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Anyone using BCO 10mm orthos?

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#1 mike bacanin

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Posted 18 August 2019 - 04:15 PM

I'm considering a pair of 10mm eyepieces to use with my SW127 mak, which is operating close to F15 in its current configuration using a 2" prism and WO bino. I prefer not to use the 1.6x supplied barlow. I am interested in BCO 10mm's, as I like orthos (I use a pair of 12.5 Fujiyama HD)and these are very well priced and have smooth barrels.

Anyone using the BCO 10's and can provide some feedback? I'm assuming the softer outer 10% of fov in faster scopes should clean up at F15.

I'd really appreciate your comments.

 

Thanks

Mike



#2 mike bacanin

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Posted 24 August 2019 - 12:59 PM

just to let you know I've asked the question in the eyepiece forum, as it may be a more suitable place to ask.

 

Mike



#3 noisejammer

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Posted 27 August 2019 - 03:08 PM

Mike, I don't have the BCO's but I do (occasionally) use 7mm BGO's and 10mm ZAO's in my binoviewers. They work really well at f/9.1 and f/12.4.



#4 39.1N84.5W

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Posted 02 September 2019 - 07:46 AM

I use 9mm kokusai orthos and from what I've researched the bco is the same factory in Japan? Absolutely love my 9mm pair. Using in 8" f6 refractor that I stop down to 5" f8.5 and a chromacor.

#5 mike bacanin

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Posted 06 September 2019 - 10:47 AM

Thank you for your comments. A few days ago I was able to locate a pair of 10mm Japan ultrascopics in superb condition. To find a pair here in UK is extremely rare. I'm very pleased as these have a decent fov with very sharp field stops and smooth barrels. Looking forward to trying them when the weather here allows.

Mike

#6 StarAlert

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Posted 19 October 2019 - 12:18 AM

I have a 10mm BCO and a 9mm nagler. I have to say, the BCO is incredibly sharp. When viewing the moon and planets , the BCO seems sharper than the nagler to me. The eye relief was something that took me some time getting used to (I think my eyelashes brush the glass sometimes). I don’t think I could go any shorter. 

 

I usually will work my way down with the wide FOV Naglers and then I try the $55 BCO and it amazes me every time. You won’t be disappointed with the BCO if you’re ok with the short eye relief. 



#7 gul1337

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Posted 26 October 2019 - 11:09 PM

I use 10mm BCO with Mak 127 and WO bino, eye relief is a little tight, but overall I'm happy. I would buy them again. It is a little harder to get two eyes to "merge" than with kit WO 20mm, but they are really sharp. A real killer on the moon.

 

Gul1337

 




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