Lunt Pressure Tuner + Quark Question

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MapleRidge
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Lunt Pressure Tuner + Quark Question

Post by MapleRidge »

Good day everyone...

A question for those of you who are double stacking a Quark with a Pressure Tuned Lunt scope, regarding how much the double stack increases the exposure required to get a decent image.

I have tried to DS my Quark Combo behind the Lunt DSII on the modded scope and no matter what amount of amplification I use ahead of the Quark the exposures are terribly long...into the multiple 1/10s of a second exposure. As you can imagine, the results are terrible with the long exposures and long exposure interval from start to finish.

The typical results of the CR-150/DSII with the 3x or 2.7x amplification are in my usual posts. If I remove the B1800 and replace it with the Quark Combo (chromosphere), in the imaging train after the DSII etalon the result as described above is what I have.

Any thoughts or suggestions? Maybe I'm configuring the pieces int eh wrong order, but can't really see how else to assemble it all.

Any help will be much appreciated.

Brian


Brian Colville

Maple Ridge Observatory
Cambray, ON Canada

Photos: https://www.flickr.com/photos/185395281@N08/albums

10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM

2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
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Re: Lunt Pressure Tuner + Quark Question

Post by marktownley »

Do you use the anti reflection filter on the Lunt module Brian? If so, this is polarised, and, the output from the Quark is polarised which would explain such a loss of light.

Mark


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Re: Lunt Pressure Tuner + Quark Question

Post by krakatoa1883 »

Agere with Mark, there should be something in the train that makes image considerably dimmer.

With front DERF ---> Lunt PT ---> Quark BF ---> Quark etalon I don't have any issue... however my Lunt part is SS, not DS.


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Re: Lunt Pressure Tuner + Quark Question

Post by MapleRidge »

Raf...

Thanks for confirming your lineup of equipment in the imaging train, I think mine is essentially the same. The Lunt etalon is the double stack module but only acts like a single stack in the mod. You have posted pics of the mod you have...have you got one with the Quark installed?

Thanks,
Brian


Brian Colville

Maple Ridge Observatory
Cambray, ON Canada

Photos: https://www.flickr.com/photos/185395281@N08/albums

10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM

2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
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Re: Lunt Pressure Tuner + Quark Question

Post by krakatoa1883 »

Here is a picture of my set up and a couple of images. Usually I reserve the stacking to good seeing conditions as it's not always easy to find the best matching between PT and Quark tunings, for example my Quark tunes better in summer, Lunt PT in winter :D (don't ask me why) but when both tunings match images are really beautiful.
LuntQuark.jpg
LuntQuark.jpg (106.99 KiB) Viewed 2310 times
LuntQuark1.jpg
LuntQuark1.jpg (96.95 KiB) Viewed 2310 times
LuntQuark2.jpg
LuntQuark2.jpg (101.23 KiB) Viewed 2310 times
chromo luntmod 20180905.jpg
chromo luntmod 20180905.jpg (471.39 KiB) Viewed 2308 times


Raf
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Re: Lunt Pressure Tuner + Quark Question

Post by rsfoto »

Hi Raf,

Very very good images.


regards Rainer

Observatorio Real de 14
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