Wireless IP Camera thread

[Fuzzywuz]

Actually for 3X optical zoom when we try to equate to spotting scopes and binoculars
magnification is quite a big number as these equipments actually defines view area magnification. 3X optical zoom is comparable to 9X on bino. Hope this helps.

 

[geckoSG]

Great input from Fuzzywuz. We r back on discussion.

 

[Dr_ARCHer]

Sorry. Been travelling so didn't have time to post, or play with the IP cameras I bought.

On the issue of zoom, fixed lens have zero zoom, or more specifically, their zoom is 1x, regardless of foical length. Thus a 24mm wide lens and a 300mm lens both have only 1x zoom. However, the 24mm lens shows negative magnification relative to thehuman eye, while a 300mm lens show positive magnification relative to the human eye.

To calculate the number of times of zoom, divide the longest focal length with the shortest focal length. A SLR lenses of 35-105mm has a zoom factor of 3, as does a 50-150mm lens. However the latter would show a more magnified image compared to the former.

So a 3x zoom doesn't mean the image will be 3 times the size. It just means that at the maximum zoom, it is 3 times the size of the minimum zoom, which could be negatively magnified.

Note that this explanation is from the world of photography. Yes, I do have some rather nice Canon lenses

 

[wacko]

Actually for 3X optical zoom when we try to equate to spotting scopes and binoculars
magnification is quite a big number as these equipments actually defines view area magnification. 3X optical zoom is comparable to 9X on bino. Hope this helps.

I have to disagree with this post, it is simply not factual. 9X on a pair of binoculars means everything through that binoculars will look 9 times as large as they would through your naked eye. 3X optical zoom is different, it just means (as Dr_ARCHer has described) the most zoomed in object size is 3 times the size of it when the most zoomed out. even then I wouldn't go on to compare a 3X zoom lens to a 3X powered binoculars, because the baseline of the magnification between the 2 are completely different.

Hence if T7833WIP is indeed with a focal length of 4mm to 9mm, it is more accurately described as having a 2.25X optical zoom.

 

[Fuzzywuz]

I have to disagree with this post, it is simply not factual. 9X on a pair of binoculars means everything through that binoculars will look 9 times as large as they would through your naked eye. 3X optical zoom is different, it just means (as Dr_ARCHer has described) the most zoomed in object size is 3 times the size of it when the most zoomed out. even then I wouldn't go on to compare a 3X zoom lens to a 3X powered binoculars, because the baseline of the magnification between the 2 are completely different.

Hence if T7833WIP is indeed with a focal length of 4mm to 9mm, it is more accurately described as having a 2.25X optical zoom.

. Actually more accurately I should add the viewing monitor or LCD in that statement. If looking at a distant object throught the bino and on my LCD screen is similar in size with my zoom at minimum, and bino 9X is coparable to 3X optical zoom.

 

[Hardcor?]

EasyN just told me that they may import the H3-BEN7. Look at the size of that beauty. I can watch my neighbours cable TV for free!! LOLzzz!!

 

[Dr_ARCHer]

I think we have to differentiate between zoom and magnification. Magnification is always relative to the human eye e.g. microscope has 200x magnification. Zoom on the other hand is relative to the shortest focal length. For a full-frame DLSR, the normal magnification is roughly given by a 50mm lens, so a 50-150mm lens has up to 3x magnification as well as 3x zoom. On the other hand, a 35-105 has 3x the zoom, but the magnification is roughly about 2x. Of course there is nothing to stop you from saying that at 105mm, the magnification is 3x that of a image at 35mm, but actually, what you are referring to is that at 105mm, the zoom is 3x.

 

[Fuzzywuz]

I'm not sure how you define magnification for zoom lens. For a bino with 9 X magnification, it means it will produce an image 9 X bigger compared to when seen with a naked eye. But I've compared the camera with 5-15mm lens with a camera with lens of 3.6mm, the picture is indeed 15/3.6 times longer as well as wider. If the size of the image seen by the naked eye is equivalent to the size of the image seen on the display apparatus using the IP camera with 5mm lens, then the equivalent magnification for a bino will be (15/5)squared or 9 X magnification if the IP camera lens extends to 15mm.

 

[wacko]

I'm not sure how you define magnification for zoom lens. For a bino with 9 X magnification, it means it will produce an image 9 X bigger compared to when seen with a naked eye. But I've compared the camera with 5-15mm lens with a camera with lens of 3.6mm, the picture is indeed 15/3.6 times longer as well as wider. If the size of the image seen by the naked eye is equivalent to the size of the image seen on the display apparatus using the IP camera with 5mm lens, then the equivalent magnification for a bino will be (15/5)squared or 9 X magnification if the IP camera lens extends to 15mm.

again, incorrect. 9X magnification is not a factor of area, it's a factor of any 1 dimensional measurement of the object.

