How to use the reticle in my Fujinon Mariner Binoculars?
I have the Fujinon 7x50 Mariner binoculars with built-in compass. I no longer have the instructions. I forget exactly how to use the ranging reticle, should be something like dist = 1000 * (height / #marks), but I can't remember if there's another conversion factor or something. Also, no longer remember if the longer-shorter alternation in the size of the marks is for ease-of-use or for halves (are five marks "5" or "2.5").
Re: How to use the reticle in my Fujinon Mariner...
How to use the reticle:
The vertical scale (reticle) visible through the left half of the binocular, above the compass display, allows you to calculate distance to an object if you know its height, or to calculate the height of an object if you know its distance from you.
Each mark on the vertical scale has a value of 5 MIL (1Mil is equivalent to an angel that can determined an object one meter in height at a distance of 1000 meters). Therefore, if a navigation chart gives the height of an object, by sighting on it and counting the number of MILS, you can determine how far away it is.
To Measuer distance when height is known:
Object Height(m)/Scale Reading x 1000m=Distance in Meters
To Measure height when distance is known:
Distance(m)xScale Reading/1000=Object height in meters
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Open the battery door, clean all inside with Alcohol & Q-tip. Check that the AG10 or 389 batteries are positive up. Now the compass dial pivots on a shaft. It seems to get caught. Take a strong magnet and rotate it above the compass lying horizontal and spin it until it spins freely. Take it away slowly. Does the compass settle down to accurate heading? If so place back in the top of the model 322BCW observing the glued in marks on the clear window area. Re-screw in, press brass button red LED should light.. If NOT recheck for corrosion. Regards, Don
I've been thinking about this for awhile, and it seems to me you're experiencing a factory defect. I don't have one of these devices, or I'd know what "normal" was for compass, but if you can't easily have the display centered, something is out of kilter. Was it always like this, or did it just start occurring recenty? Your best venue would be to contact Fujinon support and see if they will replace or fix the problem. Here is their site: http://www.fujinon.com/NewsAndEvents/PressReleases/pr.aspx?id=84
Good luck, and hope this helps.
You are correct that the lines are for rangefinding. This is what is called a reticle. Without seeing how they are set up it is hard to determine the scale used. Most scales are in meters, some in yards, but they all work the same. Go to any of the following websites and download the instruction manual.
Go to Tasco and search for the Offshore OS 36 or 54 manual. OR go to Steiner Optic and download the manual for the Military 7x50 or Commander or Navigator models.
These instruction manuals have details and diagrams of how to read a rangefinder reticle.
Basically if you know the distance to an object you can estimate its height or size. OR if you know the size of an object you can estimate the distance to the object.
Its easier to explain seeing a diagram. Go to Tascos website and download the instruction manual for the Offshore binoculars or Steiner Optic website and download the general binoculars instruction manual. It has all of Steiners models incuding those with a reticle. Most reticles are the same and there is no difference between meters and yards as your calculations are an approximate.
If your Fujinon is an ex military unit it has what is known as an M22 reticle. It is only slighlty different as it is graduated in mils but the calculations is the same. If it is the M22, google Binocular M22 manual. The military number for this is TM 9-1240-403-12 & P