Celestron C8 F10 + PST CaK + SAFIX test
- Valery
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Celestron C8 F10 + PST CaK + SAFIX test
Hi all,
During last decade of June I have tested our ARIES 214mm and 265mm 3-bands D-ERF (with C8 and C11 scopes respectively) in
the Ca K line. For isolation of the Ca K line I have used PST Ca K filter. For compensation of a heavy spherical aberration at 393nm
the ARIES SAFIX device has been used. This is a variable spherical aberration corrector. UV grade.
I also imaged the sun with a 393nm Edmund pre-filter with 10nm bandwidth. The SAFIX has been used here too.
Here are images taken with my 203mm Celestron C8 telescope and PGR Flea3 ICX445 chip camera.
One can see that images are sharp enough for such an UV range and average seeing condition (4-6 out of 10). SAFIX does it work just fine in nullyfying of a heavy SA at 393nm.
Thanks for looking.
Valery
During last decade of June I have tested our ARIES 214mm and 265mm 3-bands D-ERF (with C8 and C11 scopes respectively) in
the Ca K line. For isolation of the Ca K line I have used PST Ca K filter. For compensation of a heavy spherical aberration at 393nm
the ARIES SAFIX device has been used. This is a variable spherical aberration corrector. UV grade.
I also imaged the sun with a 393nm Edmund pre-filter with 10nm bandwidth. The SAFIX has been used here too.
Here are images taken with my 203mm Celestron C8 telescope and PGR Flea3 ICX445 chip camera.
One can see that images are sharp enough for such an UV range and average seeing condition (4-6 out of 10). SAFIX does it work just fine in nullyfying of a heavy SA at 393nm.
Thanks for looking.
Valery
- Attachments
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- _June 21 2017 UT 06h 01m C8 F10 PST CaK ARIES 3-band DERF Flea3.png (1.35 MiB) Viewed 3125 times
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- _June 11 UT 08h 08m C8 f10 393nm 10nm Flea3.png (1.19 MiB) Viewed 3125 times
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- _June 11 UT 08h 03m C8 f10 393nm 10nm Flea3.png (906.09 KiB) Viewed 3125 times
Last edited by Valery on Tue Jul 11, 2017 3:42 am, edited 3 times in total.
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Re: Celestron C8 F10 + PST CaK + SAFIX test
This setup seems to work fine, indeed, images are very detailed. Is SAFIX a commercial device or is it produced on order ? How do you set the grade of correction required ?
Raf
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Re: Celestron C8 F10 + PST CaK + SAFIX test
Valery,
Could you take a similar series of images without the SAFIX for comparison purposes?
(The reason I ask is that we regularly image the spectrum down around the 3900A with a bandwidth of <0.05A and would like to know if your corrector could/ would improve the results)
Could you take a similar series of images without the SAFIX for comparison purposes?
(The reason I ask is that we regularly image the spectrum down around the 3900A with a bandwidth of <0.05A and would like to know if your corrector could/ would improve the results)
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- eroel
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Re: Celestron C8 F10 + PST CaK + SAFIX test
Valery:
Really nice clean and crisp work, I still have the SAFIX and have used it to correct the SA of some refractors and also SCT.
I would like to know where do you put the SAFIX in respect to the optical/filters and camera side.
I have not been able to keep testing the Aries D-ERF with my TEC 10" Mak, due to the raining season, at the rural observatory it rains a lot and I just go on weekends.
Hope that soon the raining season will start diminishing.
Best regards,
Eric.
Really nice clean and crisp work, I still have the SAFIX and have used it to correct the SA of some refractors and also SCT.
I would like to know where do you put the SAFIX in respect to the optical/filters and camera side.
I have not been able to keep testing the Aries D-ERF with my TEC 10" Mak, due to the raining season, at the rural observatory it rains a lot and I just go on weekends.
Hope that soon the raining season will start diminishing.
Best regards,
Eric.
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Re: Celestron C8 F10 + PST CaK + SAFIX test
That works well in that setup Valery!
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Re: Celestron C8 F10 + PST CaK + SAFIX test
SAFIX has been made in a very limited series - 50 samples.krakatoa1883 wrote: ↑Mon Jul 10, 2017 2:59 pm This setup seems to work fine, indeed, images are very detailed. Is SAFIX a commercial device or is it produced on order ? How do you set the grade of correction required ?
I have two samples and can part with one only.
Correction can be done easily looking at the screen. Rotate the barrel clock and counterclock wise and you see how sharp
the image is on the screen.
