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Topic: Infrared filter

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	INFRARED PHOTOGRAPHY
		Infrared photography is of interest to the amateur and commercial photographer and to scientists and technologists because it produces images that are not possible with conventional photographic films.
		In infrared photographs made outdoors from the ground or from the air, grasses and the foliage of deciduous trees appear white because of the high near-infrared transmission characteristic of green chlorophyll and the high infrared reflectance of the underlying cellulosic structure of these subjects.
		Infrared photographs have been used for the construction of charts, the study of sandbars and silting of navigable channels, the control of erosion and pollution, the charting of currents, and the study of marine life.
	www.rit.edu /~andpph/text-infrared-basics.html (3854 words)

	Infrared filter - Wikipedia, the free encyclopedia
		An infrared filter is a filter to remove visible light and only pass infrared light in different wavelengths.
		There has been several reports that using exposed and developed film works as an infrared filter.
		The theory is that the film goes jet-fl thus blocking visible light but allowing infrared to pass.
	en.wikipedia.org /wiki/Infrared_filter (110 words)

	Reflected infrared photography: Filters
		An infrared transmission filter must either be used over the camera lens in a light-tight mount for the normal technique, or over the light source in total darkness for the night surveillence technique.
		These infrared transmission filters are visually opaque, or depending on the type, may reveal some deep red transmission when viewing a bright light source.
		The Wratten 87 is often selected as the standard infrared filter as it has a sharp cut-off at 750nm, and transmits freely throughout the infrared region.
	msp.rmit.edu.au /Article_03/02c.html (1328 words)

	Infrared Photography by Thom Hogan (Site not responding. Last check: 2007-08-08)
		Infrared is a spectrum of light beyond that which we normally see.
		Infrared light focuses at a slightly different point than visible light, so make sure that you use an aperture in Step 6 that has a decent depth of field.
		Once you’ve taken an infrared shot, you’ll probably want to manipulate it a bit to make it better emulate the look of infrared film, which has unusual "color" (white foliage, for example) and a bit of graininess and bloom to edges.
	www.bythom.com /infrared.htm (1122 words)

	[No title]
		The filter set was optimized to be insensitive to atmospheric effects for observatories at altitudes higher than 2 km.
		We are not producing the K and K' filters for the reason that the Ks filter was used by the 2MASS survey and this filter has good performance at both low and high altitudes.
		Filter to be designed for a tilt of 5 degrees to suppress ghost images.
	www.ifa.hawaii.edu /faculty/tokunaga/MKO-NIR_filter_set.html (706 words)

	Filter - Wikipedia, the free encyclopedia
		See filter (chemistry), filter (water), filter (air), pneumatic filter.
		See filter (software), filter (Unix), mail filter, printer filter, Internet filter, lameness filter.
		Filter feeder, an animal that strains food particles from water
	en.wikipedia.org /wiki/Filter (153 words)

	Infrared Photography: Photography Techniques: Learn: Digital Photography Review (Site not responding. Last check: 2007-08-08)
		With most imagers, even if they do respond to infrared light, their sensitivity to this part of the spectrum is very poor and exists many, many stops lower than their response to visible red, green and blue.
		Most of the red, green and blue filters (or magenta, cyan, yellow and green filters in Canon digital cameras) at the surface of the chip are fairly IR transparent.
		Infrared wavelengths are longer and focus at a different distance behind the lens.
	dpreview.com /learn/Photography_Techniques/Infrared_Photography_01.htm (1549 words)

	Making an Improvised Infrared Transmitting Filter
		The result of this is that it appears that one thickness of E6 film is roughly the equivalent of an 87 filter but with a broader spectral response and with some 1% transmission valleys at 500 and 600 nm.
		The spectral transmission curves for the 1 and 2 sheets of E6 film, and that of a Wratten 25 and 87 filter are attached below.
		I also used one and two layers of Ektachrome film as a filter in front of my camera's lens and the images were not totally fuzzy and unusable.
	www.rit.edu /~andpph/text-infrared-filter.html (459 words)

