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:)

not so many, actually.
Light, angle, reflectors, camera settings, blade fixation, methods of magnification - that's all.
+\- details like "using this method you should think about side...

My personal problem in sharpening is burr that less 20mkm. in size. You won't see it looking through 10x loupe.
And I want to see as many details as possible. Just because of curiosity.

I can...

Photos



In reviews ou can see a different quality of photo examples from microscopes and oth.
But you should know that it's not so representative as you think.
Because the image depends...

Buying at a store



You should think about:
- are lenses clean or not?
because items at a showcase can be smeared with fingers of previous buyers (almost always actually)
- is there...

Lead params



Sharpness, contrast, brightness.
(acrylyc optic isn't good here).
...
There could be a lot of params, but actually you can't understand is it good or not for you before use...

Loupe or microscope


Loupe is better when you are sharpening something not sraight. Like razor with smiling line of the edge.
So microscope isn't easy to use in this case, because you need to...

Or cheap chinese mini-microscope:

https://farm1.staticflickr.com/939/43700041401_56745178f1_z.jpg

https://farm1.staticflickr.com/933/43700041481_4a82cc6151_z.jpg...

If you want something inexpensive:
chinese USB isn't good variant, imho.


https://farm2.staticflickr.com/1818/44139848151_b783e7167e_z.jpg...

My friend use Samsung NX + various lenses
https://www.flickr.com/photos/oldtor/
And that is another level :)
https://farm2.staticflickr.com/1842/43512697775_fd8e0d68de_z.jpg
...

My old set: Olympus C-7070 + Peak 2008-50
like this:
(src: http://blogs.yahoo.co.jp/marimari0530/28208744.html)
https://farm1.staticflickr.com/856/41846691240_34d0370cc7_z.jpg

Result:...

So I use this
https://farm2.staticflickr.com/1873/30682711698_cc4af81821_z.jpg
and don't want to think about new type of HAD (Photographic..PAD? mh..not original any more)
Olympus E-3 + Zuiko...

Honestly - I don't have enought information on this theme.
Not rich enought to make another journey :D
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I know that DinoLite is nice (AM413T -- see video and pic review)
but it's...

:)
and i think MAD is the best name for this, because prices aren't good
(see Swiss Axe Triplet Hawk link -- i wish to unseen this pokemon -- better to collect eschers).
...
Wait a minute..SAD?...

About chinese triplets
Chinese loupe named "triplet"(left) and normal triplet(right)
https://farm1.staticflickr.com/938/28835838667_9ab6d513df_z.jpg...

yes. But I haven't met any good variants with PMMA optic if we are talknig about microscopes.
Kenko, Carson - it's just acceptable level, not more.
Noname chinese and near that(Kingmax, Bresser,...

Kenko doesn't have coating. And it's not a glass optic - acrylyc lenses.
Actually, chinese CN Scope (review) has coated glass lenses but it's still dark a bit. Darker than Mikko 30x (glass, no...

Next to..:
Loupe or microscope,
you can't trust photo,
lead params,
loupe short review,
microscope short review.

Magnification


The next thing is magnification.
Bigger magnification is not always better.
Why?
Because:
brightness, fiels of view, вepth of field - all these things become worse.
Also it's...

There is no short result.
I'll try try, but it'll take time.

Gold hammer
If you want to select the only one parameter that will give you absolete result - there is no such a thing.

You can...

So I've spent a couple of months for this.
https://farm2.staticflickr.com/1775/43949336591_d94091ba59.jpg
Belomo, Schneider, Peak, Carton, Carson, Kenko, Panasonic...

Sorry, but I have no time...