Mod TS 152/900 Individual

Frankenscope? Let's see it!***be advised that NOTHING in this forum has been safety tested and you are reading and using these posts at your own peril. blah, blah, blah... dont mess around with your eyesight when it comes to solar astronomy. Use appropriate filtration at all times...
Galosimo
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Re: Mod TS 152/900 Individual

Post by Galosimo » Tue Aug 08, 2017 5:30 pm

I removed all the lenses from the etalon. You need the telecentric x this system I designed.

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Re: Mod TS 152/900 Individual

Post by bart1805 » Tue Aug 08, 2017 6:03 pm

Thanks, but I don't understand it completely. Normally you would say that you need to put the first etalon minus 20 cm of the focal point of a F10 scope.
But if you change the front lense of the etalon with another concave lens you can get away with something else.

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Re: Mod TS 152/900 Individual

Post by Galosimo » Tue Aug 08, 2017 6:08 pm

Then I repeat I do not use any lens. The original lenses have been removed and 4. in their place use a 5x telecentric made specifically for my focus.

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Re: Mod TS 152/900 Individual

Post by Galosimo » Tue Aug 08, 2017 6:09 pm

You could change the lens but still the result would not be good because the beam would not reach the correct inclination of the original collimated beam.

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Re: Mod TS 152/900 Individual

Post by bart1805 » Tue Aug 08, 2017 6:13 pm

That is cool! I allways thought it was necessary, but apparently it is not.
I am sorry, one other question. Can you just use the scope now as a F30?

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Re: Mod TS 152/900 Individual

Post by Galosimo » Tue Aug 08, 2017 6:18 pm

Yes

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Re: Mod TS 152/900 Individual

Post by bart1805 » Tue Aug 08, 2017 6:24 pm

Thanks!

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Re: Mod TS 152/900 Individual

Post by Merlin66 » Tue Aug 08, 2017 6:36 pm

Bart,
The majic 200mm was based on the standard front barlow lens giving a parallel collimated beam to the etalon, and the rear lens re-imaging to the focus.
If both lenses are removed, then you have a degree of freedom....for optimum performance the etalon needs to be in a beam >f25, close to f30 is good.
This can be achieved with a telecentric barlow ie the x4 with an f7.5 scope and then select the re-focusing lens to suit your requirements....
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Re: Mod TS 152/900 Individual

Post by bart1805 » Tue Aug 08, 2017 6:48 pm

Aha. So I am mixing things up... So instead of a collimated beam through the etalon you aim at f25 - f30. But then you have to remove both lenses. Like that?

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Re: Mod TS 152/900 Individual

Post by Merlin66 » Tue Aug 08, 2017 7:31 pm

Yeah, a perfectly parallel and collimated would be ideal, but around f30 works well. The rear lens could be retained to bring the final focus 200mm behind the etalon, or replaced with one to suit your system.
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Re: Mod TS 152/900 Individual

Post by bart1805 » Tue Aug 08, 2017 7:36 pm

Thanks Merlin. Now I also understand why all the sct owners are talking about f30...... steep learning curve. (-;

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Re: Mod TS 152/900 Individual

Post by bart1805 » Fri Aug 11, 2017 8:49 am

Hi Galosimo and Merlin,
Could one of you tell me why it is useful to place the blocking filter before the etalons?
Thanks, Bart.

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Re: Mod TS 152/900 Individual

Post by Galosimo » Fri Aug 11, 2017 9:15 am

My is before the telecentric so I collect the beam before, when it is smaller and i just need a BF15

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Re: Mod TS 152/900 Individual

Post by Merlin66 » Fri Aug 11, 2017 9:54 am

Bart,
The ERF is generally mounted in front of the etalon.
The blocking filter is mounted behind the etalon. I've never seen an application were the blocking filter was mounted before the etalon......
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Re: Mod TS 152/900 Individual

Post by Galosimo » Fri Aug 11, 2017 10:00 am

The important thing is that it works. Experiments serve this.

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Re: Mod TS 152/900 Individual

Post by bart1805 » Fri Aug 11, 2017 10:11 am

That is what I thought Merlin. But Galosimo has put it before the telecentric and it works. If I look at the Beloptik site he seems to do the same: http://beloptik.de/de/left/h-alpha-system-2/

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Re: Mod TS 152/900 Individual

Post by marktownley » Fri Aug 11, 2017 10:30 am

Blocker is infront of the telecentric in my Daystar setup...
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Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: Mod TS 152/900 Individual

Post by Merlin66 » Fri Aug 11, 2017 12:10 pm

Hmmmm
OK.
IF the blocking filter is larger than the etalon, then I see it could be mounted in front of the etalon.
All the blocking filters I have experience with have always been smaller than the etalon.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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Re: Mod TS 152/900 Individual

Post by Merlin66 » Fri Aug 11, 2017 2:58 pm

My experience with PST and the "standard" mods is beginning to show my limitations.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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Re: Mod TS 152/900 Individual

Post by Solar B » Fri Aug 11, 2017 7:50 pm

Yeah the Quarks have their BF in front ... Totally Weird imho !! but obviously works well and reflects most of the IR.

Is this not the PST Mod Holy Grail ... the DS Mod ... Respect if ever it was due.

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Re: Mod TS 152/900 Individual

Post by Galosimo » Fri Aug 11, 2017 10:04 pm

My bf is smaller than the etalon BF = 15mm, etalon 20mm. The doublestuck as I set up with telecentrica works fine.

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