First starlight for my new echelle

Design, construction, tuning of spectroscopes
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Joan Guarro Flo
Posts: 611
Joined: Thu Nov 03, 2011 8:50 pm

Re: First starlight for my new echelle

Post by Joan Guarro Flo »

Hi James,

I think that here there are some concepts to clarificate,

In this case the Canon 135mm, F/2, with its 10 optical elements doesn't use its full diameter and depending on the prism to objective distance in the best case this F/2 really works at F/2.6. However, in the NOU_T echelle the mentioned distance is really shortest and an entrance pupil of the Nikon 135mm. F/2.8, ( 5 optical elements ), as sufficient enough. Although this last one has an insufficient exit pupil, so I believe one older Nikon AI 135mm. F/2, ( 6 optical elements ), would work better.

But on the other hand, till some few days I'll explain some evident reasons because I'm going to come back to the Nikon 85mm. F1.8, I only can say now that if you count (135*135)/(85*85) you can note that one135mm. needs 2.52 times exposure than a 85mm. one to reach the same theoretical results.

In these three last graphics you can see that the Nikon has a "good UV penetration" too.

If you review Tim Lester's project you can realise that the NOU_T doesn't use optical fiber.

Cheers, Joan.
James Foster
Posts: 439
Joined: Sun Jan 24, 2016 7:14 am

Re: First starlight for my new echelle

Post by James Foster »

To: Joan,

Thanks for the careful explanation.

RE"....you can note that one135mm. needs 2.52 times exposure than a 85mm. one to reach the same theoretical results...."

Maybe this is why I show less light on orders below 55 than your custom made spectrograph. Yet in Christian's report, he was able to get good data on his eShel2 (above s/n 10) on 13th magnitude stars with a 1200sec exposure.....but as I noted on the other thread, his injection unit is made for his F/4 - F/5 speed Newtonian while mine is F/7, for a F/6.8 optical CDK17.....their is a lot of "black magic" involved in optimizing these instruments!

James
James Foster
eShel2-Zwo ASI6200MM Pro
Lhires III (2400/1800/600 ln/mm Grat) Spectroscope
LISA IR/Visual Spectroscope (IR Configured)
Alpy 200/600 with Guide/Calibration modules and Photometric slit
Star Analyzer 200
Joan Guarro Flo
Posts: 611
Joined: Thu Nov 03, 2011 8:50 pm

Re: First starlight for my new echelle

Post by Joan Guarro Flo »

Hi James,

Christian shows to us in his true master study the  EM* MWC 622 graphics and he's thrusted in the ArasBeam Be Data, because in it said this star is a 12 V mag. star but  I think that is unfortunately wrong. If you find it in SIMBAD you can see 10.656501 G mag., in Vizier 10.73 Pmag., more specific is the GAIA Catalogue done for this star GSC DR2 2028868200509932800 to 10.98 V mag., it is 2.52 times more brilliant than de 12Vmag. !!

I don't know anything about 13 V mag. observations.

Despite this, Christian observation was very nice, but you can see, in this world miracles rarely happen, in my Catalan Language we say that there was a person who performed miracles but someone killed him. 

Regards, Joan.
Joan Guarro Flo
Posts: 611
Joined: Thu Nov 03, 2011 8:50 pm

Re: First starlight for my new echelle

Post by Joan Guarro Flo »

Hello,

You can see here some CQ Dra graphics that I observed last night, the NOU_T echelle with a NIKON 85mm. F/1.8 objective gives more agility to the observations  and its R = 9000 is very useful for analytical measurements with really any difference as the NIKON 135mm.  R = 11000 and with the same precision.

I hope that it likes you, you know, you can reach to have a NOU_T too.

J. Guarro
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CQ Dra3.png
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CQ Dra4.png
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Joan Guarro Flo
Posts: 611
Joined: Thu Nov 03, 2011 8:50 pm

Re: First starlight for my new echelle

Post by Joan Guarro Flo »

Hello at all,
It seems that after NOU_T echelle was born and passed tests, checks and improvements it has arrived to adult age, and I can say that its observational results there are contributing in three in course professional studies, - so I can mention it -, in two cases, the NOU_T echelle spectra have chose between a lot of another observations in a  database and in the third case due a direct collaboration.

