Baader / Solar Spectrum Telecompressor 0.7x

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Baader / Solar Spectrum Telecompressor 0.7x

Post by marktownley » Wed Feb 18, 2015 5:44 pm

Hi There folks.

I was wondering if anyone has a little more information about this product? This is what i've found - http://www.baader-planetarium.de/sektion/s37/s37.htm (about 2/3 down the page).

I'm thinking of using in conjunction with my daystar Quark, as the standard el-cheapo 0.5x focal reducers seem to perform pretty shoddily with it. I was hoping daystar would be true to their word and come good on the 0.5x reducer they were talking about to me, but, it looks like that project with them is on the back burner. (see the convo on their FB page).

I'm presuming this product has specifically been designed for 656nm, certainly looking at the images with it seems to perform very well.

Anyone got one? used one? any thoughts / info you can add?

Thanks

Mark
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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by mdwmark » Wed Feb 18, 2015 11:54 pm

The telecompressor from Baader is a really good design. Just screw it to the back of the filter and you should have no problems with the Daystar filter.
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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by Valery » Thu Feb 19, 2015 2:00 am

marktownley wrote:Hi There folks.

I was wondering if anyone has a little more information about this product? This is what i've found - http://www.baader-planetarium.de/sektion/s37/s37.htm (about 2/3 down the page).

I'm thinking of using in conjunction with my daystar Quark, as the standard el-cheapo 0.5x focal reducers seem to perform pretty shoddily with it. I was hoping daystar would be true to their word and come good on the 0.5x reducer they were talking about to me, but, it looks like that project with them is on the back burner. (see the convo on their FB page).

I'm presuming this product has specifically been designed for 656nm, certainly looking at the images with it seems to perform very well.

Anyone got one? used one? any thoughts / info you can add?

Thanks

Mark

Mark,

Don't hurry up to buy this al-cheapo 0,7x compressor. I am sure it is the same simple system like cemented doublet.
They do not show us a full story and do not show us a full field of view.
Of course it;s smaller factor of reducing 0,7x vs earlier discussed 0,5x, creates the impression that it is a specifically designed.
The smaller the reducing factor, the smaller the aberrations

Valery.
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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by swisswalter » Fri Feb 20, 2015 4:47 am

Hi Mark

thanks for the link. Is a shapleylens something different from a reducer ? The reason I ask is, that I have a shapleylens from a C8. It may be worth trying it on a refractor
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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by Valery » Fri Feb 20, 2015 5:50 am

swisswalter wrote:Hi Mark

thanks for the link. Is a shapleylens something different from a reducer ? The reason I ask is, that I have a shapleylens from a C8. It may be worth trying it on a refractor

Shapley lens (SL) definition: a positive lens system for reducing of the focal length in a long focus tele-system.
So, the SL is just a focal reducer - according to amateur astronomers language.

The SL for C8 will introduce the coma which it corrects in the native C8. It also will introduce a field curvature which it
corrects in the native C8.

For Quark the SL must corresponds to such requirements:

1. To not introduce a field curvature.
2. To not introduce a positive SA at 656nm. Negative SA is wanted but only in the case it corrects or decreases a native SA of the
systems: refractor + Quark or SCT + Quark.
3. To not introduce a field astigmatism. A positive field astigmatism is wanted but only in the case it corrects or decreases a native field
astigmatism of the systems: refractor + Quark or SCT + Quark.

This is impossible in a simple cemented doublet positive lens.

So, any simple cemented doublets will introduce (more or less) it's own SA, field curvature and astigmatism.

Such a reducer for Quark need to be designed with at least 2 separate lenses. Or better the design must be more complicated and
corresponds to all 1,2 and 3 requirements.

Hope this helps.

Valery.
Last edited by Valery on Fri Feb 20, 2015 8:32 pm, edited 1 time in total.
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Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by marktownley » Fri Feb 20, 2015 12:39 pm

Thanks folks for the input :)

In the ideal world Valery I would be able to measure all the necessary optical parameters of my scopes, design to the reducer in a bespoke way, and then get it manufactured to my exact tolerances and specification. However the reality of it for me is that these things are not possible.

