I Dare You!

by peter_budo

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5

Most calibration is done by comparing a device under test to one that's known good or by using a calibrated reference source. Many metrology labs offer this as a service, usually in ways that can be traced back to NIST or another standards organization. The cost will be many times the value of your Weston meter. The zero point adjustment on your meter ...


5

Based on my experience (in part based on what I learned from asking Are small on-flash softboxes useful, or a gimmick? a few years ago), an 8x9" softbox is really going to be too small to be generally useful for portraits. You can use it for headshots, if you get in tight and have it just out of frame, but it's not very versatile otherwise — at least not as ...


4

There is no infrared wavelength that does not appear in sunlight. You would have to apply a filter to the sunlight, and to any ambient incandescent lighting, to be able to restrict the image to whatever is illuminated by your specific IR source. Note also that most consumer digital cameras have infrared filters in front of the sensor. However they still ...


2

The easiest way to get an image that looks straight on is to photograph it from as high as possible using a longer focal length, this greatly reduces the effect of not being quite parallel, and prevents objects in the corners from appearing to bulge outwards. I usually use a tripod set to maximum height and a 100mm lens and shoot through the legs. If you ...


2

No. It will not work as a master off-camera. None of the Canon flashes can be used simultaneously as a slave and a master. The 90EX is only a master unit if used on the hotshoe, or tethered off-camera with a TTL cable. If used on manual-only radio triggers, there's no way for it to sense it should perform master communication. And TTL radio triggers act ...


2

The application/apparatus described in the question is similar the method used by the Microsoft Kinect(tm) camera system. Kinect employs a timed IR dot pattern projected from the device and a high speed IR camera to pick up where each dot lands. A processor uses simple trigonometry to create a depth map which can then be applied to the RGB image from ...


2

It's not impossible, just unnecessarily difficult. We're not shooting slide film in 8x10 view cameras anymore; we live in a digital world. Getting the glitter, or at least one part of the glitter at a time, is relatively easy with a small light source. Getting the overall picture of the product is pretty easy as well, as these things go. If you're on a ...


2

This is basically the exact opposite of the traditional white-background portrait, as described at How can I get a pure white background in studio photography?, or a modification of What do I need to get photos with a unifom black background? Once you understand those, this is relatively easy. Raphael explains one possible model, but I think it's actually ...


1

I'd first set my exposure for the background. Next, I'd set up the flash off camera and close to the subject for over exposure. The important part is the flash is flagged or snooted so you can direct the light to fall on the subject without affecting the background. Having the background or anything that can reflect light back a good distance away from the ...


1

In just my opinion: 1) The ambient looks like it is very dark; the clouds looks blurry. 2) Overexpose the flash probably 2 steps. If you can not overexpose more than 2 steps you would need an external one. 3) Shoot the persons and they need to move fast from the place after the flash. 4) I think the ambient is very low light because you can't see trails ...


1

You can use a set of Yongnuo YN-622C triggers to maintain most E-TTL functionality when your 430EX is off camera. Each YN-622C unit is able to act as either a transmitter or a receiver. I prefer to use the YN-622C-TX on camera as it has an LCD that makes setup and changing settings much easier. The YN-622C-TX is a transmitter only. You would then need only ...


1

Personally I would not choose a 50mm lens for this but a higher focal distance. 100-200, but depends on the art size. The more focal leinght you have less distortion you get. But as it is a prime lens, it is a good option. If you get noticeble distortion you can correct it on postproduction. FStop The lenses have an optimum performance in the mid range, ...


1

If you're really on a tight budget you could do a lot worse than to pick up a cheap off-camera extension cable from a popular auction site, they're dirt-cheap and a good place to start in the world of strobism. Otherwise, if you want to go wireless you have a number of options. Definitely go for wireless rather than infrared, wireless has better range, ...


1

Yes, using a 90EX as a master unit to trigger the 430EX II is exactly a use case that it was designed for. Keep in mind that this is an optical connection and it's not all that reliable or far reaching. For much more detail and additional non-optical options take a look at this previous question: How can I fire a single canon 430ex flash remotely from a ...



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