Dptips :. Digital Photography Tips, Tricks, and Techniques

A common answer on most message boards:

http://photonotes.org/articles/eos-flash/

ttp://photography-on-the.net/forum/showthread.php?t=46599

Those two links should cover just about every EOS flash topic.? Happy Reading.

Sunny 16 is an approximation for ambient light exposure and is
unrelated to flash coverage. Flash coverage/distance is not affected by
levels of ambient lighting, only distance(inverse square law) and flash
Guide Number(power).

Distance = GN / f stop at ISO 100

at ISO 200 multiply by 1.4

at ISO 400 multiply by 2

So on a sunny day, the max distance of a 550EX, using f/16, is about 4 Meters at ISO 100.

Flash fill indicates that you are using ambient light as your
primary light source and flash to just fill in some shadows under the
eyes, etc. That means you should also be dialing in -FEC to the tune of
-1 to -1 and 2/3 as long as you stay within that max distance. Outside
that distance the flash will be maxing out and may give erratic
results.

Ron

Sure can.? Its cheap and relatively easy to do!? http://forums.dpreview.com/forums/read.asp?forum=1027&message=6038636

Ivan

The flash trigger voltage is the internal voltage used inside the strobe/flash to trigger it’s circuit. To activate a flash the circuit needs to be closed (turned on) and the flash trigger voltage needs to flow thru the switch. Simple right? Yes, but what is usually the trigger? Well […]

Here is the site you need to go to: http://www.botzilla.com/photo/strobeVolts.html

The Battery Shootout:

http://www.imaging-resource.com/ACCS/BATTS/BATTS.HTM

Fill flash is often used when the subject of a photograph is in front
of a bright background, or a background with details that would
normally be lost with a standard flash mode.

Fill flash is a general term; it can mean different things to
different people, but almost always shares the common idea that it
simply bumps up the light values on the subject just enough to expose
the subject properly, without under exposing the background.

There are MANY ways that photographers achieve this. One thing to
remember is that your overall exposure should remain the same or very
close to the naturally occuring light. Your flash exposure should be
slightly lower than the ambient light (naturally occuring light). This
adds just a little bit of flash that only the trained eye can see
therefore making the photo better balanced with light and just
generally more dynamic.
dslro

1. Open that image in photoshop.

2. Open the second image, go select all, copy the photo

3. Switch back to the original image, (control-shift-tab), and paste the 2nd photo on top of the first

4. Select all again, and then go to layer, layer mask, reveal all.

5. Set your color selections to black on top, and white […]

Tricking AI servo, three ways I know… (works in ANY mode):
1. Achieve focus lock on a subject and then whilst keeping the shutter half depressed and the subject centered, move the lens focus ring - camera drops into AI servo and will stay there as long as the shutter is kept half depressed. (Only works […]

Use a DOF calculator: http://www.dofmaster.com/

In most cases your lens will come with a DOF chart that you can refer to.
Ivan

Here is everything you need to learn about it:
Write-up at Luminous Landscape
Ivan

Well, if I can give you one bit of advice, it’s that you should never use the ‘Sharpen filter’

It’s not controllable and isn’t generally ’smart’ on what it sharpens.
Learning how to build edge masks is not that difficult, but takes a lot
of explaining so you’re better to read something like this:
http://www.luminous-landscape.com/tutorials/smart_sharp.shtml
And this is an excellent […]

Focus Test Links:
http://md.co.za/d70/chart.html

http://www.photo.net/learn/focustest/

Ivan

Curious how long your camera is going to last.? Here is a rough estimate based on actuations:
300d - 350d? ~ 30,000+
20d ~ 50,000+
1d Mk2 ~ 250,000

Ivan

http://consumer.usa.canon.com/ir/controller?act=SupportDetailAct&fcategoryid=215&modelid=10464
Click on "Product / Software Manuals", then download in whatever language you want.
Ivan

A very interesting side by side comparison of the 350D/XT and a modified 300D:
http://www.camerahacker.com/Canon/DRebel_Comparison.shtml

Derek

If you own a Canon 70-200mm f/4L, 300mm f/4L or 400mm f/5.6L
lens, you don’t have to spend $120 for the white tripod ring (Canon
Part: # 2889A002, "Canon Tripod Mount Ring A"). Instead, buy the black
version (Canon Part #: 2888A002, "Tripod Mounting Ring A for 200mm f/2.8L II").
This part is identical to the white version (targeted […]

The quickest and most used way according to forum users is to "format" the card in camera.??
Ivan

BrianP on Dpreview posted this:
If you need the speed, I would go for:
35 f/1.4 (if it is wide enough for you)
24 f/1.4 (if the 35 wasn’t wide enough)
If either speed doesn’t matter as much or you are on a tripod shooting landscape:
TS-E 24 f/3.5L (this is somewhat softer than the 35 above, but The Tilt […]

Jim on Dpreview posted this interesting tidbit on it:

Rechargeable Lithium Ion (Li-ion) is relatively newer battery
chemistry. Li-ion batteries are popular because they contain a higher
energy density that almost any other type of battery chemistry. When
properly designed, manufactured, and used, Li-ion batteries have an
excellent track record. Unfortunately if improperly designed,
manufactured or used, and because of their […]