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Frequently Asked Questions

What lens and ring flash do you recommend for use with the Canon 10D and Digital Rebel?

Digital Dentistry Frequently Asked Questions- Dr. Thomas K. ...
The lens is a 100 mm Macro (around $600) and the ring flash is a MR-14EX (around $499). You can also use a Sigma 105 mm Macro lens (around $359). Can't go wrong with Canon paper. I like Glossy. If I was sending a before and after to a referring doctor, I would print 8.5 x 11. I would arrange the images and text in Photoshop Elements and print in Landscape orientation.
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Is there a way to use a ring flash with my digital camera?

Digital Photography FAQ
Probably, but depending upon your camera's support for standard external flashes, it may require some persistence and some workarounds:
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Why do you recommend the Canon EOS Rebel 2000?

FAQ - Ask the Expert
Two reasons mainly: 1. The Rebel weighs only 13 oz (368.54 grams) with film, batteries and 28-80 zoom lens. 2. The camera quality at this price point is astonishing. The lower the weight, the more control you have and the less movement. Other 35 mm cameras may be used as long as they have auto wind and electric shutter release. We can custom configure for other types of cameras. Canon has come out with a 6+ Digital Camera on the Rebel body. Both cameras can be used on the same aerial system.
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Why is exposure with my Canon flash system so unpredictable?

Digital Photography FAQ
Recent Canon SLRs use a system called E-TTL to determine flash exposure. (Newer models use E-TTL II, which seems to be more robust.) E-TTL is praised by some for allowing very precise control over flash exposure when used properly, but it is slammed by others for being too sensitive to very small changes in the center of the image and requiring too much planning to get proper "automatic" exposure. There is probably some truth in both positions.
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Why can't I use a ring flash on my point-and-shoot digital camera?

PhotoMed Cameras
Several companies are offering point-and-shoot digital cameras with ring flashes and calling them digital dental cameras. These cameras do not function well because the camera has no way of controlling the amount of light the flash puts out. Every time you take a photograph, the amount of light necessary for a proper exposure is slightly different.
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Can I use the Canon 100mm macro lens for portraits?

Canon EOS Beginners' FAQ III - Lenses
Absolutely. The 100mm 2.8 macro and macro USM lenses are both excellent portrait lenses in addition to being great macro lenses. The only problem is that they’re extremely sharp lenses, and some people prefer softer lenses for portraiture, particularly of women. If you’re in that camp you could always slap a soft focus filter onto the lens.
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I have a Nikon or Canon SLR kit lens. Can I use the filter?

M A G I C - F I L T E R S
Yes! Many of you will have got these lenses with your DSLR and will want to put them to use underwater. Both the Canon 17-85mm and Nikon 18-70mm will work well with the filter. However neither are really excellent quality lenses for UW photography and therefore we do not supply 67mm diameter filters pre cut to fit these lenses. Your will need to buy a M77 for these lenses. And then either mount it in a 77mm filter holder (that we can suppy) and fit it to your lens with a step-up filter ring.
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Can I use a non-Canon, non-dedicated flash with my EOS camera?

Canon EOS FAQ 2.4 - Flash
Before using any unfamiliar studio strobe or other non-dedicated flash unit with an EOS camera, we STRONGLY recommend that you determine its trigger circuit voltage. Excessive trigger circuit voltage can damage the shutter units and X-contacts of most modern 35mm SLR cameras. Please be aware of the following information: Trigger Circuit Voltage: The "trigger circuit" is the part of any electronic flash that detects the X-sync signal from the camera and then fires the flash.
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Why doesn't Canon use distance information for flash exposure calculations?

Canon EOS FAQ 2.4 - Flash
Distance info is only useful so that the camera can apply the "guide number" formula: f-stop = GN/distance. This is only a rough approximation. Off-The-Film (OTF) metering measures the true exposure of the film, which is much more accurate than the guide number calculations. In A-TTL, Canon uses a preflash to actively judge the effective flash-to-subject distance rather than passively.
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Can I use my Canon EOS lenses on the SD10 digital camera?

