Apologies if this is pretty obvious but I haven’t had any luck after looking around. On the Dahua web interface, how do you confirm what the zoom level is set to, as it relates to focal length? Say I wanted to test what 6mm focal length looks like, how do I set the camera to that specifically? The Zoom slider shows numbers from 0 (Zoom in) to 2275 (Zoom Out). However, it doesn't state what the equivalent lens focal length is within 2.7-12mm range.
Zoom level/focal length on T5442T-ZE
- Thread starter tytan
- Start date
sebastiantombs
Known around here
First you need to hover the mouse pointer over the zoom button on the bar and note the number you are set at. You also need the numbers from max and minum zoom, so note all three. Have a look in the Wiki, in the blue bar at the top of the page, and there's a calculator in there which will give you a fairly accurate calculation of mm.
Ok, I got it. THANKS!! @sebastiantombs Glad I wasn't losing my marbles.
In case you can't find it, here is a link to the calculator:
ipcamtalk.com
Realize that there may be some ambiguity with the value that you get. If you are going to use that number to base purchasing a fixed lens cam, depending on the make, model, MP and sensor size, and the type of lens used, you may not be able to get a good translation of FOV/focal length. See this thread:
ipcamtalk.com
Focal Length Calculator
Calculate the focal point of a camera to help determine the best size lens to order. Save & view your results later.
Realize that there may be some ambiguity with the value that you get. If you are going to use that number to base purchasing a fixed lens cam, depending on the make, model, MP and sensor size, and the type of lens used, you may not be able to get a good translation of FOV/focal length. See this thread:
Comparison of a Fixed Lens and a Varifocal Lens Camera's FOV
I was testing out a new Dahua T5442T-ZE 2.7-12mm Varifocal camera (from @EMPIRETECANDY ) and was going to compare it's performance to the Dahua HDW5231R-ZE and the HDW5431R-ZE cameras, which are 2.7-13.5mm varifocals, along with the T5442TM-AS fixed lens at 6mm camera. The HDW5431R-ZE has been...
Wow @samplenhold. That was SUPER helpful & spared me much future bewilderment. I literally just unboxed a 5442T-ZE and a 5442T and was starting to compare to gauge my next fixed lens models. I appreciate your info. It now seems this won't be an exact science but hopefully close enough.Realize that there may be some ambiguity with the value that you get. If you are going to use that number to base purchasing a fixed lens cam, depending on the make, model, MP and sensor size, and the type of lens used, you may not be able to get a good translation of FOV/focal length. See this thread:
Comparison of a Fixed Lens and a Varifocal Lens Camera's FOV
I was testing out a new Dahua T5442T-ZE 2.7-12mm Varifocal camera (from @EMPIRETECANDY ) and was going to compare it's performance to the Dahua HDW5231R-ZE and the HDW5431R-ZE cameras, which are 2.7-13.5mm varifocals, along with the T5442TM-AS fixed lens at 6mm camera. The HDW5431R-ZE has been...