Looking for quarterwave plates

jcb · Post by **jcb** » Sun Nov 18, 2012 2:29 am

Thanks to the forum I found polarization filters (Edmund Techspec) that can be mounted in my Zeiss Axiolab between lens and head (20mm clear aperture and 25.0mm - not 1 inch - maximum diameter due to the filter drawer dimensions). I expected to find quarter wave and other retarders in the same diameters from the same source or from Thorlabs but without any luck so far.
Any ideas of a source ?
Thanks !

Perl · Post by **Perl** » Sun Nov 18, 2012 6:26 am

Hi !

What shall the Dimension of the plate be to fit ?

Regards
Pär

jcb · Post by **jcb** » Sun Nov 18, 2012 6:40 am

The filter drawer has a section of 25x6 mm. Light beam below the filters is 17mm diameter. Eyepieces are 10x20.
I am looking for a minimum free optical opening of 19 to 2Omm, a maximum outside diameter -all included- not more than 25mm and total thickness -all included- less than 6mm.

Perl · Post by **Perl** » Sun Nov 18, 2012 6:54 am

I might have an Lomo Quarter Plate that fit¨

How much do you offer for it ?

Regards
Pär

Perl · Post by **Perl** » Sun Nov 18, 2012 7:08 am

Hi !

Just Looked Over My Plates al are 20 mm X 6 mm

Wonder if your is not have to be that size - thats
standard DIN Size ?

Regards
Pär

g4lab · Post by **g4lab** » Sun Nov 18, 2012 12:31 pm

https://www.micro-shop.zeiss.com/?s=767 ... 0700750000

https://www.micro-shop.zeiss.com/?s=767 ... 0700500000

Full wave (lambda) is $354 and Quarter Wave is $466

http://www.lomoplc.com/OEMFrames.html

LOMO sells their quarter wave plate here in the USA for $135 and their fullwave for $195

http://www.polarization.com/polarshop/p ... ucts_id=41

http://www.polarization.com/shop/catalog/index.html

http://www.apioptics.com/quarter-wave-r ... -spec.html

http://www.mecanusa.com/polarizer/lambda_ir.htm

http://www.nhm.ac.uk/hosted_sites/queke ... rised.html

Such plates are easy to make out of mica and selenite as well as from birefringent plastic sheeting.

Charles Krebs · Post by **Charles Krebs** » Sun Nov 18, 2012 2:26 pm

If you have a "standard" slider slot you might want to take a look at Motic accessories

http://microscope-depot.com/misc.asp?mpn=S-09706

Perl · Post by **Perl** » Mon Nov 19, 2012 1:29 am

Hi !

Have a Zeiss 1/4 Lambda 6 mm x 20 mm i can sell you
mail me of line if your intressted

Regards
Pär

jcb · Post by **jcb** » Mon Nov 19, 2012 12:15 pm

Thanks for all the suggestions !
It seems that the DIN (Lomo, some Zeiss) sliders have a kind of open crescent at the end that makes them too long for the (older, not A1) Axiolab filter drawers. The Axiolab has little room between the optical path opening and the edge of the slider opposite to the handle. (The "hole" is very near the "far edge" of the slider for mechanical reasons). The best solution would seem to be taking the filter out and mounting it in a different holder.
I am wondering about films. Can one use them between the lens and head ? Do they have to be laminated or sandwiched with some glass support ?