I have one of these from ebay
I believe it's an Olympus BH focus block as seen eg here
The small divisions are 2 micrometer(2 micron) movement.
I notice it's grey instead of pale mustard colour, which may give a clue to someone.
Edit... 2 not 1
Focus block on ebay
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Focus block on ebay
Last edited by ChrisR on Wed Feb 24, 2010 4:35 pm, edited 1 time in total.
- augusthouse
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I believe some have 100 divisions, this one has 200, per rev. It's the same "knob" as on an Oly CH. With glasses on you could manage say quarter micron steps.
Small difference, there's no clamp on what would be the right hand side of the microscope.
It does have 3 grub screws to adjust the lateral squeeze on the ball-slide though.
Small difference, there's no clamp on what would be the right hand side of the microscope.
It does have 3 grub screws to adjust the lateral squeeze on the ball-slide though.
- augusthouse
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The focus block on eBay went for a respectable amount. USD $305.00.
A similar item, previously sold by the same seller, went for approx. USD$159.00.
I've always associated the gun-metal grey to earlier versions; the beige versions coming into to vogue in more recent times.
Craig
A similar item, previously sold by the same seller, went for approx. USD$159.00.
I've always associated the gun-metal grey to earlier versions; the beige versions coming into to vogue in more recent times.
Craig
To use a classic quote from 'Antz' - "I almost know exactly what I'm doing!"
Jörn, are you telling me I can't count ???
That would be silly
OOOOOOPS!!:smt100
Somebody somewhere said 1 micron, and it stuck. Well spotted!
Betty - it's the full travel, of approx 30mm. The fine knob drives the coarse one, rather than a separate mechanism like some microscopes.
(I had to use my toes and borry my wife's fingers for that one)
That would be silly
OOOOOOPS!!:smt100
Somebody somewhere said 1 micron, and it stuck. Well spotted!
Betty - it's the full travel, of approx 30mm. The fine knob drives the coarse one, rather than a separate mechanism like some microscopes.
(I had to use my toes and borry my wife's fingers for that one)
- Charles Krebs
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The labels on these things get pretty confusing. My CH, also giving 200 microns per turn, is labeled by 20's with 8 ticks between, so 2.5 microns per tick.
On quick glance it looks just like ChrisR's, but on careful count there are only 4 intervals in each smallest group instead of 5.
Betty, the total stage travel on my CH is just over 30 mm. It can move that whole distance with the fine focus knob, given enough patience to make 150 turns.
--Rik
On quick glance it looks just like ChrisR's, but on careful count there are only 4 intervals in each smallest group instead of 5.
Betty, the total stage travel on my CH is just over 30 mm. It can move that whole distance with the fine focus knob, given enough patience to make 150 turns.
--Rik
- augusthouse
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