	Canon 1D Mark II and 20Da Infra-Red Daylight Tests
		The correct exposure for the filter on the 1DMII was 1/30th sec at f/2.8 at ISO 1600.
		The correct exposure for the filter on the 20Da was 1/80th sec at f/4 at ISO 400.
		The subject of color rendition with these DSLR cameras while using infrared filters is apparently a complicated one, involving factors such as the sensitivity of the CMOS sensor chip, the Bayer filters used, the infrared filter used and the white balance algorithms.
	www.astropix.com /HTML/M_DAP/M011/M011.HTM (1015 words)

	CoCam: Infrared Photography - Infrared FAQ
		Infrared light is reflected from the camera film pressure plate back onto the film and records as halos if the pressure plate is flat and without "dimples".
		IR filters are generally opaque so normal use with an SLR means that when the filter is attached to the front of the camera then you cannot see through the viewfinder.
		Filters can be used in front of the lens or at the film plane using a thin piece of filter material taped across the film rails inside the back of the camera.
	www.cocam.co.uk /CoCamWS/Infrared/INFRARED.HTM (11965 words)

	Near Infrared Digital Photography Tutorial
		Infrared photography has been around for at least 70 years, but until recently has not been easily accessible to those not versed in traditional photographic processes.
		The #25 filter lets in a significant amount of red light, and is often used in traditional photography because it allows image previewing through the viewfinder.
		Our next goal is to size the filter to an appropriate size, and then apply a mask to the infrared layer to let the color image through everywhere except for the area inside the filter.
	www.echeng.com /photo/infrared/tutorial (2379 words)

	Hoya RM100 Infrared Filter IR Transmitting 1000nm (Site not responding. Last check: 2007-08-08)
		This professional-grade filter is made of 2.42 mm thick high quality Hoya optical glass and has Hoya's Anti-Reflective coating applied to both the front and back filter surfaces which increases the quality of the resulting infrared image.
		Each filter is packaged in a protective plastic filter case and a Hoya Transmittance Chart for the RM100 is included for reference.
		Note the signature infrared characteristics of these images captured in sunlight: white foliage because infrared light is reflected by the plants, and dark skies and water because it is absorbed.
	home.att.net /~infraredvideo/ir_video-000000.htm (380 words)

	Infrared Spectrometer Filter Is Electrically Tunable - March, 2002 (Site not responding. Last check: 2007-08-08)
		Portable infrared spectrometers enable in situ analysis of compounds in a variety of hazardous environments on Earth and in space.
		To construct the filter, the researchers stacked two 400 x 25 x 25-µm silicon plates, chosen for their electrical conductivity, infrared transparency and high reflectance.
		By electrostatically deforming the reflectors of the filter, the researchers found that they could tune for infrared wavelengths and could modulate their intensities to select the signatures of specific compounds.
	www.photonics.com /spectra/tech/XQ/ASP/techid.1328/QX/read.htm (397 words)

	wrotniak.net: Infrared Photography with a Digital Camera
		To answer the question briefly: photographs in infrared show quite unusual tonality, different than that to which we are used, and this may make them esthetically pleasing, at least in many cases.
		Here is a brief comparison of the infrared filters, including those made by B+W, Hoya, and Tiffen as of November, 2004, Those generally available in glass (as I've checked at B&H in November, 2004) are marked in bold.
		The small amount of visible (far red) light which this filter lets through does not affect pictures enough to spoil the IR effect, while coloring your images red (or purple), therefore they need to be converted to monochrome in postprocessing.
	wrotniak.net /photo/infrared (3018 words)

	Infrared Filter Comparison (Site not responding. Last check: 2007-08-08)
		The camera was mounted on a tripod and the shutter was released using the self timer.
		The autogain feature of the camera firmware (v 1.3) resulted in ISO adjustment for longer exposure with the B+W 093 (87C) filter.
		Note the changes in tonal values of the foliage and sky with the different filters.
	homepage.mac.com /scho/MySlideshow/filtercomp.html (96 words)