I've noted these professional teams, examined oscillations in the spectra NOU_T graphics from 3800 to 8900 Angstroms, so I am afraid thatother very good high resolution graphics that don't reach this range could be incomplete in some cases. Low resolution is useful for achieving a good stellar flux only. That opinion is applicable on these three studies that I know.  Ernst Pollmann answered my question very quickly by asking about specific low resolution observations.

With two options, low and high resolution, if we want to,  we can choose between if we want to make testimonial observations for showing, or if we want to make useful observations for analysis studies.  That is the personal feel of everyone.

On the other hand, I've come back at R = 9000, with the Nikon 85mm. F/1.8 objective, first because two different analytes told me that they haven't seen any remarkable difference between R=11000 and R=9000, because in both cases the error measurements were the same, so 1%.

In my equipement there are significant advantages with R=9000, time exposure is half reduced, more weak magnitude detected, files more lighter, etc., you know, one equipement works as well as the worst of their elements.

I want to remain you, for last time, that went you want to I could help you achieve a NOU_T echelle. I hope that you could see my future observation graphics and my offer will continue to exist,

Cheers, J.Guarro.  
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THE LEO.png
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Joan Guarro Flo
Posts: 611
Joined: Thu Nov 03, 2011 8:50 pm

Re: First starlight for my new echelle

Post by Joan Guarro Flo »

Hello,

I would say to you that making a NOU_T echelle is really easy - but a bit laborious -, and with ISIS software its operation and reducing data are surprisingly fast and easy too.

The myth that making an echelle is something difficult and out of reach of any observer isn't true, it's false.

BTW, you can see here the NOU_T optical elements and websites.

Cheers, J. Guarro.



GUIDE BOX

# 1 .- FOCAL REDUCER OR NEGATIVE BARLOW LENS

FOCAL REDUCER FOR SCHMIDT CASSEGRAIN TELESCOPES

Alan Gee Telecompresor MarkII.

https://www.baader-planetarium.com/en/a ... t-20).html



FOCAL REDUCER FOR MEADE SC – ACF

Edmund Optics , 40mm Dia. x 250mm FL, MgF2 Coated, Achromatic Doublet Lens #32-935

https://www.edmundoptics.com/p/40mm-dia ... lens/2704/



NEGATIVE BARLOW LENS ( it depends on the focal ratio of each telescope )

https://farpointastro.com/shop/apm-2-in ... rlow-lens/

L-AON012 D 31.50 F-100.00 BF-103.80 7.8 10.70

http://catalog.rossoptical.com/catalog/ ... achromats/

https://www.edmundoptics.com.sg/p/40.4m ... ens/25567/

----------

# 2 .- One Pinhole. 50 microns ( unblackened ), mounted in M25 mm. Standar Round Apertures. http://www.nationalaperture.com/pinhole.htm

----------

# 3 .- One Flat mirror for a guide. , Reference # 89-477 https://www.edmundoptics.eu/p/15-x-21mm ... ror/31982/


------------

# 4 .- Two Achromatic doublets 12.7 mm diameter and 75 mm. focal.

https://www.thorlabs.com/thorproduct.cf ... C127-075-A

---------------

# 5 .- One Flat mirror for tungsten light, 15x21x3. Reference # 89-477 https://www.edmundoptics.eu/p/15-x-21mm ... ror/31982/



==========================================================================

MAIN BOX

# 6 .- One Concave Mirror, UV Enhanced Aluminium, Diameter 25.4 mm. f = 100 mm. ( see the reflection graphic ),very good transmission in 3700 Angs. and between 8000 at 9000. https://www.thorlabs.com/thorproduct.cf ... 54-100-F01

