learning curve :)



For such large apertures as my further solar Ha scopes (280mm and 256mm) fastest possible f.r. is require for atmosphere freezing.


Hi Valery

:woohoo: :woohoo: :woohoo: :woohoo: :woohoo: :mrgreen: :mrgreen: :mrgreen: :mrgreen:
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)

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Re: C8 HA second shot : with PST etalon

Post by fjabet » Fri Jan 31, 2014 7:34 am

@Mark : to get decent price on L/10 large size windows, you have to make a lot of them. Even Baader didn't go that way : everything above 180mm is on demand and the price magnitude changes :)

@Valery : well most of us have to cope with a budget. Budget aside, I'm also looking actually to get more speed than the CMOSIS in USB3. The only path is Camera Link that requires a desktop as Express card frame grabbers don't support the full link.

Actually I'm porting the support of the Andor Neo in Genika Astro/Trigger. That's quite a beast : http://www.andor.com/pdfs/specification ... ations.pdf
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Re: C8 HA second shot : with PST etalon

Post by marktownley » Fri Jan 31, 2014 6:30 pm

@Mark : to get decent price on L/10 large size windows, you have to make a lot of them. Even Baader didn't go that way : everything above 180mm is on demand and the price magnitude changes :)

Ahh, fair enough, that makes sense.
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