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empedokles

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Posts posted by empedokles

  1. Posted

    If you're not sure what focal length you'll need, you should go with vari-focal, as swapping M12 lenses is a bit of a minefield.

     

    It will be much more on the tele-side of things for birdwatching.

     

    How about domes?

    http://www.grandstream.com/index.php/products/ip-video-surveillance/gxv3662

     

    Do I also have to set focal lenghts manually with domes? Or is focal lenght and position selectable over my PC?

  2. Posted

    I hope to have a review in a week or so. I started testing the hfw4300s 2 weeks ago but for some reason it died and just got the replacement a few days ago.

     

    Did you get it over aliexpress? There is another model hfw4300e. What's the difference?

     

    The price is really tempting:

    http://www.aliexpress.com/item/DAHUA-IPC-HFW4300S-IP-Cameras-Box-Camera-CMOS-3MP-POE-IP66-IR-30M-HD-1080P-ONVIF/1536761860.html

     

    Can you confirm on the 20fps for 3mpx?

  6. Posted

    The 3300C, and the 2100N as well, have problems with really soft compression in the shadows if you've got a mix of well-lit and shadow images. Hard to say if they'll ever fix that with firmware, since they never say what's in the firmware updates, and firmware can be hard to find.

     

    Vari-focal lenses are generally not as good quality at the extremes as fixed-focus lenses, but it totally depends on the lens. You can't adjust these over the network - they're strictly manual. In addition, some Dahuas have issues with the focus shifting when they're in the sun for a while. One of mine does this, and another user was posting with similar problems.

     

    I've given up on Dahuas, personally, but other people still like them.

     

    Well, I want to film black crows (they are kind of shadowy ). I must say that I'm after a natural look.

     

    I don't like the mount on the Dahua either (the cable seems only to go trough the mount). That is more flexible with the Grandstream (probably?) and ACTi. The ACTi could even be mounted on a Tripod. 20fps at 3mpx of the newset Dahuas would have been a benefit, but it seems Dahua is getting off this list. Maybe I put Hikvision in the game instead.

     

    I'm not sure if I can get lucky with a fixed lens (It would be a bit of speculation as I don't have any experience with network cameras and their focal lengths). Hard to say. On the other hand I don't want to distort the crows with wide angles.

  9. Posted

    Hello. I want to film ravens while they are collecting food (I also want to build an arduino collecting mechanism for them later). It would be great if I could generate hi-res fotos from them. Unfortunately 3mpx cameras only will record with 15fps. I also intend to do some basic computer vision with SimpleCV. My Computer is about 30 meters away.

     

    Which camera would you recommend me? On Amazon I saw the Grandstream GXV3672_FHD [2048x1536 (15fps); 1920x1080 (30fps)]. It comes with a fixed 8mm lens. I don't want to spend much more money on it then around the 220 bucks it costs. Fixed means I'm set for a specific position. Well I basically could mount it on a board. But is the image quality on a fixed lens much better than on a vari?

     

    What are other camera recommendations?

     

    The first image would be a wall-mount possibility (about 5-6 meters away from the food place):

    236772_1.jpg

    The second image is what I would get:

    236772_2.jpg

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