------------------

# 7 .- One Flat mirror, UV Enhanced Aluminium square 25.4 x 25.4 x 6.0 mm., we need to make a hole in it afterwards.

https://www.thorlabs.com/thorproduct.cf ... Q10-03-F01

-----------------------

# 8 .- One Richardson Echelle grating 25x50x6 mm. 79 l/mm. Blaze 63º

https://www.edmundoptics.eu/p/79-groove ... ing/43670/

-------------------------

# 9 .- One Equilateral prism F2 size = 40x40x40 mm. Without AR coating Ref. 04 JE 40

comaroptics.com/components/plano-optics/prisms/inverting-and-dispersing-prisms

Or Equilateral prism F2 size = 40x40x40 mm. AR coated vis Ref.PEG4040

https://www.knightoptical.com/stock/def ... rture.html

================================================================================

FOTOGRAPHIC OBJECTIVE AND MAIN CAMERA

# 10 .- Fotografic Objective Nikon Nikkor 85mm. F1.8 AF. Metal version.

https://www.ebay.fr/sch/i.html?_sacat=0 ... .8d&_frs=1



# 11 .- ASI2600MM, recommended, but it works with an ATIK460EX too.

https://www.telescopiomania.com/camaras ... cromo.html



LAMPS AND BULBS.

# 12.- Calibration light, RELCO SC 480 S53993 80W 225V

https://www.krealo.es/a/arrancador-cebador-sc480-s53993

----------------------------

# 13 .- Tungsten Lamp. Lamp SOLUX 35004 MR16 12V 35W 4700K 24º ( or 36º)

https://www.prozic.com/www2/info_promo_ ... solux.html

------------------------

# 14 .- LED diameter 4 mm. Approx. pinhole's retroillumination, 5V DC prevision.
Joan Guarro Flo
Posts: 611
Joined: Thu Nov 03, 2011 8:50 pm

Re: First starlight for my new echelle

Post by Joan Guarro Flo »

Hello,

You can see here a sample of the reliability levels of the NOU_T echelle observations.

You can extract your own opinion about that, which is signal and which is aleatory noise.

Cheer, J.Guarro.
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Joan Guarro Flo
Posts: 611
Joined: Thu Nov 03, 2011 8:50 pm

Re: First starlight for my new echelle

Post by Joan Guarro Flo »

Hello,

You know the camera is an essential part of your spectrograph.

Three weeks ago I noticed that stated to appear weird and incomprehensible lines in the stellar graphics that I observed from the remote SMM observatory, I found that their origin was a rare liquid leak over the chip of the ASI2600MM camera, - you can see the picture -, last week I sent the camera to my seller, and he sent it to European ZWO, in Germany.
Quickly the European ZWO has sent to me a new ASI2600MM, that I hope recibe next few days.

From this I have deduced that I not only have a good camera but that there is also a really reliable and professional company behind it.

To ASI camera owners, for our peace of mind, I leave this ZWO website link,
https://astronomy-imaging-camera.com/ne ... meras.html

Cheers, J.Guarro.
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ASI2600MM.png
ASI2600MM.png (1.23 MiB) Viewed 7688 times
Joan Guarro Flo
Posts: 611
Joined: Thu Nov 03, 2011 8:50 pm

Re: First starlight for my new echelle

Post by Joan Guarro Flo »

Hello,

At any cost, the new ASI2600MM was from ZWO Europe, and after its setup, now I demostrate here the first test through Vega star, it seems that all works well again in the Remot SMM Observatory.

Regards, J.Guarro.
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ASI NOVA.png
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VEGA1.png
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VEGA2.png
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Joan Guarro Flo
Posts: 611
Joined: Thu Nov 03, 2011 8:50 pm

Re: First starlight for my new echelle

Post by Joan Guarro Flo »

Hello,

You can notice in this picture the evolution and improvement of Piera and SMM observatories from the year 2017 to now. They have passed from taking very noisy and short graphics in the past, to notable, finest and more extended ones nowadays.

Cheers, Joan Guarro.
Attachments
_TX CVN comparison.png
_TX CVN comparison.png (48.68 KiB) Viewed 7149 times
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