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Topic: Teleconverter

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	Teleconverter - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-19)
		A teleconverter is a group of lenses which is mounted between the camera and a photographic lens.
		The location of a teleconverter is such that the image produced by the objective is located behind the teleconverter in a distance smaller than its focal length.
		The use of objective with teleconverter is less expensive than telephoto lens but also introduces some aberrations.
	www.northmiami.us /project/wikipedia/index.php/Teleconverter (339 words)

	Tamron Learning Center:70-300mm/1.4X Teleconverter guide 35mm, Digital Lenses, Commack NY
		The SP AF PRO-series teleconverters, with a newly designed optical construction (4-group/5-element for 1.4X and 4-group/7-element for 2X), are designed to be used with lenses that are F/2.8 and of focal lengths of 90mm or greater.
		The standard Tamron teleconverters extend the focal length by a factor of 1.4 or 2 respectfully and sustain the same light loss factors as the Pro-series.
		Though using a teleconverter on wide-angle lenses is never really recommended, these converters can be used with lenses that are wider than 90mm and are ideal for all lenses that are not F/2.8's.
	www.tamron.com /lenses/tele-guide.asp (1326 words)

	Tamron 70-300mm/1.4X Teleconverter guide (Site not responding. Last check: 2007-10-19)
		Even when using the teleconverter, high quality images are maintained throughout the entire focal range all the way up to 420mm.
		When you use a teleconverter, sometimes AF does not work correctly in dark places or on objects where the contrast is low.
		When the 70-300 lens and 1.4X teleconverter are used together, the macro capability is increased to an incredible 1:1.43 magnification.
	www.central-camera.com /tamron/lens-ext-combo.htm (980 words)

	AF Teleconverter for 35-70 f2.8?
		The “useable” teleconverter for the AF 35~70/2.8(D) is the TC-14A.
		First, it's not true that "Teleconverters work best with telephoto lenses, mostly 200mm and longer." Teleconverters work best when the desgn of the teleconverter matches the location of the exit pupil of the lens, and when the front element of the teleconverter can come as close as possible to the rear element of the lens.
		Nikon actually had a series ot teleconverters (TC-14A and TC-201) that were made for lenses with exit pupils relatively close to the film (or sensor), and rear elements that were close to the mirror of an SLR camera.
	www.photo.net /bboard/q-and-a-fetch-msg?msg_id=00BVLF (1379 words)

	Sigma AF 1.4X Teleconverter Lens
		The new dedicated 1.4x APO Teleconverter features a high performance 5 element/3 group optical design, and it is optimized for use with long telephoto and telezoom lenses.
		The high performance optical characteristics of this teleconverter maintains the optical performance of the compatible lenses with which they can be used.
		Using 10-pin electrical interfaces, there is no loss of autofocusing speed when this teleconverter is used with compatible H.S.M. type lenses for Canon, Sigma, and now Nikon AF cameras (except N50/F50 models).
	www.hotbuyselectronics.com /item_detail.php?item_id=272 (108 words)

	Re: What kind of camera or telescope would u need to get a good view of the site from Tikaboo? (Site not responding. Last check: 2007-10-19)
		A 2x teleconverter means you have 1/4th the light, i.e.
		This is because the secondary mirror of most telescopes is not large enough to fully illuminate a 35mm frame when used "prime" (no teleconverter).
		An alternative to the teleconverter (and a bit to complicated to discuss in a post) would be eyepiece projection.
	www.dreamlandresort.com /forum/messages/6572.html (588 words)

	Auxiliary lenses for popular Oly digitals (Site not responding. Last check: 2007-10-19)
		The 1.45x to 5x teleconverters covered in this article are all of excellent optical quality with no light loss and varying degrees of vignetting at full zoom.
		The compact Oly C-210 and C-180 teleconverters also have many attractive qualities, but both produce vignetting across all Oly rangefinder and C-2100UZ zoom settings—even when mounted on rangefinders with the Oly CLA-1 lens adapter and a single step-up ring.
		The C-180 is an attractive teleconverter for Oly digital rangefinders in many respects, but the required 43-52 mm step-up ring can be hard to come by.
	www.dpfwiw.com /c-2000z/lenses/index.htm (8337 words)

	Nikkor 200 mm F2.0 AF-S VR lens: Digital Photography Review
		A brand new TC-17EII 1.7x teleconverter is also introduced (sold separately) to enhance the range of focal length options to factors of 1.4x, 2.0x and now, 1.7x respectively.
		The use of such teleconverters with a wide aperture lens is an ideal way of adding extra focal length versatility without the expense and weight of additional lenses.
		May 28th 2004: 07:00 CET: Nikon Europe is pleased to announce the introduction of a brand new photographic accessory, the AF-S Teleconverter TC-17E II - the first teleconverter to offer a 1.7x lens focal length magnification, but with exposure compensation kept to just 1.5 stops.
	www.dpreview.com /news/article_print.asp?date=0405&article=04052801nikkor200 (1208 words)

