
	Where results make sense

Topic: Porro prism

Related Topics

Dove prism

Prism (optics)

Dichroic prism

Abbe prism

Pentaprism

Binoculars

Eyepiece

Lens (optics)

List of optical topics

NC 17

Quicksaving

PanAmSat

METRORail

Lancelot

A49 road

	[No title]
		Porro was involved in a large project, beginning in 1820, the triangulation of the Piedmont and Lombardy-Venetia area, with the director of Brera observatory Francesco Carlini.
		Cosmos, 1853, pp222-224.) Both the Porro I and Porro II systems were included in Porro's patent of 1854, in France and England, with two sections to the patent: 1, redirection and reversal by prisms, showing two Porro erecting systems for telescopes; and a sighting device (Visiervorrichtung) with a proposal for a rangefinder.
		The third, larger prism of the Porro II design was placed a distance down the handle, and focusing was accomplished by moving this prism by rotating a small disc with the thumb.
	home.europa.com /~telscope/porro.txt (3890 words)

	Porro prism - Wikipedia, the free encyclopedia
		Double Porro prism systems are used in small optical telescopes to re-orient an inverted image (an arrangement is known as a image erection system), and especially in many binoculars where they both erect the image and provide a longer, folded distance between the objective lenses and the eyepieces.
		A single Porro prism is a type of roof prism, though it is not used in this way in binoculars.
		A variation on the double Porro prism is the Porro-Abbe prism.
	en.wikipedia.org /wiki/Porro_prism (325 words)

	Binocular Prisms: Roof or Porro?
		Porro prism binoculars have the classic “dog leg” shape with the eyepiece offset to the one side with respect to the objective or front lens.
		Prisms are expensive, but without them a binocular would always produce upside-down, reversed images, challenging even the most skilled birder.
		Thus we have a trade-off: the slight optical superiority of the typical Porro prism versus the comfort factor of the standard roof prism.
	www.shawcreekbirdsupply.com /roof_porro_prisms.htm (1172 words)

	Binocular stereo-microscope - Patent 4436384
		The ray which enters the Porro prism through the surface 11a is reflected by the surfaces 11b, 12a, 12b and 13b, and goes out through the surface 13a.
		In the present invention, the prism 12 is inclined from the plane vertical to the optical axis O.sub.1 of the objective by an angle.omega..sub.1 as shown in FIG.
		The ray reflected by the surface 12b becomes incident on the surface 13b of the prism 13 in the state that the ray is inclined in respect to the plane vertical to the surface 13b and, then, the ray is reflected by the surface 13b.
	www.freepatentsonline.com /4436384.html (1661 words)

	Optics4Birding.com - All About Optics - Designs
		The porro prism was the first of these two designs and consists of two mirrors mounted separately.
		Most bird watchers are inclined to stick with the slim roof prism design although there are those with big hands that claim that the larger porro prisms are more comfortable for them (I have large hands and do not find this so).
		Modern roof prism binoculars tend to have two separate prisms that are cemented together, rather than two offset prisms of the porro prism design.
	www.optics4birding.com /basics1.aspx (1395 words)

	Porro-Abbe prism - Wikipedia, the free encyclopedia
		A Porro-Abbe prism (sometimes called a Abbe-Porro prism), named for Ignazio Porro and Ernst Abbe, is a type of reflection prism used in some optical instruments to alter the orientation of an image.
		Light enters one flat face, is internally reflected four times from the sloping faces of the prism, and exits the second flat face offset from, but in the same direction as the entrance beam.
		The Porro-Abbe prism should not be confused with the dispersive Abbe prism or the non-dispersive Abbe-Koenig prism.
	en.wikipedia.org /wiki/Porro-Abbe_prism (241 words)

	binoculars101.com - What is the Difference Between Porro Prism and Roof Prism Binoculars? (Site not responding. Last check: 2007-10-12)
		Roof prism, Porro prism (and reversed Porro prism) binoculars each use image-erecting prisms to provide correctly oriented images.
		You will recognize the Porro prism as a "traditional" binocular design with offset prisms while the roof prism binocular has parallel barrels and a more streamlined appearance.
		Porro Prism models will deliver the best optics for the dollar, but lack the durability and compact styling of roof prism models.
	www.binoculars101.com /bin-design-design.html (197 words)

	Pentax Imaging - Binocular FAQ
		Historically, porro prisms were the first types of binoculars, but they had some design limitations.
		Roof prisms were developed because the new design made it possible to build smaller and lighter binoculars.
		Roof prism binoculars are manufactured to closer optical and mechanical tolerances making them more rugged than comparable quality porro prism binoculars.
	www.pentaximaging.com /footer/faqs/faq_sport_optics_binocular.jsp (668 words)

