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MP's v Zoom question.
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Not Sure
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May 6, 2014 - 2:40 am
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Hi again, another Newbie question.

Given the choice of 1.3MP x 20 zoom IP camera such as Product# CVIPTZ-EL1MPL20X

or

2MP x 12 zoom such as Product# IPPTZ-EL2MPL12X-Mini-O

 

Based on MP's and zoom only, what would be your choice for image quality when viewing the far distance at maximum Optical Zoom?, ie what ccombination would "reach further"

Also, does the increased pixel count of the 2MP camera help with further digital zooming?

Many Thanks

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Ryan
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May 6, 2014 - 9:58 am
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Hello and welcome to the forum. 

 

That is a tough question, because you are not comparing apples to apples.  You are trying to compare a 12 times zoom to a 20 times zoom.  The 20 times zoom will give you a greater distance any day of the week.  Even with the higher MP on the camera, your digital zoom will pixelate well before the optical zoom will give out on the given cameras.

 

Now if you are talking about our IPPTZ-EL2MPL20X vs. CVIPTZ-EL1MPL20X, you are starting to compare apples to apples.  Both of these cameras are producing HD video and have 20 times optical zoom.  Now the 2MP is going to produce a 1080P image where the 1MP camera is going to produce a 720P image.  The clarity will be similar, but the 2MP camera will give you greater digital zoom after the fact. 

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May 6, 2014 - 9:26 pm
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Thanks for your reply Ryan,

So what about say a 3MP x 20 zoom compared to a 2MP x 30 zoom. At full zoom, each, in my simplistic thinking will give the same pixel density on a subject ie 3x20 = 60, and 2x30 = 60.

This at first glance seems similar, but would there be a difference taking it further, and using digital zoom?

Does the higher 3MP help to "reach" further, or has that already been accounted for as they both give 60 whatnots?

Many thanks

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Brad Besner
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May 6, 2014 - 10:55 pm
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If you had the 2MP with 30X Zoomed in all the way then technically yes, they would offer similar detail. However, that would be an uncommon scenario. In my opinion a 3MP x 20 Zoom would offer greater detail in most scenarios. 

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May 8, 2014 - 9:41 am
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Thanks Brad.

I'm wanting to use the camera for fire spotting in the summer here and want to check the far hills, some 20 km away. I need to zoom in as far as possible.

 

Iv'e looked deeper into the situation and have formed a different conclusion. It boils down to pixel count together with H/V ratio of the formats.

The extra 1 MP of the 3MP is mostly taken up in changing the format from 16:9 to 4:3. (1920x1080 vs 2048x1536)

ie it is only 128 pixels wider, yet a full 456 pixels higher.

If we crop the top of the 3MP image to make the same format of 16:9 we get 2048x16/9= 1152

so 2048x1152 = 2.36 MP.

2.36x20zoom = 47.2

2x30 = 60

Therefore, I think I'm better off with the 2 MP at 30 x zoom, plus the format of my screen is 1920 x 1080, so visually I  see the full monty.

Many thanks

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