30 replies to this topic

[DIMITRIS K.]

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"

[rogeriomagellan]

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. 

[SteveFour86]

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

[S Gazer]

Looks like a good scope for the price.  Thanks for sharing the info.

[Sarkikos]

The first thing I did when I received my AR 102XS was install a Synta/Vixen-style finder base.  Here is the base I used:

 

https://www.adorama....ASABEgJg-fD_BwE

 

I really detest the proprietary, non-standard finder bases that some companies put on their telescopes.  The Synta/Vixen-style base is really the de facto standard now.  All the companies should accept it.

 

I chucked the supplied base, bracket and finder into a box in the closet. 

 

I put a Z-Bolt laser finder in the base.  That's the best finder for an RFT.  

 

Mike

[paulsky]

This refractor could be a good instrument for framing deep sky objects with low magnification, but within its context?

For example, if we use the Bresser with a good 30mm 82º wield field?

Regards,

Paul