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Baader Classic Ortho - Initial impression

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#1 ThomasM

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Posted 03 January 2013 - 11:54 AM

The new Baader classic ortho became recently available, I got the 10mm focal length a few days after Christmas. According to Baader it replaces the Baader Genuine Orthos (BGO). The price of the BCO is significantly lower than that of the BGO, 55 Euro compared to 95 Euro for the BGO which are not available any more.

BillP posted already a review on pre production eyepieces

http://www.cloudynig...5324232/page...

which indicated very a promising performance. What I am presenting here is an initial impression of the performance of a production eyepiece based on daytime observations with a very small f/6.5 mm refractor. The eyepieces comes with a winged rubber eyecup. Its apparent field of few is almost 50 degree (measured field stop diameter 8.7 mm), this significantly larger than that of other orthos. I have compared the 10 mm BCO with the 9 mm BGO and the 12 mm Kasai HD ortho which seems to be essentially identical with the 12.5 mm BGO. The built quality is on a little bit lower than that of the BGO, but very reasonable in view of the low price.
The eyelense of the 10 mm BCO is larger than that of the 12 mm Kasai, eye placement is very easy and comfortable. Since the focal lengths are not identical I can give only a very general impression. In the center the image is very crisp, the background (artifical star) is quite dark, scattered light is well controlled, comparable to the BGO. At the outermost edge the image gets a little bit soft. The coatings are very nice, they seem to me at least as dark as that of the BGOs. The transmission at 532 nm wavelength is very good, I measured 97 % (compared to 96.-96.8 % for the Zeiss Abbe 10 mm between 500 and 550 nm wavelength taken from the table by M. Ludes).

In summary, the 10 mm BCO is an excellent ortho eyepiece, optical on the same level as the BGO. Personally, I find the larger AFOV very nice.

Thomas

#2 BillP

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Posted 03 January 2013 - 11:57 AM

The off-axis should be soft...by design! Baader extended the field stop to open it up to a wider 50 degrees. Concept was to give larger FOV to make finding easier. The design was not changed to better correct this extra off-axis since only intent was to assist newbies to locate targets easier and move them into the sharper traditional 42 degree zone of an Abbe.

#3 johnnyha

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Posted 03 January 2013 - 01:56 PM

Thanks for the review! Sounds great, especially since it appears that the Circle T orthos are almost kaput. It will be interesting to directly compare these BCOs to the Circle T/UO Abbe Ortho/KK volcanos and the soon-to-be-released Kasai HC Orthos (BGO/UO HD clones).

#4 t.r.

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Posted 03 January 2013 - 02:09 PM

I never thought it would happen...the demise of the Circle "T"'s is a sad time. :bawling:

#5 howard929

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Posted 03 January 2013 - 05:07 PM

A king has his reign, then he dies. It's inevitable.

#6 John Huntley

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Posted 03 January 2013 - 07:19 PM

Interesting feedback :)

I have been sent a set of the 3 Classic orthos, the 32mm plossl, the 2.25x barlow plus some Baader GO's to compare with them.

I agree with your assessment of the build / finish quality. I'm clouded out at the moment though so no first light with them as yet :smirk:

#7 ibase

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Posted 03 January 2013 - 08:09 PM

Nice initial impression report, thanks. The relatively wider AFOV is a welcome feature.

Looking forward to reports on the 6-10-18-32mm set & 2.25x barlow, thanks.

Best,

#8 John Huntley

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Posted 03 January 2013 - 09:05 PM

The wider AFoV does not appear to extend to the Baader Classic 32mm plossl. The one I have been sent looks much more like 45 degrees to me.

#9 ibase

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Posted 03 January 2013 - 09:57 PM

Hmm.., if so, then it's a departure from the usual 50-52 deg. AFoV of 32mm plossls.

Best,

#10 John Huntley

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Posted 03 January 2013 - 10:02 PM

I've roughly measured the field stop of the Classic 32mm plossl at approx 24-25mm. The Tele Vue 32mm plossl is 27mm.

#11 ibase

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Posted 04 January 2013 - 01:33 AM

Thanks for the info, let us know how they perform, thanks.

