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Posted: 12/18/2009 3:09:50 PM EDT
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Hi, the eyepiece on the rear of my GenIII PVS/4 is loose. Does anyone know how to fix this or someone that does?
Thanks. -dan |
It is easy to do but kinda hard to explain. The PVS-4 is a proximity focused scope. The tube actually moves back and forth to focus the unit. Best way is to start from scratch. Unscrew the entire ocular assembly at the focus ring. It will unscrew all the way off. You will then see the tube inside (try to keep as much dust out as possible. I use a aerosol air can and a vac to get my stuff clean). Now turn the focus ring all the way down clockwise and thread the assembly back onto the tube and housing by the focus ring. When it is all the way tight you should then be able to back off just the focus ring to focus the scope. This is not hard to do but I am having a hard time explaining it to you.  Anyone else want to take a stab at it to explain it better ? If you can't sort it out IM me your phone number and I can talk you through it. It is a little tricky and if you don't get it right the scope won't focus.
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Quoted:
It is easy to do but kinda hard to explain. The PVS-4 is a proximity focused scope. The tube actually moves back and forth to focus the unit. Best way is to start from scratch. Unscrew the entire ocular assembly at the focus ring. It will unscrew all the way off. You will then see the tube inside (try to keep as much dust out as possible. I use a aerosol air can and a vac to get my stuff clean). Now turn the focus ring all the way down clockwise and thread the assembly back onto the tube and housing by the focus ring. When it is all the way tight you should then be able to back off just the focus ring to focus the scope. This is not hard to do but I am having a hard time explaining it to you. Anyone else want to take a stab at it to explain it better ? If you can't sort it out IM me your phone number and I can talk you through it. It is a little tricky and if you don't get it right the scope won't focus.Ok, I did all that. It unscrewed just forward of the ocular lens adjustment. Still loose. Right behind the obj. focus ring there is a screw that holds two halves together. Do I need to undo that? The looseness seems to originate at least as far forward as the objective focus ring. Thanks! -dan |
| Dan, I am not sure we are on the same page. Can you take a photo of your scope to show where your problem is ? Basically the scope comes apart in 4 pieces. The objective lens, the body of the scope which holds the tube and switches, the ocular assembly and the eyecup. I have two ocular assembly's and one of them comes apart in two pieces. It is a camera adapter assembly. In between the two focus rings the two halves will screw together. There are many different variants of the PVS-4 and some have a little different features. Photos would really help me understand where your problem is. On my standard PVS-4 ocular assembly there are a few set screws in between the two halves. Is this what you are saying is loose ? |
Heres a pic. You can see the screw I was talking about. When I followed your directions, the eyepiece assembly came off right behind the big adjustment ring. The looseness seems to be at or in front of the big adjustment ring. (right behind the adjustment knobs.) Sorry if I am being dense. -dan |
| Ok, now I understand. That is your focus lock ring. It is used to adjust how far the focus ring will travel. It just locks down with a allen wrench. Wait till it gets dark then go outside and back the focus off till you can focus in close then lock the ring down with the wrench. The minimum focal distance is in the manual. Don't try to bring the focus in to close or you will unscrew the assembly off the tube. The lock ring will then prevent you from backing the focus off to far. If you back it off to far the assembly will come loose from the tube and won't focus correctly. |
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Setting the focus assembly. Remove the "lock collar" that adjusts the limit of turning the focus knob. Tighten the focus ring until it's all the way in. Now back it off until you can focus the stars at night. Focus it carefully, then put the lock collar back on and rotate it gently counter-clockwise until it hits the stop inside the focus ring (don't turn the focus ring ) - Now back it off about a half-centimeter or so and tighten the locking collar. You're done :) Both halves should be well locked together now - David. |
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