WTB/ barrow 30mm Centering telescope lens
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WTB/ barrow 30mm Centering telescope lens
So I was super fortunate and acquired a Zeiss AxioSkop-20 with phase contrast that fit my tiny, much depleted student budget. The kindness of strangers seems to know no bounds! I would like to insure my phase annuli are properly aligned and need a 30mm CT. I am in Santa Cruz California. If anyone wants to sell-one or is local and would let me barrow it briefly, I would be much appreciative.
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Re: WTB/ barrow 30mm Centering telescope lens
One way to do it without a centering telescope, is to remove one eyepiece and look down the tube. You'll see the phase annulus of the condenser and the phase plate of the objective.
Another quick way is to use a 10x loupe to magnify the aerial image of the annulus and phase plate above the eyepoint of your eyepiece.
Cheers,
John
Another quick way is to use a 10x loupe to magnify the aerial image of the annulus and phase plate above the eyepoint of your eyepiece.
Cheers,
John
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Re: WTB/ barrow 30mm Centering telescope lens
Another way is to stack the eyepieces one on top of the other. You can use a piece of tape or some tack to hold the top one.Modern eyepieces that I have tried this with work but many of the older ones, like Huygens don't..
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Re: WTB/ barrow 30mm Centering telescope lens
Thanks, I have heard of this technique but I hadn't tried it yet.
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Re: WTB/ barrow 30mm Centering telescope lens
Tried it out and could see how it would work. I would need to find the right size tube so I could hold the two lenses the right distance apart and in place.
Still if anyone has a CT I'm still considering buying one as a option.
Still if anyone has a CT I'm still considering buying one as a option.
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Re: WTB/ barrow 30mm Centering telescope lens
I made a sliding tube for this using an empty paper towel role and a good amount of scotcth tape. I admit it wasnt pretty but It actually worked quite well and was focusable.
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Re: WTB/ barrow 30mm Centering telescope lens
Use a ten x, 23mm eyepiece inside the tube and expand it to put the 30x in the end of the outer sliding tube.
Re: WTB/ barrow 30mm Centering telescope lens
I got the 30mm centering telescope lens, let me know if you're still interested in it henry_j66 at aol dot com for a better conclusion,
Thanks.
James Henry
Thanks.
James Henry
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Re: WTB/ barrow 30mm Centering telescope lens
I'd be very sceptical of buying something like this from a new member with three comments, all trying to sell hard-to-find items.
Seems very unlikely that someone would have a spare Zeiss Axiomat 50x PlanApo, a 30mm phase telescope, and a Russian MBC-10 camera attachment...
Seems very unlikely that someone would have a spare Zeiss Axiomat 50x PlanApo, a 30mm phase telescope, and a Russian MBC-10 camera attachment...