Polarizing Filter

[FlipNJ]

Anybody ever use a polarizing filter on their camera? My PTZ is very dialed in except for certain times of the day in where when a vehicle is parked in the FOV, the bright reflection off of their windshield steals the show and tracking stops there. May try anyway.

 

[42er]

Hello FlipNJ,

I did test Pol filter an my SD59430U-HNI... but dont find the sample pictures. Sry.

I glue on all my SD59430U-HNI an UV filter (same, what is used für DSLR) some mm bigger, as the lense, over the lens, and so I have on all cameras (because of the thread on the UV filter), the possiblility to use all kind of DSLR filters. Also Pol filters.

What I can remember was, that the car windows (that was the reason for me (like for you)) were visible, BUT, like on DSLR, the Pol filter takes you brightness away (like a sunglass), and because my SD59430U-HNI are none starlight cameras, I prefer a better picture in the night, than having clear and visible Car windows.

Hope I can give you some information to decide... give it a try, and you will see my findings.

 

[FlipNJ]

Hello FlipNJ,

I did test Pol filter an my SD59430U-HNI... but dont find the sample pictures. Sry.

I glue on all my SD59430U-HNI an UV filter (same, what is used für DSLR) some mm bigger, as the lense, over the lens, and so I have on all cameras (because of the thread on the UV filter), the possiblility to use all kind of DSLR filters. Also Pol filters.

What I can remember was, that the car windows (that was the reason for me (like for you)) were visible, BUT, like on DSLR, the Pol filter takes you brightness away (like a sunglass), and because my SD59430U-HNI are none starlight cameras, I prefer a better picture in the night, than having clear and visible Car windows.

Hope I can give you some information to decide... give it a try, and you will see my findings.

Thanks for your input. I have a couple 55 mm polarizing lenses that are extremely lightweight. I will try one and see how it works.

 

[mech]

I have a linear polarizing filter on one camera. It cuts the light down substantially, but it does what it is there for in my case: punch through windshield glare to ID occupants of stolens and other crime-related vehicles.

 

[tech101]

linear polarizing filter on one camera

Looks good, What cam model & Filter ? Any pic of the install ?

 

[mech]

It's a 2MP Bosch DINION IP dynamic 7000 HD that I had left over, with a Tamron varifocal lens at 50mm (targets are about 140ft out). The polarizing filter is stuck into that white thing, I can't remember what it is exactly, and that is friction-fit over the end of the Tamron lens. Its friends here are a Bosch 8000 Ultra 12MP, and Bosch 8000 Starlight 5MP, one of which is doing the LPR work. They look out through a 3/16"-thick / 5mm sheet of polycarbonate, which doesn't have as good of optical performance as the glass it replaced, but I thought it would be a worthwhile tradeoff considering the value of the cams and lenses.