Best,

#12 BillP

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Posted 04 January 2013 - 09:34 AM

FYI, Alpine has some in stock now. Just ordered the Q-Turret set for myself. :D

#13 ibase

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Posted 04 January 2013 - 10:05 AM

So I've heard that the BCO's have arrived on US shores today, although only a portion of their backordered quantity, but they have enough to get quite a few out there into folk's hands.

Best,

#14 ibase

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Posted 05 January 2013 - 08:50 AM

Just a speculation as to why the Classic plossl 32mm might have a narrower than 50-deg. AFoV - the lenses can be about as large as what the body’s barrel dimension will permit. In order to get a larger field, a larger barrel would be needed, and probably a different eyecup too, which would equate to higher cost for larger lenses. Such is also the case with the Clave 30mm plossl if not mistaken. The Barrel OD may be similar to the Classic Plossl, and the field size would be about 45-deg too, whereas the shorter Clave focal lengths had 50-deg fields of view just like the BCO's. To keep the selling price within reasonable limits, there are plenty of design tradeoffs and considerations applied, and these may possibly be the reason for the narrower FOV for the Classic 32mm plossl.

Best,

#15 SteveTheSwede

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Posted 05 January 2013 - 04:33 PM

It would be interesting to hear how the BCO 32mm plossl compares to the TV 32mm plossl.

#16 CelestronDaddy

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Posted 05 January 2013 - 04:40 PM

I've been waiting on these to get to the U.S. Thanks for the update and I look forward to reading about more impressions of the Baader orthos and plossls...

#17 ibase

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Posted 05 January 2013 - 08:56 PM

It would be interesting to hear how the BCO 32mm plossl compares to the TV 32mm plossl.


Yes, very much so, as I have a pair of the Televue 32mm plossls.

Posted Image

Best,

#18 Radim

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Posted 06 January 2013 - 05:02 AM

I never thought it would happen...the demise of the Circle "T"'s is a sad time. :bawling:


Guys, what falls into that category? Just cant remember what Circle T stands for ....

Thanks

Radim

#19 catboat

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Posted 06 January 2013 - 05:35 AM

I never thought it would happen...the demise of the Circle "T"'s is a sad time. :bawling:


Guys, what falls into that category? Just cant remember what Circle T stands for ....

Thanks

Radim


Circle-T (Tani) was the workshop that produced many of the Japanese orthos, kellners, and erfles that were sold since about 1970 (?) under various labels: University Optics, Kokusai Kohki, Orion, Coulter, Edscorp, Celestron and others.

For many like myself, the UO abbe orho is perhaps the best known and the most emblematic Circle-T product. We knew they were produced by a small shop but never expected them to be "no longer available".

A separate thread on all the Circle-T models and their various re-seller brands would be timely.

#20 Radim

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Posted 06 January 2013 - 07:37 AM

Thanks catboat for your clarification!

#21 johnnyha

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Posted 07 January 2013 - 05:00 PM

More initial impressions on Stargazer's Lounge ... looks promising!

#22 ThomasM

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Posted 11 January 2013 - 06:39 PM

After ten days of rains, clouds and snow the first clear sky.

My first impression, the 10 mm BGO is gives very plaesing views. Great contrast, black sky background and razar sharp in the center. With an aparent field of view of 50 degree it can also be used for deep sky viewing. It differs substantially from the tunnel view of many other orthos. Sure, at the edged the image is slightly soft.

All in all, the image quality is very similar to that of the 9 mm Baader Genuine Ortho.

Thomas

#23 Ain Soph Aur

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Posted 11 January 2013 - 07:45 PM

I am looking forward to reports on (and availability of) the Baader Q-Turret!

#24 DaveJ

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Posted 12 January 2013 - 10:29 AM

I am looking forward to reports on (and availability of) the Baader Q-Turret!


Got an email from Agena this morning. They should have them in stock shortly.

#25 SteveTheSwede

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Posted 12 January 2013 - 11:52 AM

Here's something mysterious though...

The whole kit (Baader Classic Q-eyepiece set) with eyepieces, barlow and Q-turret costs 349 Euro direct from Baaders site.
If, however, I add up the cost for the separate pieces (55 + 55 + 55 + 55 + 49 + 75) that comes to 344.

The kit also contains a fairly pointless tin box which can be bought for 10 Euro. In other words, unless you want the box it's cheaper to buy the items separately...

Posted Image

Steve






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