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Mine Exploration Forum

Author Same Camera - different colour
Peter Burgess

Joined: 01/07/2008
Location: Merstham. Or is it Godstone ...... ?

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Same Camera - different colour
Posted: 09/02/2009 16:58:47
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Here's a question for the photographic techies.

The two photos below were taken with the same camera.

The first is a simple "flash on camera"

The second, taken in the same quarry with the same geology, was taken using a couple of ancient flash guns.

Why is the colour so very different between the two photos? I don't think it's due to over-exposure, as the second one is actually a bit under-exposed I think. Is it something to do with the colour "temperature" of the flashes or something? In reality, I think the true colour of the rock lies somewhere between the two.







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Hey, who turned out the lights!
IP: 81.144.191.248 Edited: 09/02/2009 17:01:11 by Peter Burgess
pacef8

Joined: 20/12/2008

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Same Camera - different colour
Posted: 09/02/2009 19:37:18
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well i think you answered your own question there.

what you could do i photo a white sheet of paper it doesnt need to be focused just the correct exposure with maybe a small circle drawn in the middle. do the same for the flash and compare the two next to each other. i bet the flash one is more blue. or tungsten as we call it. you could put a piece of ladies stocking over the flash to knock it back and diffuse the hard edges that flash gives.

I dont think most people like to use flash as it doesnt give a natural light effect which i think is what you are looking for.

non of the below where taken with a flash but you will need a tripod as they are about 30 seconds and i used two torches.

http://www.flickr.com/photos/pacef8/

hope that helps
pace
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SimonRL

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Joined: 27/11/2005
Location: North Wales

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Same Camera - different colour
Posted: 09/02/2009 19:46:05
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I would imagine it'll be the colour / warmth of the flash (I'm not a pro by any means, barely an ameteur so don't take this as gospel!) and it might also be related to the camera being on auto white balance.

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Peter Burgess

Joined: 01/07/2008
Location: Merstham. Or is it Godstone ...... ?

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Same Camera - different colour
Posted: 09/02/2009 20:03:20
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So the flash on the camera is a substantially different colour to the old guns I have? Why would that be? All the photos I used to take with my faithful old SLR using those guns looked fine colourwise. Is flash technology so different now? I haven't changed any of the settings on the camera, such as "auto white balance". Maybe that's worth some experiments. When I looked at my photos I wondered for a moment whether I had taken them all in B+W mode! The fluorescent tape in one of the other shots seems to look right though.

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SimplyExploring

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Joined: 29/04/2007

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Same Camera - different colour
Posted: 09/02/2009 20:23:00
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I would go with what Simon said "Auto White Balance"

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Peter Burgess

Joined: 01/07/2008
Location: Merstham. Or is it Godstone ...... ?

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Same Camera - different colour
Posted: 09/02/2009 20:25:51
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Cheers everyone. That should be a simple thing to experiment with next weekend. I'll post up the results! Thumbs Up

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pacef8

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Same Camera - different colour
Posted: 09/02/2009 20:27:34
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dont forget your old film will be calibrated for midday californian sunshine, you used to be able to buy tungsten specific film if you where only doing flash, but know one ever did.

Yes your dslr flash is probable a different colour temperature to the flash guns.

However i would ditch using the one on the camera anyway. its just going to use up your batteries .


pace
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Peter Burgess

Joined: 01/07/2008
Location: Merstham. Or is it Godstone ...... ?

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Same Camera - different colour
Posted: 09/02/2009 20:28:35
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[ light bulb moment ]

If I am using flash on camera, the internals of the camera would know I am doing this, and possibly compensate for the colour of the flash? As the washed out photos are taken without camera flash on, it is probably adjusting its own setting wrongly? Looks like an interesting trip coming up! Good grief! I'm turning into a photography anorak! Help ! Laugh

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IP: 92.2.23.145 Edited: 09/02/2009 20:29:23 by Peter Burgess
Peter Burgess

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Location: Merstham. Or is it Godstone ...... ?

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Same Camera - different colour
Posted: 09/02/2009 20:30:59
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pacef8 wrote:

dont forget your old film will be calibrated for midday californian sunshine, you used to be able to buy tungsten specific film if you where only doing flash, but know one ever did.

