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 Post subject: Re: Best Used Scopes?
PostPosted: Sun Apr 24, 2011 1:31 pm 
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I should have the scope on Tuesday.

I have a question about the oculars. Would there be any advantage to purchasing a set of 15 X oculars for this scope? Obviously, I would get more magnification but doing so would also require me to switch them out to the 10 X if I wanted view stones under the standard 10 X with quality optics.

Is that the reason that many gem scopes come with the 10 X oculars? So that you can view stones at Loupe level of 10 X with quality optics?


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 Post subject: Re: Best Used Scopes?
PostPosted: Sun Apr 24, 2011 1:44 pm 
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mitch57 wrote:
So that you can view stones at Loupe level of 10 X with quality optics?


if you wanna grade diamonds you've to stick to standard 10X so, you're correct.
Neverthless sometimes higher mag could be required, i would prefer to purchase a duplicator lens instead the 15x oculars.
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alberto

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 Post subject: Re: Best Used Scopes?
PostPosted: Sun Apr 24, 2011 2:24 pm 
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Where would I buy a duplicator lens? Are they specific to the scope?


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 Post subject: Re: Best Used Scopes?
PostPosted: Sun Apr 24, 2011 2:40 pm 
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you could easily find one on ebay for 30-50 $, unfortunately i cannot find an auction right now to show it to you, ASA i find one i will post here.
ciao
alberto

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 Post subject: Re: Best Used Scopes?
PostPosted: Sun Apr 24, 2011 8:47 pm 
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Thanks Alberto. I appreciate it.


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 Post subject: Re: Best Used Scopes?
PostPosted: Mon Apr 25, 2011 11:13 pm 
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AO equipped Gemolites have initial magnification of 0.67x at their lowest zoom setting.
With a 15x ocular this is the standard 10x magnification. You do not need 10x oculars.
They were shipped (by GIA)with 15x oculars.

Quote:
Why do some of the scopes say "GIA Mark V Gemolite" and others say "GEM Instruments Mark V Gemolite?
Are they just different model years and therefore changed the labels over the course of the years?

Gem Instruments is and always was a wholly owned subsidiary of GIA. The labels are not important.


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 Post subject: Re: Best Used Scopes?
PostPosted: Tue Apr 26, 2011 12:05 am 
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G4Lab wrote:
AO equipped Gemolites have initial magnification of 0.67x at their lowest zoom setting.
With a 15x ocular this is the standard 10x magnification. You do not need 10x oculars.
They were shipped (by GIA)with 15x oculars.


Please see the link's description of the eye pieces. Scroll down to the bottom where he has the description listed.

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... MEWAX%3AIT

He states: "Has (2) 10X Eyepieces with Guards."

I've seen other scopes listed on ebay that have 10x oculars as well. Am I confused about what I'm considering as the oculars?


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 Post subject: Re: Best Used Scopes?
PostPosted: Tue Apr 26, 2011 12:51 am 
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If the scope comes with 10x oculars then you get the standard 10x
mag with the zoom knob set at 1.0x

15x AO oculars are easy to find for not too much money.

It is optically better to use an auxiliary lens (if you want more mag) because this increases the resolving power somewhat. But 15x oculars work fine too. If you put 15x oculars on you can still have the "standard" 10x magnification with the zoom knob set at 0.7x

This is not the case with an auxiliary lens. With a 2x in place the minimum mag will be 1.4x times the ocular so either 14x or 21x (for 10x and 15x oculars respectively)


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 Post subject: Re: Best Used Scopes?
PostPosted: Tue Apr 26, 2011 10:07 am 
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Thanks for the clarification G4Lab.

Once I get the scope and play around with it this weekend I will decide if I need to purchase any more optics.


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 Post subject: Re: Best Used Scopes?
PostPosted: Tue Apr 26, 2011 11:48 am 
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G4Lab wrote:
This is not the case with an auxiliary lens. With a 2x in place the minimum mag will be 1.4x times the ocular so either 14x or 21x (for 10x and 15x oculars respectively)


but with an 1.5X in place you could have a minimum mag of 10x with standard 10x oculars.
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alberto

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 Post subject: Re: Best Used Scopes?
PostPosted: Tue Apr 26, 2011 4:40 pm 
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Alberto wrote:
G4Lab wrote:
This is not the case with an auxiliary lens. With a 2x in place the minimum mag will be 1.4x times the ocular so either 14x or 21x (for 10x and 15x oculars respectively)


but with an 1.5X in place you could have a minimum mag of 10x with standard 10x oculars.
ciao
alberto


So much for clarification... So what is the minimum magnification with the original optics that come with this scope?


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 Post subject: Re: Best Used Scopes?
PostPosted: Tue Apr 26, 2011 4:42 pm 
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mitch57 wrote:
So much for clarification... So what is the minimum magnification with the original optics that come with this scope?


0.67X

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 Post subject: Re: Best Used Scopes?
PostPosted: Tue Apr 26, 2011 5:26 pm 
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Alberto wrote:
mitch57 wrote:
So much for clarification... So what is the minimum magnification with the original optics that come with this scope?


0.67X


Even though the scope label reads "0.7X"? From what I've been seeing, scouring the internet, the Bausch and Lomb scopes come standard with "0.67X" and the AO scopes come with "0.7X".

I guess I need to learn more about optic design and magnification. As I understand it, which may not be correct, the scope I just bought has a minimum magnification of 7X. If I were to replace the oculars with 15x eyepieces I would have a minimum magnification of 10.5X.

Do I have it all wrong? Am I missing a piece of the equation here?


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 Post subject: Re: Best Used Scopes?
PostPosted: Tue Apr 26, 2011 5:30 pm 
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mitch57 wrote:
If I were to replace the oculars with 15x eyepieces I would have a minimum magnification of 10.5X.

Do I have it all wrong? Am I missing a piece of the equation here?


nope, you're correct :D
ciao
alberto

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 Post subject: Re: Best Used Scopes?
PostPosted: Tue Apr 26, 2011 8:14 pm 
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Quote:
but with an 1.5X in place you could have a minimum mag of 10x with standard 10x oculars.
ciao


But it would be more like 10.5x


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