christophe17
Member
Hi all. This is my first post on this forum, although I've been a long time lurker who found a lot of informations about bins here.
I just bought a pair of Bausch&Lomb 7 x 24 discoverer on Ebay Uk, for a reasonable price ( 25 £). I immediately fell in love with this ugly bulky little thing. There's no collimation problem, and the image is bright and quite sharp from edge to edge. But .... ebaying always means taking a risk.
The problem is that I have to turn the diopter adjustment on the right ocular all the way up in order to bring both images in focus, and even that way, there's still a little difference. One image is not perfectly sharp. My eyes are not faulty, as on my other bins I usually let the diopter around O.
I don't want to send them to Bushnell repair service for this would mean sending them from France, with a high probability to have them returned with a " sorry, bins are too old" message. I'd rather save to buy me a brand new 7x26 Elite Custom instead. So I'd like to try to fix it myself.
I've been scratching my head for a few days and here are my conclusions.
Such a difference in diopter adjustment between the two barrels means the optical distance between ocular and objective lenses are different : one is longer than the other. When looking through the objectives, I noticed that one lens was a bit closer to the border than the other, so the distance from the objective lens to the prism is certainly different. Could this be the cause of my problem?
Another solution would be to change the distance between the ocular and the prism. In some bins there are hidden screws around the diopter ocular, enabling to re-set the diopter adjstment. I couldn't see these screws on my Discoverer bins. If I unscrew the whole eyepiece, will I find a way to modify its distance from the prism, i.e. its height ?
I know there are bin repair gurus around here, and any advice will be welcome in order to help me bring this little gem to life again. Thanks in advance.
I just bought a pair of Bausch&Lomb 7 x 24 discoverer on Ebay Uk, for a reasonable price ( 25 £). I immediately fell in love with this ugly bulky little thing. There's no collimation problem, and the image is bright and quite sharp from edge to edge. But .... ebaying always means taking a risk.
The problem is that I have to turn the diopter adjustment on the right ocular all the way up in order to bring both images in focus, and even that way, there's still a little difference. One image is not perfectly sharp. My eyes are not faulty, as on my other bins I usually let the diopter around O.
I don't want to send them to Bushnell repair service for this would mean sending them from France, with a high probability to have them returned with a " sorry, bins are too old" message. I'd rather save to buy me a brand new 7x26 Elite Custom instead. So I'd like to try to fix it myself.
I've been scratching my head for a few days and here are my conclusions.
Such a difference in diopter adjustment between the two barrels means the optical distance between ocular and objective lenses are different : one is longer than the other. When looking through the objectives, I noticed that one lens was a bit closer to the border than the other, so the distance from the objective lens to the prism is certainly different. Could this be the cause of my problem?
Another solution would be to change the distance between the ocular and the prism. In some bins there are hidden screws around the diopter ocular, enabling to re-set the diopter adjstment. I couldn't see these screws on my Discoverer bins. If I unscrew the whole eyepiece, will I find a way to modify its distance from the prism, i.e. its height ?
I know there are bin repair gurus around here, and any advice will be welcome in order to help me bring this little gem to life again. Thanks in advance.