Yes your dslr flash is probable a different colour temperature to the flash guns.

However i would ditch using the one on the camera anyway. its just going to use up your batteries .


pace


I need a new battery pack anyway. One trip used up all the power in two packs, without using the flash once!

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pacef8

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Same Camera - different colour
Posted: 09/02/2009 20:35:50
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yeh you probable are but i do it for a living salvaging peoples wrongly exposed exposures so i have an excuse.

i think now that it is your kelvin white balance temperature setting

eek !!!!


where talking colour temp if we have lost anyone here.

cold led=blue
flouresent tubes=green
sodeum street=orange


Sleeping
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Wormster

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Joined: 15/08/2006
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Same Camera - different colour
Posted: 09/02/2009 20:39:43
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Peter,

Are any of your M/E mates smokers?? if so find one who rolls his own and nick a few rizlas off him, bung one over the onboard flash - it'll act as a kind of diffuser giving a softer light.

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Peter Burgess

Joined: 01/07/2008
Location: Merstham. Or is it Godstone ...... ?

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Same Camera - different colour
Posted: 09/02/2009 20:42:50
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Wormster wrote:

Peter,

Are any of your M/E mates smokers?? if so find one who rolls his own and nick a few rizlas off him, bung one over the onboard flash - it'll act as a kind of diffuser giving a softer light.

No, but I was offered a white carrier bag at the weekend. It tasted disgusting. Good suggestion - I think I'll need all day not just an afternoon to try all this stuff!

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pacef8

Joined: 20/12/2008

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Same Camera - different colour
Posted: 09/02/2009 21:04:06
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peter
are any of your mates pole dancers, ask for a stocking 2o denier light brown late thirties max, this will also be warmer and diffuse the flash colour.
Alternately take the flash and camera to the bar first !! Thumbs Up
IP: 86.166.71.99
Peter Burgess

Joined: 01/07/2008
Location: Merstham. Or is it Godstone ...... ?

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Same Camera - different colour
Posted: 09/02/2009 21:13:59
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The only dancers I know are Hungarian. Confused

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Peter Burgess

Joined: 01/07/2008
Location: Merstham. Or is it Godstone ...... ?

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Same Camera - different colour
Posted: 15/02/2009 22:50:29
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Four photos from today's trip uploaded - a few more to follow tomorrow perhaps. (See Chaldon Firestone Quarries User Album). Fiddling with the white balance setting has certainly produced a better colour. Of the various options, the "Daylight" setting seems the most true to life.

Here's one:



(click image to open full size image in new window)

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Hey, who turned out the lights!
IP: 92.2.125.24 Edited: 15/02/2009 22:55:35 by Peter Burgess
Gwyn

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Joined: 23/10/2007
Location: Bethesda.

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Same Camera - different colour
Posted: 16/02/2009 12:26:51
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A fascinating collection of pictures. Thanks, Peter. Thumbs Up IP: 92.3.14.42
owdsnuffy

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Joined: 15/06/2007
Location: lancashire

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Same Camera - different colour
Posted: 16/02/2009 20:09:26
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I would suspect that daylight setting for WB would be best as the colour temp of flashguns should be the same as the sun at midday. Glad that you are happy with your settings!! Have fun Big Grin IP: 81.102.168.126
Peter Burgess

Joined: 01/07/2008
Location: Merstham. Or is it Godstone ...... ?

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Same Camera - different colour
Posted: 16/02/2009 22:02:42
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The rest of the photos uploaded now. We are planning a third trip even deeper into the workings - no date set as yet.

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PeteHall

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Joined: 31/08/2008
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Same Camera - different colour
Posted: 10/03/2009 17:46:40
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Just had a play lighting some photos with my carbide lamp, the difference in colour is quite impressive...

With LED lighting:


(click image to open full size image in new window)

With flash guns:


(click image to open full size image in new window)

With carbide lighting:


(click image to open full size image in new window)

Although the light output isn't so good, it makes a nice change from all the blue looking photos that I seem to take... Smile

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