Valery
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Re: Celestron C8 F10 + PST CaK + SAFIX test
Super granulation Valery in the CaK, very nice indeed
Alexandra
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Re: Celestron C8 F10 + PST CaK + SAFIX test
Beautiful demonstration, Valery.
The granulation in the 393nm continuum is amazing. It must be much harder to image than the usual ~550nm.
I have a question about your Edmund Optics filter. My understanding was that these filters, generally, have significantly worse than lambda/4 (at 633nm) wavefront distortion. Your placement of the filter must minimize this problem. Where do you put it in your Optics train, near the camera?
Cheers.
Peter.
The granulation in the 393nm continuum is amazing. It must be much harder to image than the usual ~550nm.
I have a question about your Edmund Optics filter. My understanding was that these filters, generally, have significantly worse than lambda/4 (at 633nm) wavefront distortion. Your placement of the filter must minimize this problem. Where do you put it in your Optics train, near the camera?
Cheers.
Peter.
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Re: Celestron C8 F10 + PST CaK + SAFIX test
Peter,p_zetner wrote: ↑Tue Jul 11, 2017 4:33 pm Beautiful demonstration, Valery.
The granulation in the 393nm continuum is amazing. It must be much harder to image than the usual ~550nm.
I have a question about your Edmund Optics filter. My understanding was that these filters, generally, have significantly worse than lambda/4 (at 633nm) wavefront distortion. Your placement of the filter must minimize this problem. Where do you put it in your Optics train, near the camera?
Cheers.
Peter.
Imaging at 393nm is not MUCH harder. Just harder, sometime really harder, but not much. At least if your aperture is not 14" and if your telescope is well corrected at 393nm.
My Edmund filter specified to be at least 1/4 wave surface error = 1/8 wave in transmittance. It is about in 100mm prior to focus and works as residual pre-filter. It can be mounted also near the camera - if it's accuracy is not sufficient.
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Re: Celestron C8 F10 + PST CaK + SAFIX test
The 3-band D-ERF filter has been used. It transmits 393nm and 396nm for Ca II K and H, 430nm for G-band and 656nm for H-a.
You can buy it from me (I have only one UV grade sample for sale) or try to fishing it at the AstroMart.
Valery
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
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Re: Celestron C8 F10 + PST CaK + SAFIX test
Hello Eric,eroel wrote: ↑Mon Jul 10, 2017 4:03 pm Valery:
Really nice clean and crisp work, I still have the SAFIX and have used it to correct the SA of some refractors and also SCT.
I would like to know where do you put the SAFIX in respect to the optical/filters and camera side.
I have not been able to keep testing the Aries D-ERF with my TEC 10" Mak, due to the raining season, at the rural observatory it rains a lot and I just go on weekends.
Hope that soon the raining season will start diminishing.
Best regards,
Eric.
You don't need the SAFIX if you will image the Sun at CaK/H with your 10" Mak. SAFIX is required for using in SCT and fast refractors.
Valery
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Re: Celestron C8 F10 + PST CaK + SAFIX test
Valery:
Thanks for the information, I was thinking on my 102mm f/9 Meade refractor where I have my PST CaK mod unit.
I have used the SAFIX unit with this refractor to image the moon and it did really helped getting a better image.
Best regards,
Eric.
Thanks for the information, I was thinking on my 102mm f/9 Meade refractor where I have my PST CaK mod unit.
I have used the SAFIX unit with this refractor to image the moon and it did really helped getting a better image.
Best regards,
Eric.
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Re: Celestron C8 F10 + PST CaK + SAFIX test
I believe that SAFIX will not help because of it's limited FOV. This device is for a high resolution work.Merlin66 wrote: ↑Mon Jul 10, 2017 3:29 pm Valery,
Could you take a similar series of images without the SAFIX for comparison purposes?
(The reason I ask is that we regularly image the spectrum down around the 3900A with a bandwidth of <0.05A and would like to know if your corrector could/ would improve the results)
May be a specially designed and custom made corrective optics will be a better option?
However, tell me what is the feeding objective in your system.
BTW. Is this possible to image at 8542,1A wave length? I saw a few professional shots at this wave length and they are the mot impressive sun images taken from the earth ground. Spectacular mixture of Ca II and H-a - like structures of middle and upper chromosphere. And that images were taken with large spectrogeliograph with about 0,1A bandwidth.
Valery.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
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Re: Celestron C8 F10 + PST CaK + SAFIX test
If the seeing (early morning at summer time and during first part of the day at winter) will be OK, you will easy
image the sun at Ca II K with your 10" Mak and small 4" refractor can't compete vs 10" monster.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.