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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
NIFE 40cm rangefinder
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<blockquote data-quote="LouBoyd" data-source="post: 634240" data-attributes="member: 9253"><p>Your picture didn't come though on LRH but I think i found your photo on The Practical Machinist forum. For some reason I can't repost the image on LRH, but it can be viewed here:</p><p></p><p><a href="http://www.practicalmachinist.com/vb/attachments/f45/45229d1331220453-ot-optical-rangefinder-rangefinder-8-3-12.jpg" target="_blank">http://www.practicalmachinist.com/vb/attachments/f45/45229d1331220453-ot-optical-rangefinder-rangefinder-8-3-12.jpg</a></p><p></p><p>Apparently a model AP-40 has some major differences compared to the AP-40-P. The markings on the photo show the magnification is 8X. Having the objectives at each end and two eyepieces would definitely indicate it's made to be used horizontally as you surmised. The erect and normal image is typical for horizontal rangefinders. This image shows how the images should relate when it's in use, though this image is from a different make and model rangefinder. </p><p><img src="https://encrypted-tbn3.google.com/images?q=tbn:ANd9GcR2GbdY_L8I3Xr7qWcbAm9Yu_a3AxernG6anZdCE_X-_mWvIafxew" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p>This would be measuring the distance to the church spire. </p><p></p><p>This diagram shows how the images move when you adjust the range measurement knob. This is not specifically for the A-40:</p><p><img src="https://encrypted-tbn3.google.com/images?q=tbn:ANd9GcQXVJbEyQ5af7b7wMLn7kXOYOpnemd-4AfPaSy4Dx6mQ411goBYyQ" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The second knob on my A-10-P moves the left image so a given object can be moved so it's abutted exactly adjacent to it's other half. Then the image (at that range) will appear complete as with a spotting scope. The second knob on your AP-40 probably moves the inverted image up and down so the selected portion of the two images can be easily compared, as with the spire in the photo above. Part of the art of using this type of rangefinder is picking objects which have clearly visible lines perpendicular to the direction the images move when the range knob is adjusted. Diagonal lines or random shapes are not reliable. </p><p></p><p>The other "user" adjustment is the eyepiece diopter knob. On the AP-10-P it has +/- 3 diopter range. Does the A-40 have individual adjustments for each eye? Those should just be set for comfortable clear images. They should not affect the range measurement. </p><p></p><p> 200 to 4000 would no doubt be the direct reading range in meters. What is the next written number smaller than 4000 and how many divisions are between those numbers? That will give an indication of it's usable distance resolution at maximum range. </p><p></p><p>Take it out and try it on some objects at ranges from 200 to 4000 meters. From your description so far (and seeing your photo of the unit) I'd bet it's working normally. On the A-40-P the infinity setting is not a user adjustment. I suspect that's adjusted at a higher maintenance level, but the user can check it on a very distant object, like a bright star.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 634240, member: 9253"] Your picture didn't come though on LRH but I think i found your photo on The Practical Machinist forum. For some reason I can't repost the image on LRH, but it can be viewed here: [url]http://www.practicalmachinist.com/vb/attachments/f45/45229d1331220453-ot-optical-rangefinder-rangefinder-8-3-12.jpg[/url] Apparently a model AP-40 has some major differences compared to the AP-40-P. The markings on the photo show the magnification is 8X. Having the objectives at each end and two eyepieces would definitely indicate it's made to be used horizontally as you surmised. The erect and normal image is typical for horizontal rangefinders. This image shows how the images should relate when it's in use, though this image is from a different make and model rangefinder. [IMG]https://encrypted-tbn3.google.com/images?q=tbn:ANd9GcR2GbdY_L8I3Xr7qWcbAm9Yu_a3AxernG6anZdCE_X-_mWvIafxew [/IMG] This would be measuring the distance to the church spire. This diagram shows how the images move when you adjust the range measurement knob. This is not specifically for the A-40: [IMG]https://encrypted-tbn3.google.com/images?q=tbn:ANd9GcQXVJbEyQ5af7b7wMLn7kXOYOpnemd-4AfPaSy4Dx6mQ411goBYyQ[/IMG] The second knob on my A-10-P moves the left image so a given object can be moved so it's abutted exactly adjacent to it's other half. Then the image (at that range) will appear complete as with a spotting scope. The second knob on your AP-40 probably moves the inverted image up and down so the selected portion of the two images can be easily compared, as with the spire in the photo above. Part of the art of using this type of rangefinder is picking objects which have clearly visible lines perpendicular to the direction the images move when the range knob is adjusted. Diagonal lines or random shapes are not reliable. The other "user" adjustment is the eyepiece diopter knob. On the AP-10-P it has +/- 3 diopter range. Does the A-40 have individual adjustments for each eye? Those should just be set for comfortable clear images. They should not affect the range measurement. 200 to 4000 would no doubt be the direct reading range in meters. What is the next written number smaller than 4000 and how many divisions are between those numbers? That will give an indication of it's usable distance resolution at maximum range. Take it out and try it on some objects at ranges from 200 to 4000 meters. From your description so far (and seeing your photo of the unit) I'd bet it's working normally. On the A-40-P the infinity setting is not a user adjustment. I suspect that's adjusted at a higher maintenance level, but the user can check it on a very distant object, like a bright star. [/QUOTE]
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NIFE 40cm rangefinder
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