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How to test/compare microsope lenses at best?

 
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macrochemistry



Joined: 05 Jan 2012
Posts: 36
Location: Kiel, Germany

PostPosted: Mon Jan 09, 2012 8:46 pm    Post subject: How to test/compare microsope lenses at best? Reply with quote

I've ordered 3 10x microscope lenses, one Zeiss Plan Achromat (25€, they are cheap here), one Nikon BD Plan DIC (150€) and one Nikon Finite Conjugate (80€).
They will arrive within the next ~5-10 days
I like to compare them and to resell the inferiour ones but I can't get a butterfly wing or something similar at the moment as it's winter here.

Do you know any artifical materials which can be used?
At best something which is also showing CAs and is planar, that no stacking is necessay.

I thought about using a plastic sponge or a blade sharpener as they have fine structures but I guess they are not good in showing CAs.

Any ideas?


Last edited by macrochemistry on Mon Jan 09, 2012 10:06 pm; edited 2 times in total
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 20082
Location: Richland, Washington State, USA

PostPosted: Mon Jan 09, 2012 8:56 pm    Post subject: Reply with quote

http://www.photomacrography.net/forum/viewtopic.php?p=57812#57812

It is glass with "smoke" from a freshly lit match.

--Rik
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macrochemistry



Joined: 05 Jan 2012
Posts: 36
Location: Kiel, Germany

PostPosted: Mon Jan 09, 2012 9:38 pm    Post subject: Reply with quote

Thanks, I knew the thread but didn't see the glass with the frehly lit match on first sight. It might be also a good start. But that also does not show much CAs and it's not as easy to see the differences as with a moth wing etc.

Last edited by macrochemistry on Mon Jan 09, 2012 10:07 pm; edited 2 times in total
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Peter De Smidt



Joined: 05 Jan 2012
Posts: 233

PostPosted: Mon Jan 09, 2012 9:54 pm    Post subject: Reply with quote

rjlittlefield wrote:
http://www.photomacrography.net/forum/viewtopic.php?p=57812#57812

It is glass with "smoke" from a freshly lit match.

--Rik


The smoked glass was a great idea!
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 20082
Location: Richland, Washington State, USA

PostPosted: Mon Jan 09, 2012 11:01 pm    Post subject: Reply with quote

macrochemistry wrote:
But that also does not show much CAs and it's not as easy to see the differences as with a moth wing etc.

Hhmm... The smoke crystals should be fine for lateral CA (consider the aus Jena corner, lower left HERE), so I guess you're thinking about longitudinal CA, the stuff that shows up on OOF edges?

In any case you might consider using the finest available silicon carbide sandpaper:
http://www.photomacrography.net/forum/viewtopic.php?p=57833#57833
http://www.photomacrography.net/forum/viewtopic.php?p=58056#58056

Some laser printers will also put out sufficiently small toner dots to be useful:
http://www.photomacrography.net/forum/viewtopic.php?p=74873#74873

The diamond sharpener I recently tested has lots of fine detail with opportunity for CA:
http://www.photomacrography.net/forum/viewtopic.php?t=15581

Other suggestions:
- dried hairy leaves
- hair fragments from an electric razor
- dust debris from a vacuum cleaner

And maybe it's a silly suggestion, but check all your light fixtures. It's not uncommon for little scaled corpses to sit there for months.

--Rik
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Chris S.
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Joined: 05 Apr 2009
Posts: 3324
Location: Ohio, USA

PostPosted: Mon Jan 09, 2012 11:16 pm    Post subject: Reply with quote

Also, there are quite a few online vendors selling dried insect specimens (preferably farm raised, to avoid depleting natural ecosystems). I've used this one a couple of times, and been pleased: http://www.butterfliesandthings.com/BNT_aboutus.asp . But you can probably find a similar vendor closer to home.
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ChrisR
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Joined: 14 Mar 2009
Posts: 8396
Location: Near London, UK

PostPosted: Tue Jan 10, 2012 4:13 pm    Post subject: Reply with quote

Perhaps a Stage Micrometer.
If you can find one with 2mm at 0.01mm markings you would nearly cover the whole frame width.
High contrast (they're usually for transmitted light) with sharp edges, flat).
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BugEZ



Joined: 26 Mar 2011
Posts: 787
Location: Loves Park Illinois

PostPosted: Tue Jan 10, 2012 5:11 pm    Post subject: Off the grid... Reply with quote

I have never found a shortage of fruit flies at the local grocery that specializes in produce. Best place to look is near the pineapples. In fact, the fruit flies usually can help select the ripest one. ( Very Happy ) The only trick is to catch them without arousing suspicion with the other patrons or clerks.

Fruit fly eyes at 10X may provide a good grid pattern.

Keith
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