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Looking for a large aperture achromat telescope.(solar imaging)

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#1 BoskoSLO

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Posted 18 February 2021 - 09:57 AM

Hi!

 

So I just recently got myself a new toy, a daystar quark -chromosphere. While it works flawlessly on my 115mm triplet I would preffer not using it for solar imaging because I don't want the intense sunlight damage the optics in any way possible. I will use my 80mm doublet instead but I want to do some high resolution imaging and I have seen people taking great images using F8 120mm achromats like the celestron one.

 

I have been looking everywhere and all of the 110 - 150mm ~f8 achromats are either sold out or not in stock for another ~2 months (bresser). Besides that I searched for used ones and no luck. If there is one available I want it to be in Europe.

 

Are there any other options or do I just have to wait a few months and  meanwhile check the market every day?

 

 

Clear skies!



#2 Astrojensen

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Posted 18 February 2021 - 10:20 AM

Your 115mm triplet could observe the Sun all day and nothing would happen to it. The heat is NOT concentrated on the optics. Just remember to use a 2" UV/IR filter in front of the diagonal to protect the Quark from too much heat. I use my Quark on a 152mm APM ED, with a 2" Baader UV/IR filter in front of the 2" diagonal, and it works great. 

 

I also have a 152mm achromat, that I've also used for solar observing, and the views are equally good, except I have to stop it down a little, due to turned down edge. 

 

As for the current delivery situation, the only alternative to waiting a few months, is to find a used telescope. They do pop up now and then. 

 

 

Clear skies!

Thomas, Denmark


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#3 starbug

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Posted 18 February 2021 - 02:45 PM

https://www.teleskop...-mit-Optik.html

In stock


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#4 BoskoSLO

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Posted 20 February 2021 - 09:54 AM

Yeah I have my eyes on that scope as well. I will keep my eyes on the used market for now and when summer is about to hit I may buy this scope from teleskop express.



#5 starbug

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Posted 21 February 2021 - 01:21 AM

I might want to sell mine, which is almost unused due to the weather in the couple of last months here. Originally I ordered the Bresser, which was in back order and the delivery date moved every week, so I lost my patience and ordered the Celestron, which was in-stock. Wanted to cancel the order for the Bresser after Celestron arrives. Both were at my door same day. Now I have 2, one of them is obsolete. As mentioned, I didn't have the chance to compare them optically, but like the mechanics (Tube, focuser) of the Bresser much more, even though it's much heavier.



#6 Spikey131

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Posted 21 February 2021 - 08:22 AM

You might put a post on the “Solar Observing and Imaging” page.  A lot of smart folks with solar imaging experience lurking over there.


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#7 SeattleScott

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Posted 21 February 2021 - 01:37 PM

For some reason I thought doublets were safe for solar (with appropriate filtration on the back end) while triplet was not so safe. Not positive about that though.

Scott

#8 Astrojensen

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Posted 21 February 2021 - 01:40 PM

For some reason I thought doublets were safe for solar (with appropriate filtration on the back end) while triplet was not so safe. Not positive about that though.

Scott

A triplet works just fine for solar observing. I used a TMB 100/800 triplet for solar observing with a Herschel wedge, as well as Quark Chromosphere (not at the same time, obviously!), and both worked fine.

 

 

Clear skies!

Thomas, Denmark 



#9 barbie

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Posted 22 February 2021 - 01:50 PM

Yes. Years ago, I used a 4" F8 Tak triplet for solar observing and imaging in white light and H-alpha and it worked superbly!! I got my best and sharpest images ever of the solar disk, sunspots, faculae, and prominences.


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