Teklock 0 Posted December 11, 2013 Can someone point me where I can source a couple of lens for a 5MP Dahua HF3500? It seems this camera has a 1/2" sensor and most of the lens i'm finding are for 1/3". What will I see if I put a 1/3" lens on a 1/2" camera? Share this post Link to post Share on other sites
MaxIcon 0 Posted December 11, 2013 A 1/3" lens may cause dark corners on your image, though many have a large enough image circle to cover a 1/2.5" sensor (from the website specs). A 2/3" lens will work, too, but will give the field of view of a longer lens. Lenses for bigger sensors tend to give higher quality images, as image quality usually drops near the edge of the lens. 1/2" lenses are less common than 1/3", but still pretty available. They tend to cost more. It looks like the camera supports auto-iris and day/night switching, so you'll likely want a lens that has auto-iris and is IR corrected. You'll also want one that's MP rated to get best use of your 5MP. That camera supports CS and C mount, but to use a C mount, you'll need a C to CS adapter. Fujinon, Computar, and CBC are all decent brands, and there are others as well. Take a look at this link for a big assorment of 1/2" lenses, then google the ones you're interested in to see if the prices are good: http://www.bhphotovideo.com/c/search?atclk=Format_1%2f2%22&ci=3659&N=4045021054+4291756354 Share this post Link to post Share on other sites
Teklock 0 Posted December 12, 2013 A 1/3" lens may cause dark corners on your image, though many have a large enough image circle to cover a 1/2.5" sensor (from the website specs). A 2/3" lens will work, too, but will give the field of view of a longer lens. Lenses for bigger sensors tend to give higher quality images, as image quality usually drops near the edge of the lens. 1/2" lenses are less common than 1/3", but still pretty available. They tend to cost more. It looks like the camera supports auto-iris and day/night switching, so you'll likely want a lens that has auto-iris and is IR corrected. You'll also want one that's MP rated to get best use of your 5MP. That camera supports CS and C mount, but to use a C mount, you'll need a C to CS adapter. Fujinon, Computar, and CBC are all decent brands, and there are others as well. Take a look at this link for a big assorment of 1/2" lenses, then google the ones you're interested in to see if the prices are good: http://www.bhphotovideo.com/c/search?atclk=Format_1%2f2%22&ci=3659&N=4045021054+4291756354 Thank you so much! This is the one i went ahead and ordered. http://store.immediasys.com/3-3-11mm-1-2-5-f1-4-cs-mount-ir-corrected-dc-auto-iris-mpl33-11ai Share this post Link to post Share on other sites
myiicu 0 Posted December 12, 2013 In general with cctv, you get what you pay for. In general with cctv lens, you definitely get what you pay for. That Arecont lens will be a little soft. If you want a sharper image for your 5mp camera, you will have to spend more. Share this post Link to post Share on other sites
MaxIcon 0 Posted December 14, 2013 This is true. However, I've got several Arecont 1/2" manual iris MP lenses, and while they're not as sharp as their $300+ brothers, they're decent performers at reasonable prices. Based on my experience with the manual iris lenses, you're unlikely to find a better performing MPIR lens for anywhere near that price. They have an image gallery for it here, including some images from 10MP cams. You can't always trust vendor info to be accurate, but it's something. http://www.arecontvision.com/resources.php?pid=375 Share this post Link to post Share on other sites
