Baader Grossfeld Binokular - Help Please!

[PhotoGav]

I have been tasked with selling a Baader Grossfeld Binokular from an observatory that I am involved with. It was purchased around 2002 and has never been usable with the glorious old telescope in the observatory because of insufficient back focus. I am unsure of exactly what model it is, certainly earlier than the Mark V version available these days at around £1200. However, can anyone help with an idea of a sensible asking price on the second hand market, please? It is in very good condition and the optics appear perfect. Here are a couple of pictures of the bino-viewer:

[alanjgreen]

It's a "Baader Mark IV Binoviewer"

This thread may be useful

https://www.cloudynights.com/topic/298743-baader-mark-v-vs-baaderap-mark-iv-advice-please/

 

http://www.astrobuysell.com/uk/propview.php?view=104505

http://www.astrobuysell.com/uk/propview_archive.php?view=86202

 

You also have a nice T2 diagonal in the pic, is it a mirror or a prism? These are expensive too! 

Either post some pics of the diagonal detached or try to identify from this link to all the different Baader Zeiss diagonals...

https://www.teleskop-express.de/shop/index.php/language/en/manufacturers_id/5/filter_id/9/astro/Baader.html

[PhotoGav]

Alan, you star, thank you for your help. I will have a better look at the diagonal next time I am in the Observatory and post some pics. It looks as though it is quite a valuable piece of kit. Hopefully adverts will be appearing here and on Astro Buy & Sell soon!

[Louis D]

You might want to contact Denis on CN.  He's a binoviewer vendor from Croatia who knows practically everything there is to know about them including repairs and modifications.

[PhotoGav]

45 minutes ago, Louis D said:

You might want to contact Denis on CN.  He's a binoviewer vendor from Croatia who knows practically everything there is to know about them including repairs and modifications.

Thank you Louis.

[25585]

I am looking to upgrade my Revelation, so am interested...

[PhotoGav]

13 minutes ago, 25585 said:

I am looking to upgrade my Revelation, so am interested...

OK, that’s great. I will hopefully be in the Observatory this Sunday evening, so will check what the diagonal is. We can then discuss a price. Thanks.

[PhotoGav]

Here are some pics of the diagonal - all identifications greatly received! There is nothing on the item itself to tell me what it is and I'm not well versed in diagonals!

[Louis D]

1 hour ago, PhotoGav said:

Here are some pics of the diagonal - all identifications greatly received! There is nothing on the item itself to tell me what it is and I'm not well versed in diagonals!

I'd guess it's a variation on Baader's T-2 90 degree prism diagonal with specialized input and output ports attached.

[alanjgreen]

Is the glass inside just a diagonal piece of mirror ( and you can push your finger inside) or a solid piece of glass that is flush to the openings?

- if you can get your finger inside the diagonal then it’s a mirror diagonal

- if the glass fills the interior to the openings then it’s a prism diagonal

its a “T2 diagonal” which accepts many T2 accessories. Yours has a “Baader Quick changer” fitted to one side ...

https://www.teleskop-express.de/shop/product_info.php/info/p7744_Baader-2456322---Schwerlast-T2-Wechselsystem.html

( it won’t be a heavy duty version as these were only released a couple of years ago, it’s the previous version which was much cheaper ! )

https://www.rothervalleyoptics.co.uk/baader-t-2-quick-changer-zeiss-micro-bayonet.html

and a T2 nosepiece the other side ...

https://www.teleskop-express.de/shop/product_info.php/info/p481_Baader-Adapter-2--auf-T2--fuer-2--Steckhuelse---Fokaladapter.html

Both the nosepiece and the Quick changer can simply be unscrewed from the diagonal to reveal the two T2 threads. When purchased it would have had two screw on caps

https://www.firstlightoptics.com/adapters/baader-t-2-dust-cap-female-m42-x-075.html

Alan

[PhotoGav]

Thank you Alan, that is all very helpful information. I will check whether I can get my finger in it or not...!

[25585]

Which model is the heavy duty one please Alan?

[alanjgreen]

58 minutes ago, 25585 said:

Which model is the heavy duty one please Alan?

https://www.rothervalleyoptics.co.uk/baader-heavy-duty-t-2-quick-changer.html

You need this one if your eyepiece pairs are large (Delos for example). I use the heavy duty one on my MarkV, it is far superior to the standard model. Just compare the thumb screws of the two models in pics...

Alan

[25585]

1 hour ago, alanjgreen said:

https://www.rothervalleyoptics.co.uk/baader-heavy-duty-t-2-quick-changer.html

You need this one if your eyepiece pairs are large (Delos for example). I use the heavy duty one on my MarkV, it is far superior to the standard model. Just compare the thumb screws of the two models in pics...

Alan

Definitely do need the heavy duty one then as I have Vixen LVW pairs 8, 13 & 22 to be used. Delos similar weights I expect. 

[PhotoGav]

I finally checked the diagonal and it is a prism. Thank you all for your help with this one. 

@25585 - if you are really interested in purchasing the bino viewer, please let me know and we can take the discussion to PM.

[25585]

@PhotoGavPM sent. 

[Highburymark]

Sounds like it's on its way to a new home, but if sale is not agreed I'd be interested in the Mk IV

[PhotoGav]

5 minutes ago, Highburymark said:

Sounds like it's on its way to a new home, but if sale is not agreed I'd be interested in the Mk IV

I'll let you know what happens...

[Highburymark]

Thanks Gav

[PhotoGav]

Thank you to everyone for your help in this thread. I am happy to say that the Binoviewer has gone to a new loving home today and there are now funds in the MCBO (Marlborough College Blackett Observatory) kitty that I hope to spend on imaging equipment very soon!