Please see the specifications and instructions below. |
Specifications Portability: Battery operated, fully portable Operation: Handheld or Tabletop Objective lens: diameter 25mm, focal length 110mm Ocular: magnification 25x, eye relief 10mm Target Image: 32 segment Siemens Star Housing: Acetate/PVC Illumination: Battery powered bright solid state 2mA @ 3V Battery: two AAA Battery life: 48 hours continuous Focus resolution: 0.005mm at the focal plane Overall length: 190mm (7.5 inches) Shipping weight: 350g (12 oz) List Price: US$ 165.00 |
AUTOCOLLIMATOR |
AUTOCOLLIMATOR |
Please see the specifications and instructions below. |
Included in this shipment: 1/ autocollimator, 1/ wodden stand, 2/ lens caps, 1/ 35mm Mylar mirror 2/ AAA batteries (inserted) Instructions ____________________________________________________________________ WARNING: Never point the collimator at the Sun ! ! ! ____________________________________________________________________ Using the collimator: 1) To check the viewfinder of an SLR, point your SLR at the target image through the objective lens, and look through the viewfinder. Since the target is at virtual infinity, the lens should come into focus at its infinity setting. 2) To check focus accuracy at the focal plane, place the Mylar mirror or a regular film into the camera. (Drop the mirror onto the inside rails with mirrored side (concave side) first and close the camera door on it.) Place the camera in front of the objective lens of the collimator. Using the B or T setting, open the camera shutter and the diaphragm fully. Set the focus on the camera lens to infinity and look though the eyepiece of the instrument. Focus the eyepiece on the hair line first (see below). The target image seen in the eyepiece should come into focus. If it does not, the camera lens is out of focus or the body is out of alignment. To determine which is the culprit, try the lens on another body or try another lens on the same body. Set-up: 1) Adjust the eyepiece: Point the objective at a white wall. Focus the eypiece onto the hairline. The short white line at the side of the eyepiece barrel indicates the approximate position for a normal eye. The eyepiece has a finer than usual adjustment capability and has no stop. One full rotation of the eyepiece grip produces approximately two diapters of adjustment. 2) Align camera and collimator such that the optical axes of both coinside. Eyeball accuracy is good enough, but you must check alignment from two directions, from the top and from one side as well. Tabletop: Use books or magazines to prop up the camera or the collimator whichever is lower. Use whatever you may have handy, books, magazines, or sheets of plywood or plastic. If you're testing a bulky lens on a small camera, the lens barrel may be protruding beyond the bottom of a camera. In this case you may mount the camera on a tripod and hold the collimator in your hand. Handheld: The same principle applies. Steady the camera on a tripod or table top. Hold the collimator in steady hands. Line up the optical axes by looking through the eyepiece of the collimator. An interesting feature of the autocollimator is that the image does not move out of the viewing area when the collimator is not lined up properly. However the image becomes darker and slightly out of focus. Check and correct alignment to brighten up the image. Unless the axes are grossly misalined, you will see the image. Tilt or turn the instrument until the image is the brightest and the sharpest. The collimator is calibrated at infinity permanently (not adjustable). Set the lens of the camera to infinity, Place a film or the Mylar mirror (A 35mm Mylar mirror is provided.) into the camera. Close the door. Turn on the collimator light. If the camera body is known to be correct, you are testing the lens. If the lens is known to be correct then you're testing the camera body. The collimator indicates an inaccurate focus at the focal plane, but it cannot tell which component is at fault, the camera body or the lens. If you're wearing glasses: When you're looking through the ocular of the collimator remove your glasses and look through the ocular with your naked eye. (Do not remove contact lenses.) The range of the eyepiece adjustment is approximately plus or minus 3 diapters. When looking through the camera viewfinder, keep your glasses on, or use a corrective lens on the camera eyepiece. Replacing the batteries: The red dot at one side of the switch handle indicates the ON position. Do not forget to turn the light OFF when the collimator is not in use. With average use, the batteries may last as long as their shelf life, many years. When the light becomes too dim, the two AAA batteries must be replaced. Unscrew the black end-cup at the end of the Battery housing. Shake out the battery holder. Insert the new batteries into the holder. Watch the polarity! Insert the holder into the barrel in the same position it was before, with the cord behind the holder and the batteries facing up, towards the switch. Screw the cover cup back on. Cleaning: The collimator is sealed, it does not require internal cleaning. If you keep the lens caps on, the objective lens will seldom require cleaning. However the outer surface of the eyepiece lens may get contaminated from eyelashes bating against it. Use lens cleaning solution and lens cleaning cloth or tissue to gently wipe off the glass surface. If the body of the collimator becomes dusty or grimy, use soft cloth dampened in lens cleaning solution to wipe off the outside of the body. |
An easy-to-use, accurate, yet inexpensive focus testing device for the amateur, collector or small-shop operator. |
This item is discontinued Sorry for the inconvenience. |
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