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BRESSER 4 Inch f 4.5 AR 102XS Refractor visual observers’ REVIEW

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27 replies to this topic

#26 DIMITRIS K.

DIMITRIS K.

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Posted 19 July 2018 - 06:04 AM

Thanks Peter.

 

Right so a semi-apo it is then. I'm just catching up with threads/posts on this scope. I'm interested for sure as part corrected wide field sounds like a nice step up from Skywatcher's ST80/120.

 

Rob

Hi i had the same questions and i send an email to BRESSER. Here is their answer. Hope it helps!

 

 

"Here is the mail with the reply from BRESSER:

 

Dear Mr. ...,

thank you for your interest in a BRESSER telescope.

About your questions:

 

- What type of ED glass do you use?
What exact ED glass it is is a business secret, I ask for your understanding. But of course, at this price range it is logical that it is a very cheap ED glass.

 

- How severe chromatic aberration i must expect?
It is like a normal achromatic refractor around F/7.

 

- Concerning ED glass, can you classified it as a semi apo telescope?
No! We classify it clearly only as achromatic refractor! We use ED glass at this telescope only because at F/4.5 you cannot really use normal glass.

 

- Is it suitable for astrophotography and EAA?
This telescope is made for wide-field observing. For example the North-America nebulae is a very nice object to observe at this telescope. It is also a very nice telescope for travelling.

 

Of course, you can also use it for imaging, but you will get some color at bright stars.

But this telescope is NOT a apo-chromatic flat-field astrograph!

Best regards
Wolfgang Quere"


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#27 rogeriomagellan

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Posted 22 July 2018 - 11:03 AM

I think it is only AR127 and AR152 in Bresser line that use Petzval design.

 

I have got AR102S and it is certainly not a Petzval design. AFAIK AR102XS is basically a shortened AR102S and in order to reduce the chromatic abberation they used ED glass on one of the doublet lenses. It is definitely not a ED scope though.

You're right. Only the Bresser Messier AR127 and AR152 have a Petzval design. 


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#28 SteveFour86

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Posted 26 August 2018 - 11:01 AM

Good stuff thank you for your time and efforts in sharing this with us in the interwebs.




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