eveares 0 Posted November 16, 2016 I have a Foscam FI9853EP PoE IP cam what according to a data sheet I have found online, has a 1/4" CMOS Sensor. The camera is a 720P camera and has a advertised field of view of 70°. As I needed a wider angle lens, so I bought by self a "115° Degree Fixed Iris Wide Angle Lens" online what has the same focal length (2.8mm) as the stock 70° lens, although it is a 1/3" format lens and not a 1/4" lens like the sensor on my camera. In summary: Camera: 1MP 6.4mm (1/4") CMOS Sensor. Old Lens: 70°, f:2.8mm, F/1.2, Presumed 1/4" format matching sensor. New Lens: 115°, f:2.8mm, F/2.0, 1/3" Format. If I am correct, a 1/4" sensor has 0.5739 of the area of a 1/3" sensor. Will the field of view be 65° (115° x 0.5739), or will it be 86° (115 ÷ 1.33) due to 1/4 * 1.33 = 1/3 mathematically. Regards: Elliott. Share this post Link to post Share on other sites
emptech 0 Posted January 31, 2017 search the web for the company, Theia Technologies, they have a free on-line lens calculator, they also have smart phone apps too. They are trying to sell their lenses, but you can choose one of their lenses similar to what you are testing and see it's angle of coverage, etc. https://www.theiatech.com/calculator/ Hope this helps - Share this post Link to post Share on other sites
