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Updated: June 7, 2025
You focus the 'scope eyepiece by turning this knurled knob. Then you set the camera to infinity, adjust the iris for the proper light, and put the camera in place. Any questions?" "What aperture?" Rick asked. "Normal exposure?" "Make it one f-stop less than you'd use if you were taking the picture through a regular camera with a long lens. Anything else?" Scotty grinned.
Kennedy adjusted the glass tube containing the liquid which bore the substance scraped from the cartridge he had picked up in the office of Jose. "Look through the eyepiece, Walter," he directed. The field appeared halved. He made an adjustment and at once the field of vision appeared wholly the same tint. When he removed the tube it was dark.
Poking through the ruins, he unearthed broken instruments and a single, battered case that had barely missed destruction. Inside was the binocular microscope, the right tube bent, its lenses cracked and obscured. The left eyepiece still seemed to be functioning. Brion carefully put it back in the case. He looked at his watch. It was almost noon.
In order to ascertain the magnifying power which an eyepiece gives when applied to a telescope it is necessary to know the equivalent, or combined, focal length of the two lenses. Two simple rules, easily remembered, supply the means of ascertaining this. The equivalent focal length of a negative or Huygens eyepiece is equal to half the focal length of the larger or field lens.
"Little bits of glass," he said, briefly, taking his eye from the eyepiece. "Captain Shirley was not shot." "Not shot?" I repeated. "Then how was he killed?" Kennedy eyed me gravely. "Shirley was murdered by a poisoned bomb!" I said nothing, for the revelation was even more startling than I had imagined.
Both lenses have their convex surfaces toward the object glass, and their distance apart is equal to half the sum of their focal lengths. In this kind of eyepiece the image is formed between the two lenses, and if the work is properly done such an eyepiece is achromatic. It is therefore generally preferred for mere seeing purposes.
He took some of the bigger pieces and broke them to rough squares that would fit under the clips on the stage. Lea accepted them without a word. Putting a drop of the magter's blood on the slide, she bent over the eyepiece. Her hands shook when she tried to adjust the focusing. Using low power, she examined the specimen, squinting through the angled tube.
And then he saw the eyepiece of the telescope with a lot of red smears on it. He began to remember. "You've made this observatory in a pretty mess," said Thaddy. The Dyak boy was beating up an egg in brandy. Woodhouse took this and sat up. He felt a sharp twinge of pain. His ankle was tied up, so were his arm and the side of his face.
The outermost ring is considerably brighter, however, than it would be if the same gradation applied to it as applies to the inner rings, and it is surrounded, moreover, on its outer edge by a slight flare which tends to increase its apparent width. Next let us return to the focus and then move the eyepiece gradually inside the focal point or plane.
"Oh, no, though it could be done," returned Tom, pointing the instrument toward the crest of a wooded hill several miles distant from Shopton. "Now we're ready. Take a peek." "Well," said Ned, peering into the eyepiece, "all I see are a few trees." "Just stand by," directed his friend, clamping his green disk over the front lens, or objective, of the telescope and turning on the current.
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