	Roof Prism Binoculars vs. Porro Prism Binoculars -- Report of a test
		And we know Porro prism designs are easier and less expensive to manufacture, because the tolerances are not so demanding.
		We put a top roof prism binocular, the Nikon 10x42 Venturer LX, side by side with the Nikon 10x42 Superior E, which is the top roof prism design by the same manufacturer.
		Although we expected the Porros to be brighter, no one could see any difference in brightness or contrast between the two.
	www.birdwatching.com /optics/roof_vs_porro.html (344 words)

	Birding Binoculars 2: Roof Prisms vs. Porros Prisms
		Porro prism binoculars were standard until the 1960's, when the Zeiss and Leitz companies introduced roof prism binoculars, whose objective lenses were straight in line with the eyepieces.
		Porro prism design has a jog in the light path through each barrel.
		The Porro prism design was simpler and more light efficient, and its images showed better contrast.
	www.birdwatching.com /optics/binoculars2_porro_roof.html (288 words)

	PhotoNotes.org Dictionary - Porro prism (Site not responding. Last check: 2007-10-12)
		A kind of prism commonly used in binoculars and occasionally in cameras.
		Porro prisms are triangular in cross-section - two of the angles are 45° and one is 90°.
		The prism design was invented in 1823 by Italian physicist Ignatio Porro.
	photonotes.org /cgi-bin/entry.pl?id=Porroprism (175 words)

	BirdForum - New Leupold Cascade Porro Prism Binoculars
		If these have good porro optics, this could be the answer for those wanting the optical qualities of porros with the field-worthiness of roofs.
		The prism housing on the Cascade reminds me of the Vixen Foresta, which is similar to the Swift Audubon 820, and the oversized eyecups also look similar to the twist-up cups on those bins.
		Something I found with a few porro prism bins is that the objective barrels aren't long enough for all my fingers to sit comfortably over them.
	www.birdforum.net /showthread.php?t=51199 (4150 words)

	Celestron Binoculars - UpClose
		It’s a great choice for children since these binoculars have no prisms which can break or be knocked out of alignment with rough handling.
		The economically-priced UpClose Porro Prism Series is comprised of five full-size models, including two zoom models.
		UpClose porro prisms are robust full-size binoculars that feature a large knurled center focus knob for smooth and accurate focusing and a diopter adjustment on the right eyepiece for fine tuning the focus to your individual eyesight requirements.
	www.celestron.com /prod_pgs/bino/upclose.htm (443 words)

	BirdForum - Porro prism views! WOW!
		The view of a porro prism is austounding in comparison to roof prisms.
		As long as we are giving praise to porro prism binoculars we would be derelict in out duty not to put in a word or two about what is IMHO (and admittedly limited experience) optically the finest binocular ever made!
		Some day I may find a 9x porro I like, I am now using 9x Travelite, but FOV is too small.
	www.birdforum.net /showthread.php?p=685109 (2497 words)

	Amazon.com: Minox BD 10x44 BP Porro Prism Binoculars: Camera & Photo (Site not responding. Last check: 2007-10-12)
		The use of Porro prisms always implies increased weight and comparatively larger dimensions of the binoculars.
		As a specialist for the miniaturization of optical equipment MINOX has been able to develop compact Porro binoculars minimizing these familiar weak points and maximizing the strong ones.
		With this almost three-dimensional imaging it is a lot easier to exactly estimate the position and distance of the objects in the field of view, something hunters or those practicing water sports will rate very highly.
	www.amazon.com /Minox-10x44-Porro-Prism-Binoculars/dp/B000CQY1ES (537 words)

	Anchor Optics - Porro-Abbe Prism
		A porro-abbe prism is sometimes called a double right angle prism.
		Two of them are used to make an erecting system for telescopes and some models of binoculars.
		One of these prisms can be used to bend an image 90 degrees and rotate a vertical image horizontally.
	www.anchoroptics.com /catalog/product.cfm?id=65 (121 words)

	Bushnell Natureview Porro Prism Models (Site not responding. Last check: 2007-10-12)
		BaK-4 porro prisms on select models yield brighter images and better edge sharpness.
		There are currently no HDO team reviews on this Bushnell Natureview Porro Prism Models.
		There are currently no videos for Bushnell Natureview Porro Prism Models.
	www.hdosport.com /Bushnell-Natureview-Porro-Prism-Models-83.htm (186 words)

