Using A Flash


alfiemooon

Link Posted 26/09/2009 - 15:51
Watching P3 & Qualifying of the Singapore GP I see so many camera flashes going off.
Are they really that effective in those conditions?.

Nic
K10D,K20D
Pentax 18-55,Tamron AF 70-300,Sigma 150-500
Kenko 2X Teleplus MC7
AF 360 FGZ

George Lazarette

Link Posted 26/09/2009 - 16:07
No, of course not. But stupid manufacturers make them go off by default, and often you can't save a change to the default.

G
Keywords: Charming, polite, and generally agreeable.

gartmore

Link Posted 26/09/2009 - 16:11
They give very effective overexposed, out of focus heads in foreground if you like that sort of thing.
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -

alfiemooon

Link Posted 26/09/2009 - 19:37
Hmmm,maybe it`s a "my camera`s better than your`s" thing then.

Nic
K10D,K20D
Pentax 18-55,Tamron AF 70-300,Sigma 150-500
Kenko 2X Teleplus MC7
AF 360 FGZ
Last Edited by alfiemooon on 26/09/2009 - 19:38

Oggy

Link Posted 26/09/2009 - 21:05
alfiemooon wrote:
Hmmm,maybe it`s a "my camera`s better than your`s" thing then.

Nic

That was what I thought when I saw at least two cameras with flashes mounted and long lenses at Shoreham Airshow.

alfiemooon

Link Posted 27/09/2009 - 00:56
So it wasn`t my eyes,I saw the same at RIAT this year.
Mind you,she who is to be obeyed found it funny and quite pathetic when portly men in waxed jackets,usually a floppy hat to match,depressed their shutter/AF button to operate their telephoto lenses as they walked past her...luckily she`s not easily offended,infact we had a short discussion to determine whether this was a "Mating Ritual"

Nic
K10D,K20D
Pentax 18-55,Tamron AF 70-300,Sigma 150-500
Kenko 2X Teleplus MC7
AF 360 FGZ

Bob and his Pentax

Link Posted 28/09/2009 - 16:48
alfiemooon wrote:
Watching P3 & Qualifying of the Singapore GP I see so many camera flashes going off.
Are they really that effective in those conditions?.

Nic

Most of those flashes will come from point and shoot cameras and will be a waste of time.

But if you think about it if you fit a AF540FGZ to a K7 set at ISO 1600 fitted with a DA*60-250 then your giude number is 216 divide that by the maximum lens aperture of 4 and your flash is good to go for up to 54 meters. (OK there may be some fall off that needs to be allowed for by trial and error).

So the real answer to the "were they wasting their time" question is that it depends what kit they were using.
Good luck

Bob

Pentax user since 1978, Digital since 1997.
Kit includes: K-7, K20D, K10D, *istDS, full set DA* lens, etc

Helpful

alfiemooon

Link Posted 28/09/2009 - 20:34
It has been reported that normal sodium street lighting cancels out the headlight beam from a motor vehicle but ok Bob,hear what you`re saying,didn`t realise there was so much maths in photography,neither did I know that a good gun had that much reach.I`ve got so much to learn...hmmm...wonder where my AF 360 FGZ falls in the Flash Gun scale?

What did Martin Brundle say during the race,four times as much light as at a Football Stadium,primarily for the Tv cameras.

Nic
K10D,K20D
Pentax 18-55,Tamron AF 70-300,Sigma 150-500
Kenko 2X Teleplus MC7
AF 360 FGZ

fatspider

Link Posted 28/09/2009 - 20:37
I remember the solar eclipse we had several years ago, and I remember people taking pictures of it using compacts with the flash popped up
My Names Alan, and I'm a lensaholic.
My PPG link
My Flckr link

womble

Link Posted 28/09/2009 - 22:13
Ever seen the London Eye at night? Flashes going off all over. How many happy snaps of one's beloved standing in front of a black window with a burnt out patch of flare are there in the world, I wonder?
Kris Lockyear
It is an illusion that photos are made with the camera… they are made with the eye, heart and head. Henri Cartier-Bresson
Lots of film bodies, a couple of digital ones, too many lenses (mainly older glass) and a Horseman LE 5x4.

