Wave plate

Saul · Post by **Saul** » Wed Dec 05, 2018 11:15 am

Anybody tried this wave plate ?

Pau · Post by **Pau** » Wed Dec 05, 2018 11:50 am

Be aware of the small 13mm shorter dimension. Just after reading your post I clicked the buy button...I'm trying to cancel the order

Saul · Post by **Saul** » Wed Dec 05, 2018 11:56 am

Pau wrote:Be aware of the small 13mm shorter dimension. Just after reading your post I clicked the buy button...I'm trying to cancel the order

Yes, I saw that .
If cut in half, it could be placed somewhere close to the back of the objective. Another question - how cut it in half nicely this thin thing ?

ChrisR · Post by **ChrisR** » Wed Dec 05, 2018 12:46 pm

Find a piece of sharp tungsten carbide. A corner on a new masonry drill is sharp enough. That'll scratch glass much more easily than a normal glass cutter. Then of course it snaps easily.

Saul · Post by **Saul** » Wed Dec 05, 2018 1:53 pm

ChrisR wrote:Find a piece of sharp tungsten carbide. A corner on a new masonry drill is sharp enough. That'll scratch glass much more easily than a normal glass cutter. Then of course it snaps easily.

Yeah, it is standard procedure with glass..normal thickness glass ...

Did you try with this thin stuff ?

ChrisR · Post by **ChrisR** » Wed Dec 05, 2018 5:07 pm

I don't know what "this stuff" is made of, but I've cut coverslips and slides easily. The point is you need a very sharp hard tool to scratch the glass with little pressure. Normal glass cutting tools need too much pressure to make the scratch.

If it's crystalline and you scratch it, & constrain the bend to the scratch, I wouldn't expect a problem.
?

Saul · Post by **Saul** » Wed Dec 05, 2018 5:09 pm

ChrisR wrote:I don't know what "this stuff" is made of, but I've cut coverslips and slides easily. The point is you need a very sharp hard tool to scratch the glass with little pressure. Normal glass cutting tools need too much pressure to make the scratch.

If it's crystalline and you scratch it, & constrain the bend to the scratch, I wouldn't expect a problem.
?

Thanks Chris, you calmed me down ! So I bought it, let's see what will happen

ChrisR · Post by **ChrisR** » Wed Dec 05, 2018 5:38 pm

I'm 4000 miles away, so I hope I'm safe

Smokedaddy · Post by **Smokedaddy** » Fri Dec 07, 2018 9:38 am

... probably wasting your time but why not use these?

https://www.edmundoptics.com/f/polymer- ... ilm/14827/

-JW:

Saul · Post by **Saul** » Fri Dec 07, 2018 9:53 am

Smokedaddy wrote:... probably wasting your time but why not use these?

https://www.edmundoptics.com/f/polymer- ... ilm/14827/

-JW:

James, not at all, thank you very much for the link !
Any idea how this film affects image quality if placed above the objective ?
For below I'm using this polarizing assembly (tried different celolphanes), for now I'm pretty happy with it

Smokedaddy · Post by **Smokedaddy** » Fri Dec 07, 2018 10:43 am

Saul wrote:
Smokedaddy wrote:... probably wasting your time but why not use these?

https://www.edmundoptics.com/f/polymer- ... ilm/14827/

-JW:
James, not at all, thank you very much for the link !
Any idea how this film affects image quality if placed above the objective ?
For below I'm using this polarizing assembly (tried different celolphanes), for now I'm pretty happy with it

Yes it will.

I use the retarder film on top of a quality polarizer, which I then place on top of my Optiphot field lens. Guess I didn't understand your application.

-JW:

Saul · Post by **Saul** » Fri Dec 07, 2018 11:41 am

Smokedaddy wrote:Yes it will.

OK, it means it is affecting image quality. Maybe glass based will work better (as a upper retarder) ?
My setup is (except I do not have upper retarder - cannot use cellophane):