Sigma - Frequently Asked Questions
The Sigma SD10 uses Sigma's exclusive SA lens mount, the same as used on Sigma's 35mm SLR cameras. There is a full array of lenses available, from 8mm Circular Fisheye to 800mm APO telephoto, including three 1:1 macro lenses; and zoom lenses from 10-20mm to 300-800mm. By the way the SD10 features a stainless steel camera mount , and all lenses for it feature metal lens mount.
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Question: -- What is a Barlow lens and how do I use it?

Telescopes FAQ - How to Setup & Use a Telescope
Answer: -- A Barlow lens is a lens that you use with your eyepiece. A Barlow lens will double (2x Barlow) or even triple (3x Barlow) the magnification of any eyepiece that you attach to it. To use a Barlow lens, remove the eyepiece from the focuser, insert the Barlow and then insert the eyepiece into the Barlow. Remember, though, that a Barlow is best used with low magnification (long focal length) eyepieces.
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I have an old flash unit. Will it work on my new Canon digital EOS camera?

Flash Photography with Canon EOS Cameras - Part I.
Canon digital cameras can only use Canon Speedlite flash models with names ending in EX. If your Canon flash unit has a model name which ends with E or EZ or anything else then it will not work with any Canon digital EOS camera. for flash units manufactured by other makers, check its specifications to see if it supports “E-TTL flash metering.” If it does not, or only lists “Canon TTL flash metering” then it most likely will not work.
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What size of flash memory card do you recommend me using with my PENTAX digital camera?

Pentax Imaging - Digital Camera FAQ
The answer depends on your personal needs and your budget. Memory cards are available in many sizes 8MB, 16MB, 32MB, 64MB, 128MB, 256MB and 512MB. The larger the card size, the more storage space and the greater the cost. One recommendation is to select a card that allows you to take images without having to worry about changing cards or downloading images very often (one of the advantages of digital photography). Among the most popular are those in 64MB, 128MB or 256MB sizes.
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Q So there is a focus ring as well on the lens?

Sony HDR-FX1 FAQ
A Yes, the manual focus is a separate ring on the lens barrel. It also is non-perpetual. There also is a focus switch which can command infinity focus or switch between manual and auto.
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Where do I get the ring? How do I use it?

Sexual & Reproductive Health: Frequently Asked Questions...
The ring is only available with a prescription from a doctor. Store the ring at room temperature for up to 4 months. You insert the ring into your vagina yourself and it is held in place by the walls of the vagina. When you first start using the ring you can insert it any time between day 1 and 5 of your period ? day 1 is the day you start bleeding. The first month use an extra method of birth control such as a condom for the first 7days.
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How do I use a flash gun or studio flash with a leaf shutter lens on my Pentax medium format camera?

Photo - Sales - PENTAX U.K. Limited
For manual (Not FTZ) series of Flash Guns, you will need a 4P Synchro Cord C [37343] which will connect from the x-sync on the lens to flash gun.
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Can I use the built-in flash and an external flash simultaneously?

Evolt E-300 Digital SLR Camera > Frequently Asked Question...
The FL-50 flash can be connected with the E-300 camera through flash power grip: FP-1 and flash cable: FL-CB05. Only Auto and Manual mode can be set in the concurrent use of FL-40 and the built-in flash. (For their specification design, E-300 and FL-40 can not communicate in TTL Auto and R-TTL Auto modes.)
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What is Flash and do you recommend using Flash?

Frequently Asked Questions - Vancouver Web Design
Flash is a vector graphic and animation program. Flash poses the ability to be browser independent.The benefit of Flash is the files are small and practical for low-speed modem connections and yet look like real-time video. Flash has its advantages and disadvantages. If one of your concerns is that your website is search engine friendly then we would not recommend Flash. Other wise there are no other problems with Flash.
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What defines a "digital lens"?

Characteristics of a "digital lens"
There is no real agreement among lens makers and digital camera users as to what constitutes a "digital lens". A "digital lens" could be described as a lens with one or more of these characteristics: long "throw" (strong retrofocus or telecentric design), reduced coverage circle, reduced chromatic aberration, or increased resolution.
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Can I use the Acoustic Lens with other manufacturers' preamps?