My website

alfiemooon

Link Posted 28/09/2009 - 22:23
impotentspider wrote:
I remember the solar eclipse we had several years ago, and I remember people taking pictures of it using compacts with the flash popped up

I remember watching the tv program with Sir Patrick Moore and a plane full of "star spotters",how many times did he have to tell people to turn the flash off

womble wrote:
Ever seen the London Eye at night? Flashes going off all over. How many happy snaps of one's beloved standing in front of a black window with a burnt out patch of flare are there in the world, I wonder?

I was at Longleat a few years ago.We took the bus around the game reserve (a very good idea for anyone thinking of going).There was a woman using her flash,I suggested that she turned it off and she looked at me as though I was nuts...I don`t think she knows my therapist...ha ha ha

Nic
K10D,K20D
Pentax 18-55,Tamron AF 70-300,Sigma 150-500
Kenko 2X Teleplus MC7
AF 360 FGZ

Pwynnej

Link Posted 29/09/2009 - 10:13
I was at Goodwood last weekend and there was this beardy ZZ-top guy with an arsenal of Canon pro gear and a rather tasty-looking assistant/wife/girlfriend/daughter.

He was using a speedlight on his 1D Mk2 with a 100-400 L lens on something that was about 50 odd yards away.

In sunshine

My GF and I just looked at each other with raised eyebrows
Z-1p, K-1, P50
F50 1.7,FAs 24, 31,35/2, 50 1.4, 77, 85, 135. DFA15-30, DFA24-70, D-FA*70-200. D-FA 100. DA*300. TC 1.4.
Metz 45 CL-4, AF500FTZ. AF540FGZ.
Some Mamiya and some Nikon

ChrisA

Link Posted 29/09/2009 - 13:57
impotentspider wrote:
I remember the solar eclipse we had several years ago, and I remember people taking pictures of it using compacts with the flash popped up

From the air, this sight was quite striking.

I'd been airborne at the time, hoping to see both totality, and the moon's shadow rushing across the ground. Sadly, I missed both, due to a very annoying thin layer of cloud at about 8000 feet.

However, in the darkness below, for the whole of totality, there was a constant twinkling from the flashes going off.

Not really compensation for being in the wrong place, but it was quite pretty.
.
Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
.

fatspider

Link Posted 29/09/2009 - 14:54
Quote:
I missed both, due to a very annoying thin layer of cloud at about 8000 feet.

I know exactly what you were feeling Chris, we had traveled to Folkstone to see the eclipse at its best, all we got was 100% total cloud cover, there I was, along with several others, cameras on tripods long lenses and teleconverters at the ready and about to miss the event of a lifetime, it made me realise just how small and insignificant I was. So we just sat and waited for it to get dark

PS; does anyone want to buy an eclipse filter
My Names Alan, and I'm a lensaholic.
My PPG link
My Flckr link

Bob and his Pentax

Link Posted 30/09/2009 - 16:22
alfiemooon wrote:
...hmmm...wonder where my AF 360 FGZ falls in the Flash Gun scale?

If you use your AF360FGZ in PTTL mode then guide number is variable. But for manual mode with full discharge

ISO Guide number (for metric)
100 36
200 50
400 72
800 100
1600 144

distance = guide number / lens aperture

so if you use f4
ISO distance (meters)
100 9
200 13.5
400 18
800 25
1600 48

In manual mode your flash gun will have a scale in the window which will give you the max usable distance.

In reverse. If object is at 15 meters ISO is 400 so GN = 72 aperture to use is 72/15 which is about f5.

The realy good thing about PTTL is that you can just up the ISO to use flash further away an the automodes look after the rest with out you having to do the maths(provided that in Av you have given it a large enough aperture). But if I was doing such 'extreeme' use of the flashgun then I would use manual and do the maths.
Good luck

Bob

Pentax user since 1978, Digital since 1997.
Kit includes: K-7, K20D, K10D, *istDS, full set DA* lens, etc

Helpful
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