In the scheme of things the Baader telecompressor is far from an 'el-cheapo', infact it is 10x the price of the majority of the el-cheapo reducers I can buy in the UK. In the absence of the daystar unit, I reckon this is about as good as I can get...
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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by fjabet » Fri Feb 20, 2015 6:13 pm

Had it for a while with the Ion and TZ4, and it was working fine.
Looking for professional reports about telescopes ?

http://www.airylab.fr/AirylabUS/index.p ... &Itemid=57

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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by fjabet » Fri Feb 20, 2015 6:15 pm

PS : used it with a CMOSIS CMV4000 which it not a small sensor.
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http://www.airylab.fr/AirylabUS/index.p ... &Itemid=57

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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by marktownley » Fri Feb 20, 2015 7:51 pm

fjabet wrote:PS : used it with a CMOSIS CMV4000 which it not a small sensor.
That's a useful thing to know Frederic, the 0.5 reducer I have at the moment just de-focuses in the corners when used at 0.5x, and also starts to darken quite considerably; and that's using it with a DMK31 which is a small sensor :D

Think I will pull the plug and get one ordered this weekend...

Then I will look at how I can mount it with the quark / PST etalon combination (which is why I posted this in the mods section ;) )
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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by Valery » Fri Feb 20, 2015 8:47 pm

This is a matter of belief. I know for sure what all these simple reducers are, include 0,7x.
I personally disbelieve and took some efforts and created a special reducer for my Quark.
My a three lens one works at 0,3x to 0,5x with the Quark and shows perfect field. It beats
_clearly_ a very nice, specially selected PST 0,3A mod2 resolution wise.


Valery.
Last edited by Valery on Sat Feb 21, 2015 3:49 am, edited 1 time in total.
"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: Baader / Solar Spectrum Telecompressor 0.7x

Post by marktownley » Fri Feb 20, 2015 9:19 pm

Valery wrote:This is a matter of belief. I know for sure that these ar eall simple reducers. And 0,7x
I personally disbelieve and take some efforts and created a special reducer for my Quark.
My three lens one works at 0,3x to 0,5x with Quark and shows perfect feild. I beats
_clearly_ a very nice, specially selected PST 0,3A mod2 resolution wise.


Valery.
Can you share the design for it Valery?
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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by grimble_cornet » Fri Feb 20, 2015 11:55 pm

Mark, for what its worth:
This is what I get with the Equinox 80 and Quark when using the £20 Telescope House Revelation x0.5 reducer on a long (30mm) nosepiece fitted to the Grasshopper at 1280x960. The image is un-cropped so should give an interesting comparison to the reducer you are using re field-curvature?
Equinox 80 Quark Grasshopper at 1280x960 x0.jpg
Equinox 80 Quark Grasshopper at 1280x960 x0_5 reducer Long NP.jpg
.

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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by mdwmark » Sat Feb 21, 2015 3:04 am

Well, I only use mine with my old astrovid so if the field is curved I probably never saw it.
When it come to reducing the image size for visual. I just use a longer focal length eye piece.
Now, I have never seem on the posts anyone doing it like ISSON or Hida's set up.
What they use to fit the camera chip size is have a field lens near the primary focal point (after the filter) and use a camera lens to focus on the image. I have a design for a telecompressor that was for my ED80 to fill the 1/4" chip with the full disk. It was design by a real optical designer. It would had cost 10X or more then my whole system to make.
Then he said why don't you use a +250mm field lens and a 50mm lens on the camera that will focus up close and you can make the image size to fit the chip(this is from memory). So I know with the right focal length lens you can fit any size chip with a full disk(if you have one to start with).
One of these days I going to get a new camera and play around with this approach.
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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by Valery » Sat Feb 21, 2015 3:59 am

grimble_cornet wrote:Mark, for what its worth:
This is what I get with the Equinox 80 and Quark when using the £20 Telescope House Revelation x0.5 reducer on a long (30mm) nosepiece fitted to the Grasshopper at 1280x960. The image is un-cropped so should give an interesting comparison to the reducer you are using re field-curvature?
It is immediately seen that the sharpness in the center is significatly better than at the edges of the chip.


