--
It will fall according to the square law. At twice the distance it will be 1/4th the light. 3x the distance is 1/9th the light (3 stops).
There were no "tests" done, it was stated clearly at the top of the table GUIDE NUMBER which is normalized to f/1.0 at ISO 100. How in the world would you otherwise rate flash distance if every lens has a different f/stop????
What does that matter? It's a standard rating. An engine is rated in horsepower but that doesn't mean you have to be able to put 340 horses in your engine bay????
I see this:
??????
Listen up. I am not going to repeat myself. You're posting a rediculous amount of times to repeat the same question without even reading the post you're responding to.
Read it again, slowly. If you don't understand, read it again.
--
--take a look at this..there is a chart at the bottom that show the
distance reach according to the different shutter speeds.
http://www.usa.canon.com/html/cameras_speedlite/550exspec.html
is there such chart for the Sigma?
------I was able to get a flash at 1/1000sec in Manual mode and the flash
in FP. In the 300D view finder an H appears next to the flash
symble. Looks like this can be done in Tv mode as well but if you
are practicing and it's not bright your aperture will fall to it's
largest setting (widest) and you may not even be able to fire off a
shot. I will be trying this out to flash fill with in-flight birds
and the better beamer.
Here is a picture I took this last weekend of Arthur Morris with
this setup. They were standing there waiting for birds to fly into
the rookery. Only difference is a better camera/flash and a custom
flash mount that attaches from the lens (100-400L).
-------
Rod
http://www.pbase.com/rod_ostoski
Minë Corma hostië të ilyë ar mordossë nutië të
Mornórëo Nóressë yassë i Fuini caitar.
Un thoron arart’a s’un hith mal’kemen ioke.
Saurulmaiel
-------
Rod
http://www.pbase.com/rod_ostoski
Minë Corma hostië të ilyë ar mordossë nutië të
Mornórëo Nóressë yassë i Fuini caitar.
Un thoron arart’a s’un hith mal’kemen ioke.
Saurulmaiel
--
--take a look at this..there is a chart at the bottom that show the
distance reach according to the different shutter speeds.
http://www.usa.canon.com/html/cameras_speedlite/550exspec.html
is there such chart for the Sigma?
------I was able to get a flash at 1/1000sec in Manual mode and the flash
in FP. In the 300D view finder an H appears next to the flash
symble. Looks like this can be done in Tv mode as well but if you
are practicing and it's not bright your aperture will fall to it's
largest setting (widest) and you may not even be able to fire off a
shot. I will be trying this out to flash fill with in-flight birds
and the better beamer.
Here is a picture I took this last weekend of Arthur Morris with
this setup. They were standing there waiting for birds to fly into
the rookery. Only difference is a better camera/flash and a custom
flash mount that attaches from the lens (100-400L).
-------
Rod
http://www.pbase.com/rod_ostoski
Minë Corma hostië të ilyë ar mordossë nutië të
Mornórëo Nóressë yassë i Fuini caitar.
Un thoron arart’a s’un hith mal’kemen ioke.
Saurulmaiel
-------
Rod
http://www.pbase.com/rod_ostoski
Minë Corma hostië të ilyë ar mordossë nutië të
Mornórëo Nóressë yassë i Fuini caitar.
Un thoron arart’a s’un hith mal’kemen ioke.
Saurulmaiel
-------
Rod
http://www.pbase.com/rod_ostoski
-------
--I didn't know how to get the shutter speed up at that point so I
was shooting in Av mode and TTL. Good thing the Egret was standing
still! I slid my aperture as wide as it would go trying to blurr
the background as much as possible. I didn't get it as blurred as I
liked but as you know, the distances have lot's to do with it. I
was about 25 feet from this bird, hard to remember the exact
distance. I liked the composition of the picture and didn't want to
zoom in too close.
-------
Rod
http://www.pbase.com/rod_ostoski
-------
I don't know..I am more than flash dumb, I am totaly clueless as to how they work..never used one. I download the manual and reading through it. seems easy enough but I am still puzzle as to how the ISO and F number will affect the flash range with high speed sync.
yes that is what I want to do..so the range for a flash like the 420ex at ISO 100, 1/1000s is only 10 feet, but that is of full flash exposure. That mean that it is strong enough to provide a correct exposure if there is no ambiant light..I am guessing that what is needed for fill in is much less strong, so it might work, should work.
--
--Here is a really good article on Arthur Morris's tips on shooting
birds.
http://www.takegreatpictures.com/articles/default.asp?aid=1337
1/160s f/5.0 at 210.0mm iso200 with Better Beamer
-------
Rod
http://www.pbase.com/rod_ostoski
-------
Actually, I posted so people don't see comments like this:
and get mislead by that because they'd assume a person with 18 thousand posts under their belt must understand this basic concept by now and might take something incorrect away from your post.
No, not a "guide"... a "guide number." These are entirely different items.
Nowhere am I using a figure of speech as an example. Nowhere am I talking about a guideline. A "guide number" is a set in stone physical quantity.
That's great. The exact answer to your question below about the increase in effective range after adding the better beamer is contained there as well.
I don't know why you're giving a link to a term that is irrelevant to this thread, but while you're perusing your site you may want to look up the term guideline that you keep trying to use.
ok that does it! 2-3 stop, more than twice the distance of the flash alone...sounds really good
))--
--
You put the flash in ETTL mode, then it's either the + or - button (can't remember which right now), then you should see a little fast-forward looking symbol on the flash (this means HSS is active) and you should now be able to set a higher shutter speed.
i have the 550 but i can't manage to get the camera shooting faster than 1/200, where is this high speed sync mode? how can i set it?