 

[Fuzzywuz]

again, incorrect. 9X magnification is not a factor of area, it's a factor of any 1 dimensional measurement of the object.

I beg to differ. For spotting scopes and binoculars it is by viewable area. 9 X means 3 X in 1 dimension.

 

[wacko]

I beg to differ. For spotting scopes and binoculars it is by viewable area. 9 X means 3 X in 1 dimension.

sigh, not sure why do you keep insisting on being wrong. fine, let me Google it for you.

BINOCULAR BASICS

"7x" means the binocular makes whatever you look at appear seven times closer than it does to the unaided human eye.

Binoculars: How to Choose

A magnification power of 7 means that an object will appear 7 times closer than it would to your unassisted eye. For example, if you view a deer that stands 200 yards away from you through 7x binoculars, it will appear as though it were 28.6 yards away (200 divided by 7).

Describing binoculars

For example a bridge 1000 metres away would appear to be 100 metres away when viewed with 10x binoculars.

and if you apply simple math, and object's height (1-dimension) is twice as high if comparing half distance versus full distance. hence 2X magnification means 2X the height, or 4X the area.

 

[Fuzzywuz]

sigh, not sure why do you keep insisting on being wrong. fine, let me Google it for you.

BINOCULAR BASICS


Binoculars: How to Choose


Describing binoculars


and if you apply simple math, and object's height (1-dimension) is twice as high if comparing half distance versus full distance. hence 2X magnification means 2X the height, or 4X the area.

The information you googled does not concur with my findings. Check out the binoculars or spotting scopes in funan and you will know. 10 X means 10 times nearer? 100 X increase in area? Practical experience tell me it's not true. What is true is 10 X area magnification for 10 x 50mm bino.

 

[wacko]

The information you googled does not concur with my findings. Check out the binoculars or spotting scopes in funan and you will know. 10 X means 10 times nearer? 100 X increase in area? Practical experience tell me it's not true. What is true is 10 X area magnification for 10 x 50mm bino.

Nikon | Sport Optics | Magnification (Binocular)

if you want to continue to be delusional, and think that even Nikon is wrong too, go ahead.

 

[Fuzzywuz]

Nikon | Sport Optics | Magnification (Binocular)

if you want to continue to be delusional, and think that even Nikon is wrong too, go ahead.

Telescope Magnification - YouTube

There may be some truth in this video. To find out, please invest in a pair of binoculars. Mine is a Bushnell spotting scope. I know what you mean, I can read all the post by Google search also.

 

[wacko]

Telescope Magnification - YouTube

There may be some truth in this video. To find out, please invest in a pair of binoculars. Mine is a Bushnell spotting scope. I know what you mean, I can read all the post by Google search also.

it's hard facts and formulas that you are arguing against, and quoting another incorrect source doesn't make your statement anything more than misinformation. I don't have to invest in a pair of binoculars to prove anything, just like how I don't have to own a calculator to prove 1+1=2.

 

[Fuzzywuz]

What the numbers mean
Watch this video with full screen and calculate the height of this women at 1x and 8x magnification and you know what I mean.

 

[Fuzzywuz]

it's hard facts and formulas that you are arguing against, and quoting another incorrect source doesn't make your statement anything more than misinformation. I don't have to invest in a pair of binoculars to prove anything, just like how I don't have to own a calculator to prove 1+1=2.

You are talking about 2 sets of problem here. I'm sure you need a calculator in University but not in Primary school.

 

[Fuzzywuz]

it's hard facts and formulas that you are arguing against, and quoting another incorrect source doesn't make your statement anything more than misinformation. I don't have to invest in a pair of binoculars to prove anything, just like how I don't have to own a calculator to prove 1+1=2.

It just proves how inaccurate information on the internet can be. You need to do your own experiment to verify this.

 

[Fuzzywuz]

It just proves how inaccurate information on the internet can be. You need to do your own experiment to verify this.

Sometimes being too accurate and truthful does not bring in the sales. Gecko should know.

 

[Fuzzywuz]

Di Zi Gui????????????? English & Vernacular Chinese Translation, ?? Simplified Script, Tsoidug Website ????

And for sake of forum readers, please take a break with this which I spent some time reading while googling for stuffs about magnification. LOLzzzzzz!!!