Just when I thought I had see it all, the Leggo and the #32
A long time poster on a local board was given a #4 receiver only and then bought one of the replica scopes. GHe posted for some advice one building a copy of a #4T. Well my advice is next to worthless but I saw he would not stop so I linked him to Peter's very helpful posting and advised him the buy the books. He did some reading and then went to work setting up his scope before drilling or shaving on the receiver and look what he came up with for centering.
Several quotes would fit this but I don't have time just now as I'm diging in the old toy box my kids left behind,,,
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Last edited by MJ1; 01-14-2012 at 10:32 AM.
MJ, don't take this personally, but that's crap.
muffett.2008
Priceless.............. A classic example of 'KEEP IT SIMPLE STUPID'
Hi Peter, could you look at the video below and let me know if the focal plane shift is goign to be a problem?
The post point stays on target, but the whole field of vision seems to shift as I rotate the scope.
Does this mean the scope tube is out of true, or that my V blocks are shifting (to me the seem pretty solid), or is it an artifact of how these reproduction scopes are made?
I can't see a thing! But if, as I understand it, the image (the picture) is or appears to be moving left/right/up/down as you rotate the telescope it means that one of your lenses is acting as a prism and is not ground concentrically.. On a No32, the image will remain identical throughout the telescope 360 degree rotation. So centralizing the grat point will by definition, put the tip into the centre of the optical axis if the telescope optical system.
If yours won't do this, then I don't know what to suggest and as I haven't got it here to see, then I can't comment
Peter, I can get the grat to stay on target throughout the revolution, its just that the image (grat and all) seems to shift about.
I captured a better video of it below.
I'm thinking you're right about a non-concentrically ground lens, and I doubt theres anything to do about it, it is a reproduction and I'll wager not built to MOD standards.
So I guess I'll have to call it as good as I can get and continue on with the build.
The rifle is a non-collectible barreled action, it'll be completely mismatched once it's all built up so I guess a sub optimal scope will suit it.
I would say an eccentric OG lens. This is how you would zero a moving image telescope as against a moving wire telescope. But looking at it positively, when the grat is vertical, it's pretty well in the centre of the tube so take it from there.
As an aside, you can get this effect when you put a smaller diameter Mk1 or 2 OG lens assembly into the front of a Mk3 or L1A1 telescope. If it's not centred, the eccentric effect of the slightly offset smaller OG lens will give this effect.
Just when I thought I had see it all, the Leggo and the #32
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