	Nikon D70 IR cut filter removal
		In this equation n is the refractive index of the filter glass (n=1.517 for BK7) and E is the thickness of the filter (E is near 1.33 mm for the D70).
		Right, the IR-cut filter is removed: The white balance is largely modified by the increased contribution of red photons.
		The thickness of this filter is 1.1 mm (compare to the 1.33 mm thickness of the original filter - the focus is not perfect).
	www.astrosurf.org /buil/d70/ircut.htm (1038 words)

	Infrared Filters and Spectral Sensitivity
		Attach the filter by screwing it in the front mount or inserting it in a holder such as Cokin's or Lee's.
		The filter may be made of coated glass, or uncoated gelatin, resin, and polyester.
		Attach the filter with a little help of adhesive tape between the film rails behind the shutter or, as a more difficult alternative, in front of the shutter but still behind the mirror if you're using a SLR.
	www.pauck.de /marco/photo/infrared/filter/filter.html (1016 words)

	Amazon.com: B + W 77mm Infrared Filter # 092 (89B): Electronics (Site not responding. Last check: 2007-08-08)
		This dark red filter is primarily for fl and white infrared films.
		With color infrared film it produces pictures of a pure red image while making good use of the relatively low sensitivity of infrared films.
		It is used with fl and white infrared films with a sensitivity up to 1000nm.
	www.amazon.com /exec/obidos/tg/detail/-/B0000BZLAU?v=glance (378 words)

	Kleptography - Don Ellis - Canon G-series Infrared Conversion
		I discovered infrared photography in 2001 when I added a Hoya R72 infrared filter to the Lensmate adapter on my Canon G1, put the camera on a tripod and pressed the shutter.
		The culprit is the internal infrared cut filter ("cut" as in cuts infrared light down or out, depending on its strength), also known as a hot mirror.
		I suppose it's possible to find a screw-on filter that duplicates the effects of the infrared cut filter so you can shoot color, but your best bet is to consider your converted camera infrared-only.
	www.kleptography.com /notes-irconvert.htm (3479 words)

	Amazon.com: The Art of Infrared Photography: Books (Site not responding. Last check: 2007-08-08)
		To the author's credit, he doesn't make infrared photography out to be more difficult than it is. But the book doesn't give the reader an understanding of the choices and styles that infrared photography offers.
		Infrared film could not be discussed without the rules of focusing and the use of filters being addressed.
		Filters for infrared, filter factors and exposure compensations are listed in an easy-to-read chart.
	www.amazon.com /exec/obidos/tg/detail/-/0936262508?v=glance (2214 words)

	How to Shoot IR
		Put a filter in front of their lens that blocks visible light, and the camera will automatically adjust its focus and exposure, showing you the resulting infrared image on your cameras LCD in real time.
		When I go looking for infrared images, I'll often walk with one eye to the LCD viewfinder and the other open to see what's around me. I shoot lots of images, as there are no expensive film and processing costs to deal with.
		All the images in the Vizcaya Gallery were taken with a Sony DSC-F707, a Harrison and Harrison 88a filter, and two.6 ND filters (reducing the exposure by 4 stops).
	www.infrareddreams.com /how_to_shoot_ir.htm (1603 words)

	Infrared filter for WeaponLights with 1.375" diameter bezel F12 (Site not responding. Last check: 2007-08-08)
		Infrared filter for WeaponLights with 1.375" diameter bezel F12
		The F12 slip-on infrared filter cancels out the non-infrared portion of the light spectrum to produce a smooth beam of infrared light for use with night vision devices and infrared-capable video cameras.
		The spring-loaded cover flips open with slight thumb pressure, and is held open by spring tension until manual pressure is applied to re-close the cover.
	www.impactguns.com /store/SF-F12.html (145 words)

