Polarizer Goes Where?

OB1

OB1

Active member
NOTE: This is not a "how to" question (I can engineer that part) this is a "can" it go there question - Can a 4" circular polarizer be placed in front of the anamorphic adapter or must it be between the panasonic lens and the adapter? When I say "can" it be placed front of the anamorphic, I mean "technically" speaking will it function as it is designed to do with respect to the proper light correction, etc. in this location?

Obviously I'm aiming for a low-budget retrofit here, but my mechanical skills are greatly trumped by my lack of the technical side of this issue.

thanks all
 
I was unable to get any sort of filter to fit on the back of the anamorphic. The back of the anamorphic would conflict with the glass of the filter.

You'd need something like an empty spacer ring, in order to actually be able to physically mount a 72mm filter on the back of the anamorphic.

Then, you'll have to determine whether the change in distance affects the focus capabilities... I don't know for sure whether the anamorphic needs to be a particular distance from the front element of the camera lens or not. It may, or maybe not, don't know because until someone engineers the spacer rings.

A better solution would probably be to shave the lens hood off the front of the anamorphic (the way Chrosziel does) and then just use a 4x4 in front of it.
 
It can be put in all parts of the optical path. Polarizers need to be rotated though so better keep it in frort of the anamorphic adapter which is supposed to stay at a fixed rotation angle.
 
Barry:

I'm talking about retro-fitting to the FRONT of the anamorphic adapter. I've got a design idea for this but what I'm concerned about is the way on the Chroziel model, the polarizers/filters are between the anamorphic and the DVX stock lens - that maybe there's some "technical" reason why the pol won't work as well out front - mounted to the front of the anamorphic.
 
Oh -- DUH! I'm such a dope, I totally misread the question. Sorry. People have asked if they can put a filter between the anamorphic and the camera, and I guess I went off of that instead of off the question you actually asked! I got it backwards. Sorry!

Yes, it would be preferable for the filter to go in front of the lens, you wouldn't want it to go between them even if you were able to get one there. You want it in front of the optical path.
 
Barry_Green said:
A better solution would probably be to shave the lens hood off the front of the anamorphic (the way Chrosziel does) and then just use a 4x4 in front of it.
Click to expand...

Barry, do you know if the distance between the front glass of the anamorphic and the back of the polarizer matters? When you say shave the lens hood off the front (of anamorphic) is this to minimize the space between the two pieces of glass?

Don't mean to beg the question but this distance variable shouldn't change the effectivess of the polarizer right? (I need to have gone to some advanced physics course for this one!)
 
No, the distance between them won't have any effect on the polarizer's effectiveness. So you probably don't have to shave the lens hood off (although Chrosziel requires that if you're going to use their 4x4 mattebox).

But, since the DVX is already quite wide-angle, and the anamorphic is effectively a wide-angle adapter (in addition to changing the image shape), what will likely happen is that the depth of field will be *so deep* that you'll see every fleck of dust on the filters. That's why you want the filters as close as you can get them, so you don't go seeing the surface of them in focus in your shot.

Obviously you can experiment with just using the filter in front of the anamorphic, and it should work... just be aware that with filters you may see the surface of the filter in focus, which wouldn't be much of an issue for a polarizer or ND, but would be an issue for something like a pro-mist or softnet. And you may also see dust particles in focus too...

(love the razorback avatar, btw!)
 
Barry, O.k. great advice, I appreciate the warning about the dust. Maybe, as you say with the polarizer this will be less of a concern. I WILL experiement with this week and keep you posted. Thanks very much.

(by the way, the "razorback" is actually one of our rescued pot-bellied pigs. They're all hillarious, but this little guy's probably the funniest - he's 2 years old and never grew over about a foot or so tall. I think he's fairly phtogenic myself - especially when running straight for the camera! [name's "Corn Cobb"] )
 
Barry et al.,

Please see this polarizer:

http://www.evsonline.com/merchant2/merchant.mvc?Screen=PROD&Product_Code=DSRPOL44

I know with a little hand machining on the top edge of the anamorphic sun shade area (which itself is 13 mm in depth), I can create a receiving slot for this product to drop in. This would place the glass of the polarizer just a few millimeters in front of the front glass of the anamorphic lens.

I know this is a linear polarizer but am I correct that it is not measurably different on the DVX from a circular?

Does anyone have this polarizer? What of it's quality?

Feedback on this idea appreciated. . .
 
Schneider is one of the elite filter manufacturers; while I haven't used that product, I'd certainly think it was a very high-quality product. If you could wedge that into the front of the adapter, you might have a viable low-cost solution there.
 
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