Petroscope

Here you can discuss all microscopy-related accessories and equipment (microtomes, filters...)
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Glot
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Joined: Thu Oct 17, 2019 7:23 am

Petroscope

#1 Post by Glot » Wed Jan 15, 2020 10:42 am

I know it's not microbe related but someone might know. I plan to buy a cheap petroscope for hobby use. I am wondering if there is any reason why they can't be used as a general purpose compound microscope? There a is a cheap Indian one that seems to have reasonable specs for the price. Of course low general quality.

MicroBob
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Joined: Sun Dec 25, 2016 9:11 am

Re: Petroscope

#2 Post by MicroBob » Wed Jan 15, 2020 11:21 am

Can you post a link of what you have in mind?
Do you think about a petrographic microscope?

Bob

microb
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Joined: Wed Mar 27, 2019 6:39 am

Re: Petroscope

#3 Post by microb » Wed Jan 15, 2020 3:38 pm

If you are looking at Radical, I'd avoid them unless you know someone that bought a particular model and was somehow ok with it.

I bought a "Radical 1500x Trinocular Steel Aluminium Alloy Metal Testing Lab Metallurgical Reflected Light Microscope with Polarizing and XY stage" off of Amazon in 2018, and it's not very good. A beat up Nikon or Olympus off of ebay would be way better. Regarding the Radical, I used an eyepiece camera for it. Months later I hooked up a camera to the trinocular vertical port, and that's when I found out the slider did not work. Taking it a part, the sliding prism slams into the housing and half-way blocks the light path. Plus the prism was chipped with glass inside. Clearly their QA just pulled it harder than I was willing to. That's when I found out they do not support their warranty. I sent pictures, but they said just loosen screws to readjust. I wanted to return, but they said it's been too long. I wanted a replacement head, they said adjust the screws. I wrote back that that doesn't work. But after a three months of nonsense, I decided to drill some holes reset the prism and donate it. But if someone asked, I vowed to warn them. Just let that company pass away into history sooner than later.

Also the "steel aluminum" frame shakes in the image with very little pressure in trying to focus. Plastic coin cameras with their metal tube pole jammed into a plastic base are just as good in that case. Maybe Amscope makes better cheaper stuff. I don't know. I'd buy a used Olympus or other name brand instead. There's lots of people out there to answer questions and help getting different cameras working even for the oldest of microscopes from Nikon or Olympus -- or or the others Zeiss and Leica and so on.

Ted

Glot
Posts: 28
Joined: Thu Oct 17, 2019 7:23 am

Re: Petroscope

#4 Post by Glot » Sat Jan 18, 2020 7:14 am

Yes Bob. Just terminology.

Glot
Posts: 28
Joined: Thu Oct 17, 2019 7:23 am

Re: Petroscope

#5 Post by Glot » Sat Jan 18, 2020 7:24 am

Thanks Ted. I am not sure of the brand but will check. I have found it very difficult to find second hand ones and I would be buying off a photo. I have been warned away from ex school or uni ones unless I am prepared to see d time and money on them. Apart from quality,as you warned, i was concerned some technicality of the objectives or something. I guess they use them for reflected light as well so should be okay for various slides on a basic level. I'd love one of everything as we all would.
One model I was browsing is an RPL3B. Doesn't say brand but the R makes me think Radical. I was just initially looking at something like this but not if its false value. I only want to play around but don't want to get frustrated by low quality.

Glot
Posts: 28
Joined: Thu Oct 17, 2019 7:23 am

Re: Petroscope

#6 Post by Glot » Sat Jan 18, 2020 7:45 am

This gives a lot of info as suggested further on. The hyperlinks in the text are worth look in at.
https://lavinia.as.arizona.edu/~mtuell/ ... ophot.html
Last edited by Glot on Sat Jan 18, 2020 8:26 am, edited 2 times in total.

Scarodactyl
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Re: Petroscope

#7 Post by Scarodactyl » Sat Jan 18, 2020 7:45 am

It is hard to find used geological scopes. Geologists just love their scopes and hold onto them tightly--part of that is that the standard loadout is still standard decades later even for research, not constantly evolving with new vital features like fluorescence and confocal stuff.

Petrographic scopes should be fine for other usage too. Some use specialized pol objectives but these are just made with low strain glass which doesn't affect their use in non-polarized light

A reasonable stopgap might be to get a Nikon labophot and one of the medical polarizing kits (used primarily for differentiating gout and pseudogout) which are sometimes available inexpensively. This gives you a polarizer, analyzer and gypsum plate, though no bertrand lens. Eventually you can either also get a rotating stage and a petrographic module to complete the set, or if you find a complete petrographic scope you can sell the labophot off for about what you paid or more if you bought well.

Glot
Posts: 28
Joined: Thu Oct 17, 2019 7:23 am

Re: Petroscope

#8 Post by Glot » Sat Jan 18, 2020 8:37 am

I have decided that a cheap apparatus is okay for low magnification stereo, once I go higher magnification, quality will play a big part. Buying second hand from a reputable dealer in the USA or Canada isn't out of the question.

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