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sterling plossls versus BCOs

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#1 coutleef

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Posted 17 January 2014 - 12:08 PM

a quick question.

i am currently using sterling plossls 17 mm, 20 mm and 25 mm in my binoviewer but mostly use the 25 mm. since i will have pairs of 12.5 and 10 mm orthos, i do not need the 20 and 17 with the 2x oca to reach higher mags.

would it be a good move to replace the 17 and 20 sterlings with a pair of 18mm BCOs?? would the bco be better on planets than the sterlings

i use my bino mainly to view planets and the moon
thanks for the advice

#2 penguinx64

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Posted 17 January 2014 - 03:51 PM

Is it just me, or does the 20mm Sterling Plossl

http://store.smartas...0stpl55def.html

look identical to the 20mm Astro Tech Plossl?

https://www.astronom...plossl-eyepi...

Are these the same eyepieces under different brand names?

#3 Starman1

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Posted 17 January 2014 - 04:00 PM

Is it just me, or does the 20mm Sterling Plossl

http://store.smartas...0stpl55def.html

look identical to the 20mm Astro Tech Plossl?

https://www.astronom...plossl-eyepi...

Are these the same eyepieces under different brand names?

Yes.

#4 EuropaWill

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Posted 17 January 2014 - 09:35 PM

My guess is you will get 50% of the people saying "keep the 20mm and 17mm Sterlings" and 50% of the people saying "get the 18mm BCO instead" but count me among those that implores you to keep your Sterlings. You'll kick yourself later on if you sell them.

Also, I wouldn't replace any of my eyepieces with something else until I've made back to back comparisions with the replacement candidate and the incumbent EP first.

#5 buddyjesus

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Posted 17 January 2014 - 10:37 PM

instead of the BCO consider going with a hutech abbe orthos that are clones of the HD orthos if your looking for a definitive step up in clarity IMO. I am perfectly happy with my 25mm sterling.

#6 tag1260

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Posted 17 January 2014 - 11:24 PM

instead of the BCO consider going with a hutech abbe orthos that are clones of the HD orthos if your looking for a definitive step up in clarity IMO.


How are these for a f/5 reflector?

Thanks

#7 ibase

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Posted 18 January 2014 - 01:32 AM

Have both of them, the Sterling 17mm & BCO18mm:

Posted Image
BCO 18mm & Sterling 17mm

Haven't made a direct comparison owing to not being of identical focal length, but would say that they are optically at par and both good. Consider that the BCO seems to have a better design, including the removable eyeguard wings which could be an advantage for binoviewing if that is the intended use.

Best,

#8 Damo636

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Posted 18 January 2014 - 06:06 AM

instead of the BCO consider going with a hutech abbe orthos that are clones of the HD orthos if your looking for a definitive step up in clarity IMO.


How are these for a f/5 reflector?

Thanks


In a work, excellent! I have two of the shorter focal lengths, the 9 & 7mm, & very happy with them.

#9 coutleef

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Posted 18 January 2014 - 08:11 AM

Have both of them, the Sterling 17mm & BCO18mm:

Posted Image


BCO 18mm & Sterling 17mm

Haven't made a direct comparison owing to not being of identical focal length, but would say that they are optically at par and both good. Consider that the BCO seems to have a better design, including the removable eyeguard wings which could be an advantage for binoviewing if that is the intended use.

Best,


Thanks Hernando,

Lookslike i would be changing four $0.25 for $1.00.

I thougth perhaps scatter would be better controlled in the BCO. :question:

#10 John Huntley

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Posted 18 January 2014 - 03:17 PM

I have used both the Astro Hutech and Fujiyama 25mm HD type orthos.

They perform very well and are nicely made but their eye relief combined with the fact that their eye lenses are situated in an eye piece top that is only shallowly dished means that you need to "hover" your eye someway off the top of the eyepiece. I find this slightly uncomfortable over a long period and, more practically, it can let light get onto the eye lens which reduces the contrast and creates annoying reflections.

Some form of eye cup, retro-fitted, would help eliminate this but it's worth knowing about prior to purchase.

#11 ibase

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Posted 18 January 2014 - 10:26 PM

Have both of them, the Sterling 17mm & BCO18mm:

Posted Image


BCO 18mm & Sterling 17mm

Haven't made a direct comparison owing to not being of identical focal length, but would say that they are optically at par and both good. Consider that the BCO seems to have a better design, including the removable eyeguard wings which could be an advantage for binoviewing if that is the intended use.

Best,


Thanks Hernando,

Lookslike i would be changing four $0.25 for $1.00.

I thougth perhaps scatter would be better controlled in the BCO. :question:


François, weather-permitting, will pit the 2 in a scatter comparison and get back.

Best,

#12 coutleef

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Posted 18 January 2014 - 10:30 PM

thanks for your commitment

#13 ibase

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Posted 28 January 2014 - 10:39 PM

Had the chance to quickly compare the two EP's last night in-between cloud cover using a WO66 ED refractor:

Posted Image
BCO 18mm & SA 17mm

As mentioned earlier, the two are more or less at par optically, same with scatter control. (Target was Jupiter w/3 satellites visible.) And on both EP's, the king of planets exited the field cleanly with very little remnant light shown with the bright object just out of the field. The Sterling 17mm displayed a very slight advantage on the 2 Jovial bands in terms of distinctiveness but that may be attributed more to the difference in focal lengths and a bit higher magnification over the BCO 18mm.

Best,

#14 coutleef

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Posted 29 January 2014 - 07:36 AM

Thanks for your comments.

I will keep the sterling then






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