Vickers M70, polarizing

[Interference]

A fw of these had incident light attachments.
I can't find much infformation on the Vickers scopes, though some look pretty nice..
Does anyone know it's generally possible to swap parts between their similar-looking scopes?

[apochronaut]

I know a little about these but less than I would like to. The model M70 doesn't ring a bell but the M75 does. The M75 is an excellent basic lab microscope. and can be set up for transmitted light or incident light or both. It has some common parts with the M17. The objectives are pretty much common to all of the Vickers microscopes ; They are D.I.N.

[Interference]

I gather that if you change the illuminator you should change an internal magnifier part. I assume that's because the tube length would change too.
They seem to built like the proverbial outhouse, though there's a problem getting bulbs now.
Now, would a LED light source "work" the same way for a M-L chart? I shall have to try one with high CRI.

[apochronaut]

Led conversions are trickier than they seem and leds do not provide as much light as is claimed. Getting one with the correct CRI is also a challenge. Low wattage leds get along o.k. when the distance to the condenser is reduced. It would be hard to duplicate the emission characteristics of the original 20 watt halogen( is that what it is?) with led, so changing the illumination system's collector lens , removing it altogether, or putting the led closer to the subject, would make some sense. .


As far as the M-L accuracy, perhaps there are some people around in the U.K. that could advise you on which led's work. This adaption used a NIchia, for an older James Swift polarizing microscope. ( sorry, I originally forgot the link)
http://www.microscopy-uk.org.uk/mag/ind ... swift.html

I have a very good data base for bulbs. Most are still easily available. If you don't already know a source, if you send me a # , I'm sure I can find it.

[billbillt]

Led conversions are always a good option.... They are generally very simple to put together... They seem to perform very well with a small investment.. They have a tremendous lifespan... A case in point are the fantastic videos presented on this forum by Bill Porter... They are filmed with a LED converted Nikon... It is hard to fault his work or microscope..

BillT

[apochronaut]

He is talking about a polarising microscope and indicating specific concerns about colour accuracy and colour chart comparisons. It is a little different than posting nice pictures on an amateur forum.

[billbillt]

LED's are used even on high end microscopes that demand the things you state...

BillT

[apochronaut]

could you point me in the direction of these microscopes. I'd love to see them.

[billbillt]

Sure!.. Right here..

http://www.leica-microsystems.com/produ ... ica-dm4-p/

[billbillt]

This is about as high end as it gets... Complete with LED lighting!..

[apochronaut]

What a bunch of beauties. A lot of money put into those, and out the other end too. So, 4500K and " high output", which I would guess means in excess of 20 watts and likely 12 volt. They are replacing a 100 watt halogen, system which is still available as an option. They don't give too many details on the illumination system, not even the amperage.
There's a start to your D.I.Y. rebuild, Interference. 4500K is apparently the colour correct light , unless it has been tweaked with filters. You are needing much less in the way of output, than those scopes do. I guess you would be replacing 20 watts?

[Interference]

The original bulb is 6V 15W. I'm told similar to a Zeiss but the element's the "wrong direction".
Old tungsten non halogen.
I suspect that a diffuse source would be OK, - my doubts about Köhler illumination are for another thread!

Thanks I'll look for a reference number.

Some of the very best LEDs are 99% CRI now. How critical that would be, I don't know. These:
Are mostly different non-matching colours anyway
https://www.google.co.uk/search?q=miche ... 06&bih=602