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Topic: Pentaprism

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	Pentaprism - Wikipedia, the free encyclopedia
		A pentaprism is a five-sided reflecting prism used to deviate a beam of light by 90°.
		A variant of this prism is the roof pentaprism which is commonly used in the viewfinder of single-lens reflex cameras.
		This reflection is done by replacing one of the reflective faces of a normal pentaprism with a "roof" section, with two additional surfaces angled towards each other and meeting at a 90° angle.
	en.wikipedia.org /wiki/Pentaprism (274 words)

	Single-lens reflex camera with built-in flash - Patent 4910542
		When a flash is secured over a pentaprism, the joint of the flash and the body of a camera has such a low mechanical strength that the joint is very likely to be damaged when the camera fitted with the flash on the body of the camera is carried.
		A portion of the sliding mechanism 138 is exposed at a side of the pentaprism casing 22 so that when the exposed portion is moved forward by the photographer, the sliding mechanism is displaced forward to move the pin 136 forward.
		The pentaprism section 502 is provided with an engaging lever 510 on which a hook, which is engaged with the pin 507b, is provided at the tip of the lever 510.
	www.freepatentsonline.com /4910542.html (9557 words)

	Single-lens reflex camera with built-in flash - Patent 5066967
		According to another aspect of the present invention, the light emission means of the built-in flash is moved to the non-operating position by the attaching foot of the external flash when the attaching foot is inserted into the attaching shoe mounted o the pentaprism casing of the camera.
		A pentaprisum 210 is used as an optical unit for a view finder The pentaprisum 210 is provided in a pentaprism casing 212.
		24 also shows a pentaprism 515 which is used for viewing through the main lens 516 and a viewing port 517 and an associated lens 518 An axis 519 of the main lens 516 defines a principal photographic direction.
	www.freepatentsonline.com /5066967.html (8938 words)

	Removing the Foam Around the Prism of an OM-1/OM-2 (Site not responding. Last check: 2007-11-01)
		The pentaprism is held into the body by a spring mechanism which straddles the top of the pentaprism.
		With the pentaprism removed, carefully clean the back of the eyepiece with some lens cleaning tissue lightly soaked in Isopropyl alcohol or lens cleaning fluid.
		When the pentaprism is seated properly in the frame it should fit snugly, there should be no movement from side to side.
	olympus.dementia.org /Hardware/tutorials/FoamRemoval (1418 words)

	SLR: Single Lens Reflex Cameras - Digital Cameras Outlet
		Most SLRs use a pentaprism to observe the image via an eyepiece, but there are also other finder arrangements, such as the waist-level finder.
		This cross-section (side-view) of the optical components of an SLR shows how the light passes through the lens (1), is reflected by the mirror (2) and is projected on the matte focusing screen (5).
		When an image is taken, the mirror moves in the direction of the arrow, the focal plane shutter (3) opens, and the image is projected in the film (4) in exactly the same manner as on the focusing screen.
	www.digital-cameras-outlet.com /article/SLR (628 words)

	Soviet slr cameras (Site not responding. Last check: 2007-11-01)
		Asahi Pentax, 1957, was the first Pentax with a pentaprism.
		It also had the clip-on meter that mounted over the pentaprism and was linked to the shutter speed dial by a spring-loaded pin.
		Metering is provided by a removable CDS meter that clips onto the viewfinder eyepiece and sets over the pentaprism (there were at least two types, the one shown being the later model).
	home.att.net /~wayne.cornell/camera/pentax.html (458 words)

	The Art of Seeing » Photography Glossary of Terms (Site not responding. Last check: 2007-11-01)
		Pentaprism: This prism corrects the inverted image from lens to upright position suitable for viewing and directs it to the viewfinder.
		This light is reflected to the pentaprism by a mirror.
		The pentaprism, directs it to the viewfinder and in the process corrects the inverted image.
	www.thezeal.com /blog/?p=63 (3247 words)

	SLR Basics (Site not responding. Last check: 2007-11-01)
		Without the pentaprism the image would appear upside down and backwards.
		The pentaprism allows for the photographer to compose with ease.
		The viewfinder eyepiece is the part the photographer looks through as she prepares to take a picture.
	www.peninsula.wednet.edu /classroom/hummelj/beginning/SLRbasics.shtm (1188 words)

	Pentaprism view finders for MK II - FM Forums
		Pentaprism view finders for MK II One thing that really bugged me on most DSLR's was the "usually" horrible view finder.
		b) The Pentaprism arrangement like the Canon T90 has -- I know with AF all the rage it's not really necessary but I do use MF a lot and love this type of viewfinder.
		Re: Pentaprism view finders for MK II I believe you mean the focusing screen?
	www.fredmiranda.com /forum/viewtopic_archives.php?TopicID=70117&page=0 (309 words)