	Steve Norvich Photographic Resume (Site not responding. Last check: 2007-10-19)
		It seems that the pins on this teleconverter are slightly shorter than the pins on the original Nikonos RS lenses.
		As such, the pins on the original lenses will eventually wear a very slight groove when mounting these lenses to the camera body which make the pins on the teleconverter not quite touch their contact points.
		This problem will not occur on all camera bodies and it is not really the fault of the teleconverter.
	www.underwaterphotos.com /nikonsrs.htm (213 words)

	Teleconverter F-stop limitation
		Teleconverters are designed for use with long lenses and sometimes cause problems with wide and normal lenses, but they work most of the time.
		A f/4 lens with a 2x teleconverter results in a f/8 effective f-stop which can be too small (too large a f-figure) for your camera to auto focus.
		I have used the nikkor50mm.1.8 lens and used vivitar 2x teleconverter with wonderful results the very high resolution of this lens when matched to the teleconverter really does deliver.
	www.photo.net /bboard/q-and-a-fetch-msg?msg_id=000kT8 (539 words)

	AF-S Teleconverter TC-17E II (Site not responding. Last check: 2007-10-19)
		With dimensions of just 66 x 31.5mm (2.6 x 1.2 in.) and a weight of only 250g (8.8oz.)(approx.), the AF-S Teleconverter TC-17E II allows focal length to be extended by a factor of 1.7 times while retaining a sense of overall comfort in the hand.
		Many such teleconverters can also have a detrimental effect on the speed of the lens, however the AF-S Teleconverter TC-17E II makes available f-stops only 1.5 stops slower.
		Teleconverters are ideal for adding photographic versatility without the high expense of an extra lens.
	www.nikonmalaysia.com.my /news_TC17EII.htm (318 words)

	Stacking Teleconverters (Site not responding. Last check: 2007-10-19)
		Teleconverters have always been a mystery to me when I first started photography.
		The answer I always get is that with a 1.4x teleconverter, the lens lose one stop of light and becomes 1.4 times longer.
		After stacking multiple teleconverters with my Canon 300mm f/4 L lens, I have noticed that ordering of the teleconverter makes a difference on the sharpness of the image.
	www.camerahacker.com /stacking_teleconverters (725 words)

	Stacking Jessop 2x Teleconverters on a Canon EOS 300D
		Incidentally, this is why they make 1.4x teleconverters, as 1.4 is approximately the square root of 2 and reduces the maximum aperture by 1 stop.
		Using stacked 2x teleconverters clearly reduces the sharpness of the image, but then it is allowing you to get closer to the action.
		The photo taken using a single 2x teleconverter (left) was scaled by 200% so it could be compared directly with the photo taken with two 2x teleconverters (right).
	www.jibble.org /stacking-teleconverters (1389 words)

	Digital Camera Resource Page - Forums - d70 teleconverter 4 tamron 28-300 di
		Because the rear group of some Zoom Lenses will go further back and touch the glass of the teleconverter, not just the problem of vignetting.
		For example the Nikon AF-S 17-35mm cannot be used is due to this reason.
		I don't see the point either, but I think that Samuel Lo was just giving an example of a lens that cannot be used with a teleconverter because of the rear lens element.
	www.dcresource.com /forums/printthread.php?t=6206 (375 words)

	Teleconverters for Nikkor SLR Lenses
		Teleconverters (sometimes referred to as extenders) effectively increase the focal length of a lens.
		Teleconverters accomplish their task through the use of optics to further magnify the object to be photographed.
		In general, teleconverters are designed for short (200mm and less) or long (300mm and greater) lenses and can not be switched back and forth.
	www.nikonlinks.com /unklbil/teleconverters.htm (930 words)

	Camera Equipment Review (Site not responding. Last check: 2007-10-19)
		With the addition of Sigma's APO 1.4 EX teleconverter, the lens has an effective focal length range of 140mm to 420mm and a constant f/5.6 aperture.
		With the teleconverter attached, there was a very slight degradation of autofocus performance, as well as a very slight loss of sharpness and contrast, which is expected
		The most noticeable effect of the teleconverter (in terms of image quality) was light fall-off in the corners of the frame with the lens wide open at f/5.6, which was substantially reduced by f/8.
	www.naturephotographers.net /je1001-2.html (876 words)

	Blow up vs. teleconverter
		Professional-grade teleconverters are generally optimized for use with specific lenses; these lens/teleconverter combinations sometimes rival the resolution and contrast of the lens alone.
		Changing the focal length of the lens, using a teleconverter, or enlarging a portion of the image give identical perspective provided that object distance and overall magnification are equal in all cases.
		If the main subject is the same size in the final image produced with a teleconverter, compared to enlarging the central portion of the negative made without a teleconverter, everything in the final image will have the same perspective.
	www.photo.net /bboard/q-and-a-fetch-msg?msg_id=000XDD (1433 words)

	Some thoughts on the Olympus 1.45x teleconverter lens (Site not responding. Last check: 2007-10-19)
		The front of the teleconverter has no filter thread, so filters and lens-hood cannot be screwed onto the teleconverter.
		I think the reason is because the teleconverter does not extend the aperature away from the film plane.
		The 1.45x teleconverter extends the field-of-view to that of a 159.5 mm lens.
	www.camerahacker.com /Olympus_C-2500L/Olympus_1_45x_teleconverter.html (261 words)