Trance Audio - Frequently Asked Questions
The Acoustic Lens poses a unique set of problems to amplify. It produces a very low output level and requires a very high input impedance to accurately reproduce a signal. Other commercially available preamplifiers, even the so-called "Piezo" types are designed to work with the output of a saddle-type or contact transducer, which put out a signal level typically 10 times higher than the Lens.
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What is a Canon L-series lens and why is it a big deal?

Canon EOS Beginners' FAQ III - Lenses
Canon sell a number of lenses in a special series they refer to as L for “luxury.” These are their most expensive and highest-quality lenses, and are readily identifiable by the red stripe painted around the end of the barrel. L series lenses offer higher optical quality than their non-L equivalents, and have an important technical aspect in common.
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Should I buy a non-Canon (third party) lens?

Canon EOS Beginners' FAQ III - Lenses
Despite Canon’s vigorous advertising campaign against third-party lenses a lot of people happily use lenses made by Tamron, Tokina and Sigma (and lenses with other brandnames but probably built by one of those three). And there’s one really good reason for this - the third party lenses are almost always much much cheaper than equivalent offerings from Canon. So. Should you buy a third party lens? It’s not a simple yes/no issue, so here are some points to consider.
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Will my Canon lens cap fit on the end of the LensMate Adapter?

LensMateOnline - F A Q
No. For the G1/G2, the Canon lens cap is a nonstandard size designed to fit the trim ring (that you remove when attaching any adapter) at the base of the lens only. With the LensMate adapter on, any standard 49mm snap-in, screw-on or slide-on lens cap will fit. For the G3/G5, you may choose from many standard 52mm or 58mm caps (depending on which size G3/G5 adapter you are using) including the "clip-in" type we sell.
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How can I adjust the focus and zoom on my broadcast Canon or Fujinon lens?

FAQ
this time there are presently not any wireless LANC controllers available that we know of (other than the short range controller that comes with the camera). However, we currently have one under development. It will be added to our list of options as soon as it's available. SAFETY IS OF UTMOST IMPORTANCE! We have, in our instruction booklet, guidelines, directions, and engineered drawings for permanent cable installation, including cable tensioning instructions.
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What's the best upgrade for a Canon EF-S 18-55mm kit lens?

Lens Test Archive and Reviews
What are you looking to upgrade? If you need IS, get the 17-55mm f2.8. If you can't afford the 17-55, and you really, really need IS – and you're not that unhappy with the resolution of the kit lens – get the Canon 17-85mm IS, but know this: it is considerably softer, and up to two stops slower, than the excellent Tamron 17-50mm f2.8. the time of writing, there is no Canon equivalent of the excellent VR (image stabilised) long Nikon zooms.
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What is Canon?

H?rnList & H?rnForum - H?rn Frequently Asked Questions (H?rn...
Canon" refers to the body of H?rn material, including both H?rnmaster rules and H?rnworld environment, that has been officially published by CGI or Kelestia. The term is used to distinguish such material from fan-produced material (sometimes called "fanon").
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Total Ministry FAQ
Canon 9 is part of our national church law that provides for the ordination of local deacons and priests who are ordained and licensed to serve only in their own community. The details of Canon 9 may be found at Episcopal Church Canon 9
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Why do you use Canon equipment?

SWIFT SHOT :: Professional Sports Photography | frequently a...
Canon has continued to lead the industry with advances in Professional Digital Photography, and continues to innovate at a very fast pace. We owe it to our customers to stay on the leading edge of technology in this emerging field.
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But the Superkick was played after a 5D Maneuver. Why doesn't it do 10D?

Raw Deal FAQ: Complete
Not really: it was played after the Stagger. The intent of any card that says it must be played after a certain card or a card can only be played if another was played before, means that the card in question must have been played immediately after or immediately before. Using the above example, Superkick does an extra 5D if played after a maneuver that did 5D or greater.
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What camera do you use to take your photos? and what digital cameras would you recommend?

Twisted Rails
All photos taken before October, 2000 were taken with either a Fuji MX-1200 or a Fuji Finepix 1400. Both of these cameras are 1.3 Megapixel, resulting in low resoultion pictures. All other pictures were photographed using a Nikon Coolpix 990, a 3.34 megapixel camera. I cannot recommend enough Nikon's digital cameras. They were developed with both the amateur and the professional in mind. If you are looking at purchasing a digicam, decide on the features you want before you start shopping.
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