bsa man Posted November 19, 2014 Report Share Posted November 19, 2014 whilst shooting for rats the other night using my yukon photon nv i was struggling because of the foggy conditions,my shooting partner uses a lamp and i noticed that i could see a little better when his lamp shone into my field of view.i turned off my illuminator and used his led lenser lamp instead,what an amazing transformation!,instead of having trouble seeing i could see like there was no fog at all,i don't understand why this should be but it definitely works.any nv experts who can explain this?it obviously only works with digital nv but why? Quote Link to comment Share on other sites More sharing options...
LeadWasp Posted November 19, 2014 Report Share Posted November 19, 2014 Probably backscatter from moisture droplets in the air. If your illuminator is very close to the NV a lot of the IR will be reflected straight back at you. The more offset you have between the illuminator and the NV the less this happens - so by using a lamp NOT on your NV you get a better separation = less reflection. Quote Link to comment Share on other sites More sharing options...
The Mighty Prawn Posted November 19, 2014 Report Share Posted November 19, 2014 Probably backscatter from moisture droplets in the air. If your illuminator is very close to the NV a lot of the IR will be reflected straight back at you. The more offset you have between the illuminator and the NV the less this happens - so by using a lamp NOT on your NV you get a better separation = less reflection. boom - exactly that the light from you is lighting up the droplets in front so the fog seems thick, but when lit from an angle the reflection misses you! Quote Link to comment Share on other sites More sharing options...
FalconFN Posted November 19, 2014 Report Share Posted November 19, 2014 Probably backscatter from moisture droplets in the air. If your illuminator is very close to the NV a lot of the IR will be reflected straight back at you. The more offset you have between the illuminator and the NV the less this happens - so by using a lamp NOT on your NV you get a better separation = less reflection. Quote Link to comment Share on other sites More sharing options...
bsa man Posted November 21, 2014 Author Report Share Posted November 21, 2014 it wasn't lit at an angle which is why it makes no sense to me. Quote Link to comment Share on other sites More sharing options...
Dave-G Posted November 21, 2014 Report Share Posted November 21, 2014 (edited) I think he means if your mate was standing next to you there would be less back scatter to you than to him, bear in mind that your 'torch' is very close to your scope. Edited November 21, 2014 by Dave-G Quote Link to comment Share on other sites More sharing options...
LeadWasp Posted November 21, 2014 Report Share Posted November 21, 2014 Exactly - you don't need to offset by much to make a considerable difference. However it does seem as if the effect is very pronounced on digital NV with IR and this may have something to do with the gain (amplification) in the camera. All NV systems (photo multiplier, digital, digital thermal) use gain (both auto or manual) to display what they sense so will be affected. I'm probably not explaining myself very well but if you get backscatter on a foggy night using the naked eye and a visible lamp it will probably be worse through a sight system. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.