	BirdForum - Nikon TC3-ED Teleconverter
		My question is off topic however, I believe that Andy has used this teleconverter and perhaps others so am asking the question here.
		With the teleconverter can I still use the macro mode and does it allow me to be more distant, for example 3 times more distant and get the same image size as without the teleconverter if I were 3 times closer?
		I found the optical quality of this tc brilliant, just that with many birds you are still short in focal length and tend to zoom in on your pc more to view it, therefore the subject can look a bit scatchy compared with a full frame subject as in digiscoping.
	www.birdforum.net /showthread.php?t=2824 (1126 words)

	Hasselblad 1.4XE Teleconverter Multicoated
		Using the Hasselblad Teleconverter 1.4XE is a convenient way to expand oneÍs range of telephoto lenses.
		The Teleconverter 1.4XE features the same outstanding optical and mechanical quality as all the lenses in the Hasselblad system.
		The Hasselblad Teleconverter 1.4XE can be used with all Hasselblad lens types of current and previous series with a focal length of 100 mm or longer (except the Makro-Planar CF 5.6/135 mm).
	www.cambridgeworld.com /hasselblad_1.4xe_teleconverter_multicoated.htm (138 words)

	[No title]
		Hello Norm, thanks for posting the results from your new Panasonic teleconverter, I have been waiting to see results from this converter.
		After seeing the substantial collar that is fitted to the Panasonic teleconverter and the quality available with this lens I can now understand why it is priced above other teleconverters.
		Teleconverter Lens specs: weight 22.5 oz; diameter: 3.62 inches; total length: 5.24 inches (comes with: lens cap, tripod adapter, storage bag).
	www.stevesforums.com /forums/view_topic.php?id=25790&forum_id=23 (2359 words)

	2xtele
		California underwater photographer Michael Bjornbak took a shot on just his second roll of film with his new 2x which won him a free trip to Papua New Guinea as the Grand Prize in a photo contest, a picture which subsequently was given a full page in the June issue of Islands Magazine.
		In fact, one of the photos that I took with the teleconverter last year received "Highly Commended" honors in the 1997 BBC Wildlife Photographer of the Year competition.
		The teleconverter itself is so small I hardly notice the difference with or without it.
	www.rstours.com /html/2xtele.html (816 words)

	Teleconverter (2X) (Site not responding. Last check: 2007-10-19)
		This inexpensive 2X teleconverter was purchased at a local pharmacy.
		To use a teleconverter, the existing lens is removed fromt he camera and the converter is mounted on the camera and then the lens is mounted on the front of the converter between the camera and the lens in use.
		As might be expected with a low priced item, there is a significant loss in image quality when this teleconverter is used.
	archwparsons.topcities.com /teleconverter.html (156 words)

	Nikon Nikkor TC-14E Teleconverter Test Review © 2004 KenRockwell.com
		Nikon makes NO AF teleconverters for its general line of AF lenses.
		Just for fun, you can attach another manual focus teleconverter to the rear of this, but not the front.
		It is not like the old TC-201 teleconverter that was intended for general use to make a normal lens into a telephoto.
	www.kenrockwell.com /nikon/tc14e.htm (432 words)

	macrophotography.org - Close-Up Techniques
		Teleconverters come in different sizes, the most common being 1.4x, and 2x.
		The daisy at left, for example, was taken with a Nikon 3T close-up attachment on a 35-105mm AF Nikkor mounted on a N90.
		I lose autofocus and matrix metering with the teleconverter, which is not a problem if I'm shooting a flower, but is a problem if I'm chasing a butterfly from bloom to bloom.
	www.macrophotography.org /modules.php?name=News&file=article&sid=8 (967 words)

	Canon Digital Photography Forums - teleconverter lens
		It would be nice to have a longer reach for wildlife but between lens weight and vignetting, it isn't practical for hand held G3 use.
		As predicted a single filter on the lens adapter before the teleconverter has very little impact on the non-vignetted zoom range.
		Of course it is more convenient to use the teleconverter when it lives on its own lens adapter without filters, or closeup elemets.
	photography-on-the.net /forum/printthread.php?t=14276 (671 words)

	LensMateOnline - A85/A75/A70/A60 Tele Conversion Lens Samples
		These teleconverter samples were taken using the LensMate 37mm and 52mm lens adapters on the Canon A85.
		The 35mm film equivalent would be 35mm - 105mm, therefore the multiplier is about 6.48 when converting one to the other.
		To determine the focal length of the A85 with a teleconverter added, simply multiply the focal length of the camera by the power of the teleconverter.
	www.lensmateonline.com /A85teleconverters.html (259 words)

	Re: Tamron F teleconverter 2X (Site not responding. Last check: 2007-10-19)
		In Reply to: Tamron F teleconverter 2X posted by Pat Miller on April 07, 2002 at 10:07:32:
		: Hi I have a Tamron Teleconverter that was on a kalimar lens that was given to me. my problem is we didn't know what type of camera it fits.
		the markings on the teleconverter are as follows.
	www.acecam.com /photography/2977.html (97 words)

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