robert 0 Posted November 22, 2008 The problem is - I can`t turn by hand lets say 1/10 of mm to get perfect sharpness. How do you do that? Any tools? Share this post Link to post Share on other sites
rapid 0 Posted November 23, 2008 what is the focal length of the lens? what format is the lens and camera? Share this post Link to post Share on other sites
robert 0 Posted November 23, 2008 what is the focal length of the lens?what format is the lens and camera? Well, it doesn`t make any difference, does it? Its just that you cannot turn ring for example by 1/10 of mm to get it in focus. But its 4-8mm, 2/3 lense for megapixel camera Arecont Vision with 1/2 sensor. Share this post Link to post Share on other sites
rapid 0 Posted November 23, 2008 the black screw at the back of the lens....twist counter clockwise slightly to loosen the screw....should be able to rotate rear ring now Share this post Link to post Share on other sites
robert 0 Posted November 23, 2008 (edited) the black screw at the back of the lens....twist counter clockwise slightly to loosen the screw....should be able to rotate rear ring now I know that and I can rotate rings. But to get perfect focus you need to turn rings by some 0.01mm 0 but how do you do that? I personally cannot. Edited November 23, 2008 by Guest Share this post Link to post Share on other sites
rapid 0 Posted November 23, 2008 Sounds like camera/lens back focus issue. Robert....Can you slightly unscrew the lens from the camera mount? Don't know this camera, but is there a brass lens mount ring between camera and lens? Share this post Link to post Share on other sites
robert 0 Posted November 23, 2008 Sounds like camera/lens back focus issue.Robert....Can you slightly unscrew the lens from the camera mount? Don't know this camera, but is there a brass lens mount ring between camera and lens? Yes I can. I tried with ring, without ring, but picture doesn`t seem to be 100% perfect sharp, a littlebit smooth. Its fine on one camera, but on other 2 not. Share this post Link to post Share on other sites
rapid 0 Posted November 23, 2008 do you have any 1/2 format lenses handy? the 2/3 may be giving you some distortion at the 4mm, although it should be fine....just a suggestion. Share this post Link to post Share on other sites
robert 0 Posted November 23, 2008 do you have any 1/2 format lenses handy?the 2/3 may be giving you some distortion at the 4mm, although it should be fine....just a suggestion. No, i dont have any other lense. I was probably very lucky to get in focus one of them. But should it be much more easy to get varifocal lense in focus? Share this post Link to post Share on other sites
ak357 0 Posted November 23, 2008 (edited) Sounds like camera/lens back focus issue.Robert....Can you slightly unscrew the lens from the camera mount? Don't know this camera, but is there a brass lens mount ring between camera and lens? Yes I can. I tried with ring, without ring, but picture doesn`t seem to be 100% perfect sharp, a littlebit smooth. Its fine on one camera, but on other 2 not. I can feel your pain just finish 5 -3100 DN install was using chinese 1/2 '' lenses in general I dont think i will be using Arecont anymore have a look pix was resized 1024x768 http://i305.photobucket.com/albums/nn217/ak357/1024x768.jpg as u can see far away is kinda blurry but i cant do any better customer like it so for now we decide to leave it Edited November 23, 2008 by Guest Share this post Link to post Share on other sites
robert 0 Posted November 23, 2008 Sounds like camera/lens back focus issue.Robert....Can you slightly unscrew the lens from the camera mount? Don't know this camera, but is there a brass lens mount ring between camera and lens? Yes I can. I tried with ring, without ring, but picture doesn`t seem to be 100% perfect sharp, a littlebit smooth. Its fine on one camera, but on other 2 not. I can feel your pain just finish 5 -3100 DN install was using chinese 1/2 '' lenses in general I dont think i will be using Arecont anymore have a look pix was resize 1024x768 http://i305.photobucket.com/albums/nn217/ak357/1024x768.jpg HUGE mistake - using anything else than Computar, Tamron, Fujinon Everthying else - rubbish, not talking about some kind of Chinese miracles But picture seems to be ok to me. What tools do you use to focus varifocal lenses? Share this post Link to post Share on other sites
ak357 0 Posted November 23, 2008 Sounds like camera/lens back focus issue.Robert....Can you slightly unscrew the lens from the camera mount? Don't know this camera, but is there a brass lens mount ring between camera and lens? Yes I can. I tried with ring, without ring, but picture doesn`t seem to be 100% perfect sharp, a littlebit smooth. Its fine on one camera, but on other 2 not. I can feel your pain just finish 5 -3100 DN install was using chinese 1/2 '' lenses in general I dont think i will be using Arecont anymore have a look pix was resize 1024x768 http://i305.photobucket.com/albums/nn217/ak357/1024x768.jpg HUGE mistake - using anything else than Computar, Tamron, Fujinon Everthying else - rubbish, not talking about some kind of Chinese miracles But picture seems to be ok to me. What tools do you use to focus varifocal lenses? I do have in stock all "famous" lenses cant see big difference I use my hands as "tools" dont have big problem to focus Share this post Link to post Share on other sites
