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Recommended Microscope

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#1 Kyphoron

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Posted 06 October 2019 - 09:53 PM

Hi all,

 

  I have been collecting for years and now I would like to get a microscope to look at my meteorites more closely. Looking on Ebay there are a ton of stereo microscopes out there. What do you guys recommend?  

 

Thank all.



#2 TOMDEY

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Posted 06 October 2019 - 10:51 PM

Hi! I'm into microscopes (too) ... worked at Bausch & Lomb back when they actually made good (world class!) microscopes there.

 

I have noticed that a lot (nearly all) of the (new) microscopes sold on eBay and elsewhere look nice but don't perform well.

 

On the other hand, excellent used low power stereo microscopes appear here on CN and also Astromart at ridiculously low prices! I would recommend the B&L Stereo Zoom and also AO (American Optical). As far as I'm concerned... the older the better. But the ubiqitous B&L Stereo Zoom you sure can't go wrong. I have lots of these and they all perform magnificently.

 

Here's a picture of a few on mine, that just happen to be out on a shelf. I have bunches of them... all perfectly functional!       Tom

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#3 lonn

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Posted 06 October 2019 - 11:14 PM

Sell one to Kyphoron ? wink.gif



#4 jimr2

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Posted 06 October 2019 - 11:30 PM

Tom,

What range of magnifications would be most useful for examination of meteorites, especially on cut surfaces??

Am interested in this also....

Thanks!

 

-jim-



#5 Kyphoron

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Posted 07 October 2019 - 02:11 AM

Hahah, well I have been looking here and I haven't seen one posted in awhile or I end up missing the deal. That's why I resorted to eBay. 



#6 TOMDEY

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Posted 08 October 2019 - 07:16 PM

Tom,

What range of magnifications would be most useful for examination of meteorites, especially on cut surfaces??

Am interested in this also....

Thanks!

 

-jim-

Well, these instruments range from around 5x all the way up to 100x... and I'm guessing the entire range would be useful... depending on what you're scrutinizing. Below  5x, a plain low power magnifier is apropos... and above 100x it's challenging to get true stereo without compromising resolution, because the needed high ~numerical aperture~ cones would literally bump into each other. So above 100x, the binoviewed monoscopic microscope takes over.

 

NOTE: Bunches of people here on CN are quite well-versed in telescope optics... but few re' microscope optics. There is a lot of yin-yang linking these two instruments! Lots of similarities and differences. The yin-yang complementarities and reflexive symmetries are especially fascinating. e.g. The image formed by a telescope objective is very thin... the image formed by a microscope objective is... very thick! Crazy stuff like that... which help one understand both. e.g. Why do very simple microscope eyepieces perform just fine? A: Because they are being fed at F/16 or slower... regardless of the objective's power.

 

PS: whatever you get... make sure it is "metallurgical" ... which means well-corrected for use in air, without a cover glass!   Tom



#7 TOMDEY

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Posted 08 October 2019 - 07:17 PM

Hahah, well I have been looking here and I haven't seen one posted in awhile or I end up missing the deal. That's why I resorted to eBay. 

Astromart has an entire ad category with listings for microscopes.    Tom



#8 Kyphoron

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Posted 09 October 2019 - 09:33 AM

Astromart has an entire ad category with listings for microscopes.    Tom

Thanks Tom,

 

  I rather not have to contribute 15.00 to Amart to buy something I want. I don't mind donating and giving business to CN because they are not asking me to shell out money to use their service.



#9 TOMDEY

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Posted 09 October 2019 - 10:37 AM

Thanks Tom,

 

  I rather not have to contribute 15.00 to Amart to buy something I want. I don't mind donating and giving business to CN because they are not asking me to shell out money to use their service.

Yeah, that's a thrifty decision. Me, I take this path >>> Astromart has a big selection at ridiculously low prices, and sends out elective early email notices at the higher level of membership. So I can buy choice offerings before most other people even see them! I've bought somewhere around ten microscopes there, over the years. If anyone is wondering how the best stuff winds up already sold, the moment it appears, that could be what's going on... it's guys like me!  It's like high-rollers getting preferred complimentary amenities at the casinos! Sometimes ~paying-up~ is the way to get front-row seats!  On the flip-side of the coin... If I want an auction item (e.g. eBay) I lurk till the very last minute, and then appear out of nowhere, with the high-bid. Bought a lot of high-end stuff that way! It's all in the technique. That's how I wound up with this big meteorite! >>>  Tom

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  • 106 toms meteorite.jpg



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