Velocette Posted March 21, 2015 Report Share Posted March 21, 2015 I have an AGS Swat 4/16/56 scope mounted on my 452 which is normally only used with a Cobra NV. Its out in all weathers and really does get a soaking on bad nights but I,ve never seen any sign of condensation. This morning was bright and sunny when I popped out to check the zero and after about 10 mins in the sun noticed a circle of internal condensation in the eyepiece and another at the sharp end! I,ve just stripped and cleaned the eyepiece but the other end has me beat. Has anyone any ideas or suggestions as to who could do the work and re charge it with nitrogen ? Failing that,,,it will have to be a Vampire scope and only come out in the dark and cold. Quote Link to comment Share on other sites More sharing options...
brent52 Posted March 21, 2015 Report Share Posted March 21, 2015 once youv,e opened your scope up I think it,s ruined could be mistaken though Quote Link to comment Share on other sites More sharing options...
wymberley Posted March 21, 2015 Report Share Posted March 21, 2015 (edited) I have the same scope so am aware of the build quality and suspect that economic repair is not viable. All I can think of is, A. has the weight of the add on somehow (knocked perhaps) caused some movement and allowed the pre-charge to release or, B. after zeroing have you ever reset the dial to zero by following the instructions as failure to do so can cause damage but they don't define what that actually could be or whether it affects the pre-charge. Edited March 21, 2015 by wymberley Quote Link to comment Share on other sites More sharing options...
Rem223 Posted March 21, 2015 Report Share Posted March 21, 2015 If you can find a source of dry gas, it doesn't have to be nitrogen, you could use Argoshield for example. Blow that into the tube at low pressure to purge the humid air it has in it now. It wont be perfect but better than it is now I suspect. Quote Link to comment Share on other sites More sharing options...
Velocette Posted March 21, 2015 Author Report Share Posted March 21, 2015 I have the same scope so am aware of the build quality and suspect that economic repair is not viable. All I can think of is, A. has the weight of the add on somehow (knocked perhaps) caused some movement and allowed the pre-charge to release or, B. after zeroing have you ever reset the dial to zero by following the instructions as failure to do so can cause damage but they don't define what that actually could be or whether it affects the pre-charge. I think you may have something there. I do need the eyepiece focussing ring screwed out quite a way to give a clear picture of the crosshairs and have noticed some up and down movement as a result. This may be where the pre-charge has escaped from. If you can find a source of dry gas, it doesn't have to be nitrogen, you could use Argoshield for example. Blow that into the tube at low pressure to purge the humid air it has in it now. It wont be perfect but better than it is now I suspect. Good plan,,I'll have word with a friend who does MIG welding and see what we can do. Thanks. Quote Link to comment Share on other sites More sharing options...
wymberley Posted March 21, 2015 Report Share Posted March 21, 2015 I think you may have something there. I do need the eyepiece focussing ring screwed out quite a way to give a clear picture of the crosshairs and have noticed some up and down movement as a result. This may be where the pre-charge has escaped from. Good plan,,I'll have word with a friend who does MIG welding and see what we can do. Thanks. You do seem to like the water cooled option. Sorry, I'll get me coat! Quote Link to comment Share on other sites More sharing options...
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