与 «PARFOCAL»相关的英语书籍
在以下的参考文献中发现
parfocal的用法。与
parfocal相关的书籍以及同一来源的简短摘要提供其在 英语文献中的使用情境。
1
Lasers in Ophthalmology: Basic, Diagnostic, and Surgical ...
(Reproduced from Fankhauser et al.' by courtesy of the publisher.) draspheric
lens compared to the other two auxiliary lenses (Fig. 5). Two optical systems for
controlling laser spot size are currently in use, namely, parfocal (generic par-
focal) ...
Franz Fankhauser, Sylwia Kwasniewska, 2003
2
The Practice of Surgical Pathology: A Beginner's Guide to ...
Parfocal. Parfocality means that if an image is focused at 40×, you should be able
to switch to 4× and still be in focus. It is not the same as Köhler illumination. You
can achieve parfocality only on a microscope with two adjustable eyepieces; ...
Diana Weedman Molavi, 2008
3
Star Ware: The Amateur Astronomer's Guide to Choosing, ...
Another term that is frequently encountered in eyepiece literature but rarely
defined is parfocal. This simply means that the telescope will require little or no
refocusing when one eyepiece is switched for another in the same set. Without
parfocal ...
Philip S. Harrington, 2011
A "doubly parfocal" lens is shown in Figure 10. This is a "focal modifier rod",
consisting of a single rod of fused silica. The rays tend to converge at the front
surface and diverge at the second surface, even though these are concave and
convex ...
Such eyepieces are referred to as being parfocal with each other. Most eyepiece
series are parfocal within the series. For example, all Tele Vue Radians are
parfocal with each other, as well as with most Tele Vue Plossls, most Tele Vue ...
Robert Bruce Thompson, Barbara Fritchman Thompson, 2005
6
Fundamentals of Light Microscopy and Electronic Imaging
When the nosepiece is rotated to change to a new parfocal objective, the
operator can reestablish focus with only a minor adjustment to the fine focus knob
. Most manufactures use a parfocal distance of 45 mm, but Nikon microscopes
have a ...
Douglas B. Murphy, Michael W. Davidson, 2012
7
Digital Astrophotography: A Guide to Capturing the Cosmos
Parfocal Eyepiece for Focusing An eyepiece that is “parfocal” to your webcam
can be rather helpful for future applications. This means that the eyepiece, as
well as the webcam provides a sharp image in the same focus position. For this,
you ...
8
Principles Of Microbiology:M&S
This type of microscope is, therefore, capable of magnifying the image of a
specimen 100, 400 and 1,000 times, respectively. Another important feature of
compound microscope is the property of parfocal (par means equal). This means
that ...
9
Membrane Potential Imaging in the Nervous System: Methods ...
Two microscope designs used for imaging. (A) For experiments involving minimal
-to-no conventional intracellular recording we use a standard compound
microscope. A parfocal digital camera is used to focus the PDA, and to provide a
picture ...
Marco Canepari, Dejan Zecevic, 2010
10
Photography with a Microscope
The parfocal distance is the distance between the focused plane of the specimen
and the shoulder of the nosepiece into which the objective is screwed. Modern
objectives usually have a parfocal distance of 45 mm; old ones (to about 1970) ...
Fred Rost, Ron Oldfield, 2000
包含词语«PARFOCAL»的新条目
找出国内和国际出版社所讨论的内容，以及词语
parfocal在以下新条目的上下文中是如何使用的。
Save Money by Checking Out Canon's Best Older Gear
It's also a parfocal lens, meaning focus will be maintained when focal length is changed. Autofocus, while not lightning fast, is quite good and ... «Fstoppers, 七月 15»
Orion edge-on planetary eyepieces
The absence of field curvature is accompanied by generous eye relief and focal lengths that are parfocal. Coming in 3mm, 5mm, 6mm, 9mm, ... «Astronomy Now Online, 六月 15»
Sigma 24-35mm f/2 - Ultra Fast Full Frame Zoom Lens
The Sigma 18-35mm f/1.8 performed fantastically as both a parfocal lens (doesn't alter focus when zooming) and constant aperture lens. «cinema5D news, 六月 15»
Apple Patent Tips 3-Sensor Camera, True Zoom Lens on Next iPhone
These are also referred to as parfocal lenses," it notes. TechCrunch reports that the light-splitting technology might be costly to implement on ... «NDTV, 三月 15»
Meade's Series 5000 Mega Wide Angle Eyepieces
Each Mega Wide Angle eyepiece incorporates blackened lens edges to enhance contrast, and their parfocal design requires little or no focus ... «Sky & Telescope, 一月 15»
Sierra-Olympic Introduces LWIR Chassis Camera with Continuous …
The Vinden CZ 640 has a 35 -105 mm continuous-zoom parfocal lens with a 3x optical zoom, 4x digital zoom, and horizontal field of view ... «PR.com, 九月 14»
Panasonic FZ1000 Shooter's Report Part I
That's likely because the lens isn't parfocal -- that is, when the zoom position is adjusted, focus can change at the same time. Still, with a fixed ... «imaging resource, 八月 14»
Optically Inclined
... to align two cameras to a dual port, the system is essentially two complete, high-performance parfocal and parcentric cameras in one. Geared ... «R & D Magazine, 二月 14»
Sony RX10 Camera Unveiled, Get the First Look
Does it have parfocal focussing? ... The two constant aperture F2.8 Panasonic G series lenses igetsmart refers to below are parfocal but of ... «YouTube, 十月 13»
This May Be the Biggest Lens Ever Used on a Mirrorless Camera
The zoom of the lens, which a powerful 100x magnification, is controlled using a wired remote. The lens is also parfocal, which means that once ... «PetaPixel, 六月 13»