Valery.
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Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by swisswalter » Sat Feb 21, 2015 8:01 am

Hi Freaks

most interesting discussion here.
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: Baader / Solar Spectrum Telecompressor 0.7x

Post by marktownley » Sat Feb 21, 2015 2:37 pm

Thanks Mike, looks to be slightly better results with yours than mine.
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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by grimble_cornet » Sat Feb 21, 2015 3:17 pm

Mark; I assume that you are using the DMK31 at 1024x768 pixels?
I have put a frame on my previous images showing the area that would be captured by the DMK31 with the same set-up:
Equinox 80 Quark Grasshopper at 1024x768 mono.jpg
Equinox 80 Quark Grasshopper at 1024x768 colour.jpg
They may not be perfect but I think they look pretty good for a £20 reducer.
I've just been playing with a 2" x0.5 reducer from Teleskop Express which seems to be of a similar quality:
http://www.teleskop-express.de/shop/pro ... hread.html
I'm not sure how I would attach it to my Quark/Grasshopper combination although the friend who loaned it to me also got a 2"-T adaptor which I could use (along with a T-C which I already have) to connect it to the Grasshopper. I would just need to get a 2" eyepiece adaptor for the Quark.
Seem to remember various people talking about having these made when the Quark first appeared but I assume that they are available commercially now?
Not quite sure what you would get for 5 times the price (10 times if the 1.25" works for) by going for the Baader Solar version as I really can't work out what makes it 'better' or 'Ha optimised' from the info they give. Don't get me wrong, I have loads of Baader gear and it is all of a very high standard - well worth the premium price - but I just don't understand what makes this reducer 'special'?
.

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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by marktownley » Sat Feb 21, 2015 9:10 pm

No, I know what you mean Mike, I just wish there was a little more information out there on it, it's certainly a bit of an enigma. It's one of those things where google doesn't really offer more elaboration...

Thanks for the inset on your image, like you say the result is not too bad. I just want to try and get as much out of my Quark as is possible. I think one of my next steps will be to use the Baader D-ERF upfront with the ED80 and see how much difference keeping as much heat out of the tube as possible does. Too many things I want to experiment on and not enough clear skies to do so!
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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by grimble_cornet » Sat Feb 21, 2015 10:28 pm

Tell me about it :lol:

My Quark got to Daystar yesterday - only took 8 days via 'priority' :roll:

My Moonlite focuser took 36 hours to reach customs in the UK .....been there for 2 days so far so.... might arrive eventually (with a bill) :evil:
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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by marktownley » Sun Feb 22, 2015 4:03 pm

Oh there will be a bill, I think mine was an additional hundred quid ish...
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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by swisswalter » Sun Feb 22, 2015 4:12 pm

"free solar gear from toll" :idea:

please join in , spread the word
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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by marktownley » Sun Feb 22, 2015 6:19 pm

grimble_cornet wrote:I would just need to get a 2" eyepiece adaptor for the Quark.
Seem to remember various people talking about having these made when the Quark first appeared but I assume that they are available commercially now?
Well hang fire on this one Mike, i've just ordered via flea-bay some step up adapters, which if they work will provide a way of attaching t-thread to the quark eyepiece holder threads for about a fiver... As soon as they arrive i'll report back positive or negative...
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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by grimble_cornet » Sun Feb 22, 2015 10:25 pm

Thanks Mark - no rush as my Quark could be 'away on holiday' for some time :roll:
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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by marktownley » Mon Feb 23, 2015 12:26 pm

Ok, for good or for worse I have ordered the Baader telecompressor, I will do a full and unbiased review of its performance... Stay tuned! :)
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Re: Baader / Solar Spectrum Telecompressor 0.7x

Post by grimble_cornet » Mon Feb 23, 2015 12:37 pm

It was just a matter of time.................. :lol: :o :lol:
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