	Shooting Digital Infrared
		Put the right filter in front of the lens to block visible light, and the camera will automatically adjust its focus and exposure, showing you the resulting infrared image on your cameras LCD in real time.
		For those who have worked with infrared films in the past this is nothing short of a miracle.
		When you place a sharp cut IR filter in front of your digital camera's lens, you are granted entry to an invisible world.
	bermangraphics.com /press/infrared.htm (1603 words)

	ECHENG.COM: Eric Cheng, Digital Infrared Photography
		Consumer digital cameras use hot mirror filters to filter out infrared light, but some infrared light gets through, which is what we're interested in capturing.
		I found that the Nikon Coolpix 950 was capable of producing high quality infrared images when used in conjunction with #87 and #87C filters.
		When the Nikon Coolpix 990 was released, it was discovered that Nikon (or the CCD supplier) had improved the hot mirror filters in the camera, necessiting the use of different filters to effectively capture infrared light (#88A or #89B filters).
	www.echeng.com /photo/infrared (905 words)

	- SHOP.COM
		· This dark red filter is primarily for fl and white infrared films.
		· With color infrared film it produces pictures of a pure red image while making good use of the relatively low sensitivity of infrared films.
		· Filter factor is determined by the film sensitivity.
	www.shop.com /op/aprod-p26990470 (312 words)

	eBay - hoya infrared filter, Lenses Filters, Film Camera Accessories items on eBay.com (Site not responding. Last check: 2007-08-08)
		HOYA 58mm R72 INFRARED FILTER and ND8 NEUTRAL DENSITY
		Hoya 72mm Infrared IR R72 Filter 72 Filtre NEW IN CASE
		Hoya 58mm Infrared IR Filter for Canon EOS / EF NEW
	search-desc.ebay.com /search/search.dll?query=hoya+infrared+filter&... (562 words)

	Canon Digital Photography Forums - Hoya R72 Infrared Filter and G3 - First Tries
		I have wanted to try infrared with my G3 but had read that the results would not be that good.
		I've been using an RM90 filter (it was given to me) and the exposures are 10-15 seconds in bright daylight.
		With filter off: compose and focus, locking by hitting the M (manual focus) button.
	photography-on-the.net /forum/printthread.php?t=25449 (1295 words)

	58mm Black 093 (87C) Infrared Glass Filter (B+W-65072487) - PriceGrabber.com
		Description: This fl infrared filter will filter out entire visible spectrum.
		Filter factor is determined by the film sensitivity.
		Report a pricing error on the 58mm Black 093 (87C) Infrared Glass Filter
	www.pricegrabber.com /search_getprod.php/masterid=724640 (97 words)

	Infrared Digital Photography
		The Hoya R72 is the perfect starter IR filter.
		Steve's infrared shots with an 89b filter and the Canon G1.
		Better color quality should result, but Hot Mirror filters are very expensive, so experimenting with them can set you back a few bucks.
	tedfelix.com /IR (405 words)

	Surefire Infrared Filter (FM13) (Site not responding. Last check: 2007-08-08)
		The FM13 Infrared Filter cancels out the non-infrared portion of the light spectrum to produce a smooth beam of infrared light for use with night vision devices and infrared-capable video cameras.
		Applying thumb pressure to the locking tab releases the cover; a spring mechanism keeps the open cover out of the way by holding it flat against the flashlight.
		Cam-locking lever keeps filter securely attached to flashlight
	www.impactguns.com /store/SF-FM13.html (137 words)

	Tiffen 72mm Infrared #87 Filter
		Infrared filters reduce visible light to varying degrees while allowing the transmission of infrared light.
		Infrared #87 blocks all visual light and is intended for fl and white film only.
		Adorama Camera, Inc. 42 West 18th Street New York, NY 10011 Any problems with this site please contact Webmaster
	www.adorama.com /TF72IR87.html (49 words)

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