	Pentprsm.len - A pentaprism
		A pentaprism changes the direction of a beam by 90 degrees.
		The pentaprism system included here is intended as a base system into which you can insert your own optics as required.
		The sides of the prism are rectangular, so each surface must have a rectangular special aperture, calculated according to the standard pentaprism geometry.
	www.sinopt.com /software1/usrguide54/examples/pentprsm.htm (377 words)

	The Camera
		The mirror is on an angle so it reflects light up onto a horizontal glass focusing screen where the dog's image is formed.
		Light is then reflected through a pentaprism, a piece of glass with five sides.
		Because of the two sets of lenses, compacts don't need a pentaprism or a hinged mirror--making them smaller and lighter than the SLRs.
	www.yesmag.bc.ca /how_work/camera.html (960 words)

	Betterphoto.com Photography Q&A - 35mm SLR Vs. Other 35mm Cameras
		This means the image is viewed through a single lens, bounced around a pentaprism and then out the eyepiece/viewfinder.
		When the shutter button is pressed, a mirror in the pentaprism lifts upward and out of the way, which allows the image to be projected onto the film after the shutter opens.
		This is because a pentaprism isn't needed, and there isn't a mirror to "slap" the camera every time the shutter button is pressed.
	www.betterphoto.com /forms/qnaDetail.asp?threadID=9003 (458 words)

	PhotoNotes.org Dictionary - Pentaprism
		Pentaprisms were one of the key technical breakthroughs which permitted the creation of SLRs and their through-the-lens viewing capabilities.
		The 1949 Zeiss Ikon Contax S was the first SLR with a built-in pentaprism.
		These solid glass prisms direct light up from the lens into the viewfinder, and account for the large, bulky and characteristically pyramidal shape of the top of SLR cameras.
	photonotes.org /cgi-bin/entry.pl?id=Pentaprism (278 words)

	Dust on the pentaprism?? - FM Forums
		I believe I have some dust on my 10D's pentaprism.
		I've had dust on my 10D's pentaprism for close to a year and it has yet to affect my ability to make decent images with the camera.
		Visible dust is generally on the mirror, focusing screen or viewfinder, not inside the pentaprism (or whatever variation thereof your camera uses).
	fredmiranda.com /forum/viewtopic_archives.php?TopicID=106092&... (739 words)

	Static 35mm Adapter Solution [Archive] - The Digital Video Information Network
		Nearly all SLR cameras use a roof pentaprism - a plain pentaprism (as you have shown, which is not like the ones in most SLR cameras) leaves the image laterally inverted.
		Once I had the roof pentaprism off my minolta and was able to look down at the 45 degree slanted mirror I noticed the image was upright.
		Also after playing with the roof and pentaprisms, I realize although the roof prism is smaller at 28x28mm compare to the pentaprism at 24x35mm, it's possible to "see" approximitly the full frame passed from the pentaprism of 24x35mm.
	www.dvinfo.net /conf/archive/index.php/t-18690.html (14209 words)

	Soligor Spot Sensor II
		The built-in pentaprism viewfinder with 100mm/F2.8 lens ensures the metering precision of 1°.
		The subject area covered by the very small metering angle of 1 degree is indicated by a small circle in the pentaprism viewfinder.
		The brightness of even minute detail in the subject field can be measured easily and quickly.
	www.hotbuyselectronics.com /soligor_spot_sensor_ll_.htm (159 words)

	Brief History of Pentax Cameras - Photoxels
		The Pentax (derived from PENTAprism refleX) camera was the first camera to incorporate a pentaprism viewfinder and a reflex mirror system.
		Another coup by Pentax with the use of a pentaprism in the viewfinder of the Asahi Pentax SLR.
		The pentaprism allows eye-level viewing and provides an upright and laterally correct image.
	www.photoxels.com /history_pentax.html (1116 words)

	SRT102
		The SRT102 also has a pentaprism that sticks out further than that of the SRT101 and SRT100.
		There is a new plate on the front of the pentaprism with a tiny window on the bottom that allows the f-stop to be displayed in the viewfinder.
		This same approach had been used in the XK of 1972 and was adapted to the SRT102.
	www.members.aol.com /manualminolta/srt102.htm (1107 words)

	Samsung Digital Cameras (Site not responding. Last check: 2007-11-01)
		One of the many features unique to GX 1S is the 2.5-inch large LCD that displays the high-quality of the pictures just taken.
		GX 1S has adopted the Pentaprism viewfinder to capture larger and clearer images, enabling the user to easily identify subtle changes.
		The Pentaprism uses the reflecting surface processed with deposition and coating technology that increases penetration efficiency, thus ensuring a large and clear view, high magnification of 0.95, and the high picture coverage of 95%, that would be impossible with mirror-based technology.
	www.samsungcamerausa.com /productdetails.asp?productid=186 (789 words)

