[...]The Megapixel Lens Problem « Spot On Security[...]…

[...]The Megapixel Lens Problem « Spot On Security[...]…

Thank you for your answers.

I’m working with severals megapixel cameras (0.4MP – 1.2 MP – 2 MP and 1/3″ – 1/2″ – 2/3″) and lenses.
Actually with fixed focal lens, I have less problem.
But my focus quality issue appears essentially with Varifocal megapixel lenses.

It’s very difficult to find out a good megapixel lens company that propose varifocal lenses.

Raphael

Thanks for the clarification.

Doug.

Unfortunately, we can’t list model numbers on the lenses we use, because the vendor sells them only directly to camera manufacturers. So, they aren’t available on the open market.

You can use lenses for larger formats, but these are generally a lot more expensive, and bigger. Size is a problem in dome cameras. Fortunately, there are now better choices available today, than even a year ago.

first of all you should give an exact model of lens and camera – it would by very informative. Secondly: maybe you should try a lens designed for a bigger sensor (when you use 1/3” camera, use 2/3” lens – only central part of lens coverage will be used and thus quality should be better. Remember about focal length). But, as Doug said, there are no many good lenses for MP cameras in the market.

Regards.

There are a few good quality lenses, that provide clear focus in the corners as well as in the center of the lens, for megapixel cameras.

We had to hunt to find one, but we are quite happy with what we found. That’s why we ship the lens with our camera, to assure there is no quality lost in the lens.

We saw a lot of incredibly poor lenses. So, you have to pick carefully.

The good news is megapixel lens designs are getting better.

You spoke about the difference between the focus center quality and the side quality. Does exist any solution to this issue? Actually I’m working with a megapixel camera and a megapixel lens.According to the datasheet, the lens resolution is supposed to fit with the camera resolution and I have the same problem concerning the focus quality in the sides…

Thanks,

Raphael

As you said, the optical resolution is limited by the resolving power of the lens, and your way of stating it is more accurate. It’s a good thing to bring up, to help others who want to understand.

I believe what Ali was asking, when he used the term, resolution, was the digital pixel resolution output of the camera. I’ve heard this question come up before. It sounds as if you know camera design, so you realize the digital pixel resolution output isn’t changed by the lens, but this isn’t obvious to many people who don’t know how cameras are designed.

Most camera resolution specs only list the pixel resolution. The optical lens characteristics are only usually stated as 1/3″ optics or 1/2″ optics, and of course the focal length and F-stop.

The resolving power of the lenses, which define the optical resolution, are rarely described to the final users, and is not always easy to get even from the lens manufacturers. That’s part of the reason this can be confusing to camera users.

Thanks.

Doug.