rapid 0 Posted November 23, 2008 although the lense is rated for 4 mm, I've come across something similar where I had to sacrifice the focal length to say 4.2 mm, so that I had enough realestate to focus the lens. Share this post Link to post Share on other sites
robert 0 Posted November 23, 2008 Sounds like camera/lens back focus issue.Robert....Can you slightly unscrew the lens from the camera mount? Don't know this camera, but is there a brass lens mount ring between camera and lens? Yes I can. I tried with ring, without ring, but picture doesn`t seem to be 100% perfect sharp, a littlebit smooth. Its fine on one camera, but on other 2 not. I can feel your pain just finish 5 -3100 DN install was using chinese 1/2 '' lenses in general I dont think i will be using Arecont anymore have a look pix was resize 1024x768 http://i305.photobucket.com/albums/nn217/ak357/1024x768.jpg HUGE mistake - using anything else than Computar, Tamron, Fujinon Everthying else - rubbish, not talking about some kind of Chinese miracles But picture seems to be ok to me. What tools do you use to focus varifocal lenses? I do have in stock all "famous" lenses cant see big difference I use my hands as "tools" dont have big problem to focus But do you notice that varifocal lenses have less sharper images than fixed focal lenght lenses? Share this post Link to post Share on other sites
robert 0 Posted November 23, 2008 although the lense is rated for 4 mm, I've come across something similar where I had to sacrifice the focal length to say 4.2 mm, so that I had enough realestate to focus the lens. Arecont Vision 1/2 camera +Computar 4-8mm varifocal 2/3 lense. I dont remember wich end, but 4 or 8 mm - complete fog, so you dont really get full range 4-8. I think probably because of format difference. I have few mm less to play with. Share this post Link to post Share on other sites
ak357 0 Posted November 23, 2008 [ But do you notice that varifocal lenses have less sharper images than fixed focal lenght lenses? yes i kinda agree with u and impossble to get focus from zoom in to zoom out range Share this post Link to post Share on other sites
robert 0 Posted November 23, 2008 I even tried to use Arecont software, digital zoom and then focusing - but still no success on 2 cameras, I dont like it myself, so I wont leave it like that for a customer. Just one camera looks super sharp, great, I love it. Share this post Link to post Share on other sites
ak357 0 Posted November 23, 2008 I even tried to use Arecont software, digital zoom and then focusing - but still no success on 2 cameras, I dont like it myself, so I wont leave it like that for a customer. Just one camera looks super sharp, great, I love it. any pix samples ? What soft do u use ? Share this post Link to post Share on other sites
robert 0 Posted November 23, 2008 This is image from the camera i did get in focus and I do like it myself. I dont have those out in focus at the moment. http://img517.imageshack.us/img517/7559/kr1qk8.jpg Share this post Link to post Share on other sites
robert 0 Posted November 23, 2008 I even tried to use Arecont software, digital zoom and then focusing - but still no success on 2 cameras, I dont like it myself, so I wont leave it like that for a customer. Just one camera looks super sharp, great, I love it. any pix samples ? What soft do u use ? Luxriot - rocks. Based on Arecont SDK. Share this post Link to post Share on other sites
ak357 0 Posted November 23, 2008 quote] Luxriot - rocks. Based on Arecont SDK. Thx I use original Arecont or ExacqVision just for fun I can get u video clip done by soft which use true H.264 just incredible 10 frames per second for 20 sec at 1600x1200 only about 2.2 MB Share this post Link to post Share on other sites
robert 0 Posted November 23, 2008 Luxriot - rocks. Based on Arecont SDK. Thx I use original Arecont or ExacqVision I can get u video clip done by soft which use true H.264 just incredible 10 frames per second for 20 sec at 1600x1200 only about 2.2 MB woow, thats impressive Luxriot are going to release new version in next few weeks, H264 will be supported there. Please drop me that video to rbsarg AT gmail.com Share this post Link to post Share on other sites
robert 0 Posted November 23, 2008 I was looking at ExacqVision once, load of video on youtube. But it did seem a bit complicated to me. Whats your experience with it? Have you used Luxriot? Share this post Link to post Share on other sites
ak357 0 Posted November 23, 2008 I was looking at ExacqVision once, load of video on youtube.But it did seem a bit complicated to me. Whats your experience with it? Have you used Luxriot? Hmm i have opposite opinion Luxriot is kinda awkward and Exacq no problem but I did not play with Luxriot for long time I guess I should give them another try Share this post Link to post Share on other sites
robert 0 Posted November 23, 2008 Then I should look at it again. I cannot download any software from their website, its asking for username and password. Do you know where I can get some demo or trial? What about price - which one is cheaper? Share this post Link to post Share on other sites
