is there a way to tell if you received 2.8 or 4mm by looking at the camera/lens?

[dannieboiz]

For whatever reason, when comparing my 2.8mm dome to my 4mm 2532 they both appear to have the same wide angle view. Is there a way to tell what they are by looking at the lens?

 

[fenderman]

For whatever reason, when comparing my 2.8mm dome to my 4mm 2532 they both appear to have the same wide angle view. Is there a way to tell what they are by looking at the lens?

Is the 2.8mm a hikvision?
what resolution are you running each cam?

 

[dannieboiz]

both are hikvision, I run them both at 1080p

 

[fenderman]

have you mounted them side by side?

 

[dannieboiz]

That's how I compared them, didn't mount it but held one at a time at the same location.

 

[fenderman]

If the show the exact same view then they are both the same lens...you would need to do some measuring and calculations to determine which one it is..what do the labels say?

 

[Michelin Man]

The 2.8mm shows a pretty wide view whereas the 4mm shows a tighter view.

As fenderman says, have a look at the small white sticker on the unit, it has the focal length on there.

If they stickers still say they are 2.8 and 4mm I'll try and find a comparison between 2.8mm and 4mm. But it probably was a mislabeled unit.

EDIT: http://www.ipcamtalk.com/showthread.php/91-Lens-Comparisons-4mm-6mm-12mm

Second post

 

[MartyO]

put in corner of room facing out, if you can see both walls equally its 2.8

 

[Del Boy]

put in corner of room facing out, if you can see both walls equally its 2.8

^^ This

 

[dannieboiz]

had a chance to go over my camera and see that label both reads 2.8 one of the vendor sent me the wrong one. no biggie, I can use 2.8 so it works out. Thanks!

 

[bp2008]

It isn't necessarily good to let the vendor get away with shipping the wrong lens sizes. You wouldn't want them to get into the habit of shipping folks the wrong size on purpose.