	Electronic viewfinders for digital cameras \| DigicamGuides.com
		All digital SLR cameras (with the exception of the few that use electronic viewfinders) have a pentaprism inside the camera.
		A pentaprism reflects light so that when you look through the viewfinder you see exactly what the lens sees.
		A viewfinder with a pentaprism is probably the easiest way to get accurate photographs.
	www.digicamguides.com /learn/electronic-viewfinder.html (723 words)

	Medium Format Digest Forum: P67 TTL vs Pentaprism
		this might be a really stupid question, but i notice that KEH sells P67s with both TTL and Pentaprism meters.
		On the P6x7II, the marketing part urges the buyer to have the new P6x7II with the TTLII pentaprism - a fine matrix meter with lots of info in the finder.
		Some users opt for the flip-top, waist level finder, some for non-ttl pentaprism, some for "chimney" magni-finder, and some for the ttl versions.
	www.photo.net /bboard/q-and-a-fetch-msg?msg_id=008KiA (218 words)

	Deluxe Double Right Angle Pentaprism
		Housed within the barrel are two pentagonal prisms separated by a 3 mm optically flat foresight viewing glass.
		The upper pentaprism offers a right angle view of approximately 90° to the right of your line of sight (foresight) while the lower pentaprism gives you a right angle view of approximately 90° to the left of your foresight.
		Contained within the barrel is a 1 oz.
	www.forestry-suppliers.com /product_pages/View_Catalog_Page.asp?mi=5807 (102 words)

	Camera Review - Pentax 67 II Specs
		Optional 67II AE pentaprism finder attached, the 67II offers aperture priority AE operation through six-segment, center-weighted or spot metering modes.
		Viewfinder image area is 90% with AE pentaprism finder 67II or pentaprism finder 67II; 100% with folding focusing hood 67II or rigid magnifying hood 67II.
		When making extended time exposures, the P.S. (Power saving) time function can be used instead of the bulb mode to minimize power consumption and save batteries.
	www.camerareview.com /templates/camera_details.cfm?camera_id=161 (102 words)

	Nikon F2 with DE-1 Pentaprism (Site not responding. Last check: 2007-11-01)
		It turned out they had the Black F2 Pentaprism lying around and sold it to me for a song.
		I'd consider trading this one for a silver one but that may be unlikely.
		I also need a DE-1 Pentaprism for my 1965 Nikon F.
	www.salocal.com /nikon_f2/favorite_nikon_f2.htm (139 words)

	Steve's Digicams - Breaking News - Pentax 02/26/03 Press Release
		With the clarity of 6.1 effective megapixels, a pentaprism viewfinder, and a 1.8 inch LCD monitor, the *ist D will feature one of the world's smallest, lightest camera bodies in the digital SLR category.
		Along with the *ist D, PENTAX announces an exciting wide angle lens for 35mm AF SLR cameras, the smc PENTAX-FA J Zoom 18-35mm F4-5.6 AL.
		An optical pentaprism viewfinder developed especially for the *ist D makes viewing easy with an ample 95% field of view and 0.95X magnification.
	www.steves-digicams.com /pr/pentax_02262003_istD_pr.html (919 words)

	Canon U.S.A
		Film Rewind: Automatically rewinds at the end of the roll.
		Flash: Built-in, retractable TTL autoflash head in the pentaprism.
		Red-Eye Reduction: Red-Eye Reduction Lamp Lights while the shutter button is pressed halfway and focusing and metering are achieved.
	www.usa.canon.com /html/cameras_slr/eosrebelgspec.html (420 words)

	[No title]
		1° with fixed roof pentaprism finder, but with a viewing path 45 degrees, second with fixed prism-finder, a little time after Contax S and Rectaflex
		1° with modern fixed pentaprism, together with Contax S and Alpa Prisma Reflex
		1° japanese 35mm SLR with a roof pentaprism, and interchangeable
	www.geocities.com /RainForest/Andes/3256/innocams.html (589 words)

	Pentax Imaging: 67II AE Pentaprism Finder - Medium Format - Film - Accessories - Cameras by Pentax (Site not responding. Last check: 2007-11-01)
		Pentax Imaging: 67II AE Pentaprism Finder - Medium Format - Film - Accessories - Cameras by Pentax
		This eye-level finder features Aperture-Priority AE operation and six-segment multi-pattern metering (with selectable center-weighted and spot metering).
		(450g) · Catalog No.: 38000 AE Pentaprism Finder 67II
	pentaximaging.com /products/product_details?reqID=10029&... (91 words)

	Pentaprism Finder (NON-Metered) for All 67 Cameras (Pentax-37401) - PriceGrabber.com
		Pentaprism Finder (NON-Metered) for All 67 Cameras (Pentax-37401) - PriceGrabber.com
		Pentax Pentaprism Finder (NON-Metered) for All 67 Cameras
		Report a product or pricing error on the Pentaprism Finder (NON-Metered) for All 67 Cameras
	www.pricegrabber.com /search_getprod.php/masterid=21989741 (113 words)

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