	Powerview Binoculars Porro Prism Series - 12 x 25mm
		Porro prism compacts with a clear, wide field-of-view and a variety of magnifications.
		Like their roof prism relatives, the porro prism line-up provides great durability and performance in an atractive ''traditional'' porro prism design.
		Compact to full-sized, the contemporary styling houes fully coated optics.
	www.bestoptics.co.uk /ishop/1017/shopscr98.html (260 words)

	blackfoot Porro Prism Binoculars
		Below you will find a chart explaining the different constructions of the binoculars, the prisms and coatings.
		Compacts use the Porro Prism design on a smaller scale, giving the distinct advantage of both designs.
		They are designed to maximise light transmission and colour contrast, normally reserved for higher priced binoculars.
	www.camping-supplies-uk.com /binoculars/porroprism-binoculars.htm (580 words)

	Green Witch HR WP Porro Prism
		The HR WP series are designed and engineered to provide class beating standards of optical clarity and viewing comfort.
		The single hinge porro prism design allows for easy one hand operation as well providing the necessary space to fit the 5 element long eyerelief eyepieces, large prisms and 26mm dia.
		results are clear, brightness and resolution is a class above similary priced roof prisms which more than makes up for the larger size and weight.
	www.greenwich-observatory.co.uk /acatalog/HR_WP_Porro_Prism.html (236 words)

	Amazon.com: Meade Porro Prism 12X50 Porro Prism Binocular: Camera & Photo (Site not responding. Last check: 2007-10-12)
		This item is not eligible for Amazon Prime, but over a million other items are.
		The replacement for this item is Meade Travel View 12x50 Porro Prism Binocular or you can request this item from another seller.
		From sporting events to bird watching, the Meade 12x50 Porro prism binocular will be more than adequate in suiting those needs.
	www.amazon.com /Meade-Porro-Prism-12X50-Binocular/dp/B00005M2ET (522 words)

	Bushnell H2O Porro Prism Models
		Witnessing beauty in its natural state doesn't have to come with an unnatural price tag.
		There are currently no HDO team reviews on this Bushnell H2O Porro Prism Models.
		There are currently no videos for Bushnell H2O Porro Prism Models.
	www.hdosport.com /Bushnell-H2O-Porro-Prism-Models-83.htm (202 words)

	Bushnell H20 Porro Prism Binoculars
		Thoughts such as, spend enough time on the water, and your equipment will spend some time in it.
		Multi-coated optics and premium quality BaK-4 prism glass maximize light transmission and image clarity.
		You’ll quickly see how a little planning on our part goes a long way to magnify your adventures on and around the water.
	www.sailgb.com /p/bushnell_h20_porro_prism_binoculars (162 words)

	Meade 7x50 Porro Prism Binoculars
		Meade 7x 50mm Porro Prism Binoculars are designed to deliver optimal performance for maximum viewing enjoyment.
		Regardless of your application you will appreciate the superior optics and durable construction that make Meade binoculars an excellent investment.
		Meade Binocular 7 x 50 Porro Prism model is well suited to astronomy, sports or light boating applications.
	www.opticsplanet.net /meade-7x50-porro.html (254 words)

	prism(prism) - optoLife Optics Corporation
		optoLife Optics CorporationHome : Products Product Description: prism(prism), Our prism is widely used in stage lighting, telescope and other illumination systems The following types of prism surfaces we can supply.
		Our prism is widely used in stage lighting, telescope and other illumination systems
		The following types of prism surfaces we can supply.
	www.allproducts.com /manufacture98/optolife/product4.html (129 words)

	Eschenbach 8x21 Porro Prism Monocular
		This compact monocular features a unique Keplerian lens constructed of multi-coated achromatic glass for clear viewing.
		The monocular’s porro prism design helps to minimize the effect of tremors on the image being viewed.
		The rugged exterior features a rubberized, dimpled coating to provide a sure grip.
	www.forestry-suppliers.com /product_pages/View_Catalog_Page.asp?mi=4392 (57 words)

	Bresser - Roof Prism - Porro Prism Binoculars
		Waterproof roof prism binocular for the highest class - high grade and sharp images
		Compact roof prism binocular popular among hunters and nature lovers
		The traditional light intense roof prism binocular for nature lovers and marine
	www.drbnightvision.com /bresser.html (177 words)

	Bushnell PowerView 10x25mm Porro Prism Compact Binoculars
		Like their roof prism relatives the porro prism line-up provides great durability and performance in a "traditional" porro prism design.
		Affordable for any and all interested in magnifying life to its fullest.
		Bushnell PowerView 10-30x25mm Porro Prism Compact Zoom Binoculars
	www.efunctional.com /13-9025.html (357 words)

	Bird Watcher's Digest: Optics: About Prisms
		Home : Optics : Choosing : Bird Watcher's Digest: Optics: About Prisms
		Binoculars today (and most spotting scopes) are available in two general profiles, or shapes.
		No material, information, or images from this site may be used without express permission from Bird Watcher's Digest.
	www.birdwatchersdigest.com /site/optics/prisms.aspx (1230 words)

Try your search on: Qwika (all wikis)