I've got a Bushnell Legend 5-15x with an adjustable objective. The problem is, on the best of days the objective is stiff to adjust, when the scope gets cold, as is the case when outside this time of year, it is stiffer than crap to try to turn and adjust. Someone else I know has a Bushnell and has the same issue. Is there anything that can be done to loosen it so it is more user friendly? Thanks.
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Stiff Objective Adjustment
- Thread starter delmer
- Start date
I've got a Bushnell Legend 5-15x with an adjustable objective. The problem is, on the best of days the objective is stiff to adjust, when the scope gets cold, as is the case when outside this time of year, it is stiffer than crap to try to turn and adjust. Someone else I know has a Bushnell and has the same issue. Is there anything that can be done to loosen it so it is more user friendly? Thanks.
The front lens rides in and out on a greased rubber o-ring on many scopes. This allows parrallax adjustment and sealing. The grease is getting solid in the cold. If Bushnell used a synthetic grease that remained softer through a wider range, this might help. Call their repair/warranty department and ask if they could supply a wider temperature range (cold weather) grease, that wouldn't become liquid in the summer heat. You might have to help them research such a grease, mentioning others having the same problem, or you will get the standard factory grease in any repair.
NormB
I had earlier emailed the repair center at Bushnell Canada, and just recieved their reply. In short, they replied that as an end user there is nothing that I can do to fix the problem myself. I can though, send in the scope to the repair center where they will evaluate the problem and determine what, if anything can/needs to be done.
NormB, do you know how to disassemble the objective so that the o-ring is accessible? I am thinking they use some sort of silicon based lube to ensure a watertight seal. This type of lube flows okay at room temp, but has the consistency of tar when exposed to cold.
NormB, do you know how to disassemble the objective so that the o-ring is accessible? I am thinking they use some sort of silicon based lube to ensure a watertight seal. This type of lube flows okay at room temp, but has the consistency of tar when exposed to cold.
I had earlier emailed the repair center at Bushnell Canada, and just recieved their reply. In short, they replied that as an end user there is nothing that I can do to fix the problem myself. I can though, send in the scope to the repair center where they will evaluate the problem and determine what, if anything can/needs to be done.
NormB, do you know how to disassemble the objective so that the o-ring is accessible? I am thinking they use some sort of silicon based lube to ensure a watertight seal. This type of lube flows okay at room temp, but has the consistency of tar when exposed to cold.
Well we've had a 36X apart. The range ring is held on by 3 tiny screws with loctite. I have now only 2 functioning. The parrallax adjustment is a pin and helix, slot affair when turned, the pin moves in and out along the helix and a big coil spring forces the front lens element against the o-ring. You can unscrew the front lens element but you have to slip the slot over the pin. If the scope is gas filled you can lose it. A substitute for gas could be 120 deg F dry air from a kitchen oven.
I suggest you call them and talk to them about your problem and the possibilty of using a better cold weather grease. Let them do it.
