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| Water Drop Photography - Tips and Tricks? - Page 2 | |
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| Posted: Wed May 23rd, 2012 14:09 |
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11th Post |
Robert
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moonlight1811 wrote:Exposure? I keep seeing this word pop up in things I read, but I have yet to find out what it really means. Exposure, in different contexts means different things... An exposure, to take an image with the camera. The sensor is like film, it records the image which is focused onto it while it is exposed, while the shutter is open. Exposure duration, the shutter speed, the time the sensor is exposed to the image. Exposure (settings) the combination of shutter speed and aperture. Exposure *Stop*, means one step of the shutter speed, or one full step of the aperture. Exposure Value, or EV is a way of altering the shutter speed up and the aperture down (or wider) both move by one stop each normally so for example 1/500 Sec at f8 is the same EV as 1/1000 Sec at f5.6 or 1/2000 at f4 or going the other way 1/250 Sec at f11. I know next to nothing about music but the sounds of instruments double or halve in frequency with each sound value? with light it's much the same, I think? Not sure if that helps... The reason for EV's is so you can open or close the aperture to get the depth of focus you want OR increase or reduce the shutter speed to get the exact speed effect you want, like blurring the spokes of a wheel to show movement or the propellor of an aircraft, to show movement, etc while retaining the same exposure value. The exposure varies with the light. More light, needs less the exposure. Poor light may mean raising the ISO setting on the camera because the sensor just can't produce an image. BUT raising the ISO too much can cause what we call noise, this is electronic noise when the light isn't sufficient to produce an image the sensor tries to amplify the signal and that can cause noise in the form of gritty dots of multi colours. Not very nice.
____________________ Robert. |
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| Posted: Wed May 23rd, 2012 21:48 |
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12th Post |
moonlight1811
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Robert wrote: Exposure, in different contexts means different things... Well, you've stumped me a little. I think I understand, but then I read your explanation again and then I realize that I don't understand. lol I'll get it eventually! I'm determined!
____________________ -Melissa |
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| Posted: Thu May 24th, 2012 00:43 |
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13th Post |
Robert
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It will all fall into place, once you become familiar with the terminology, it's harder to explain than it really is. Too many things to learn at once. Go take some more pix! That's what really matters. Put some on here and we will help you progress.
____________________ Robert. |
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| Posted: Thu May 24th, 2012 02:31 |
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14th Post |
Robert
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Been having a bit of a think about this 'Exposure' thing. The image you posted of the water droplet while well executed and very clever, wasn't well exposed it's dull and lacks sparkle. You mentioned iPhoto... So I imported your image into iPhoto on my MBP, which gave me this: Attachment: Screen Shot 2012-05-24 at 08.18.35.png (Downloaded 37 times)
____________________ Robert. |
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| Posted: Thu May 24th, 2012 02:38 |
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15th Post |
Robert
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Look at the histogram at top right (Levels) The data only covers the first half of the chart, Black is at the left, White to the right. By adjusting the white point it removes the dullness and restores some brilliance to the image. It would have been better if the image had been exposed correctly in camera, it would give you a better tonal range. Here is what happens when you adjust the white point in the levels. Attachment: Screen Shot 2012-05-24 at 08.26.29.png (Downloaded 37 times)
____________________ Robert. |
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| Posted: Thu May 24th, 2012 02:50 |
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16th Post |
Robert
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OK, that may not be exactly the image you wanted but you can adjust the sliders and make many alterations yourself. This was done in iPhoto 11, 9.2.3 I rarely use iPhoto except for testing but it will do quite a lot if you dig around. Duplicate an image and play with the duplicate, you can't break anything and you can always revert to the original at any time. Look at the settings in the second screen shot, try adjusting the White balance further to blue. Adjust the tones, play around. Getting back to exposure, use the histogram on the back of your camera, you can toggle it on or off with the navigation button, up and down I think. Ideally a well exposed image will have data the full width of the histogram, without the white at the right climbing the wall. That means the whites are over exposed. Use the exposure compensation button to adjust the exposure in aperture mode.
____________________ Robert. |
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| Posted: Thu May 24th, 2012 04:38 |
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17th Post |
jk
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I think the photo is a very good first attempt. The flash is providing most of the exposure and depending on how strong the ambient light is you get a light/darker background. I think this image would be improved by reshooting at a smaller aperture f16 but this may not beossible with the equipment that Melissa has. When we get the newphoto gallery then we can start maybe to have themed projects/competitions or whatever you want to call them. Really I think that these are an opportunity to challenge yourself to make a photo of a certain subject in a short time frame.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Thu May 24th, 2012 12:49 |
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18th Post |
moonlight1811
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Robert wrote: OK, that may not be exactly the image you wanted but you can adjust the sliders and make many alterations yourself. This was done in iPhoto 11, 9.2.3 It may not have been the exact image I wanted, but it was a good demonstration and I understand more what you mean. I'll have to mess around with iPhoto some more. I think I get the concept of exposure much better, but I'm really unsure of how to adjust it and use it on my camera. Looks like I need to consult the manual and see what it has to say. Although that thing hasn't really been any help so far!
____________________ -Melissa |
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| Posted: Thu May 24th, 2012 12:53 |
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19th Post |
moonlight1811
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jk wrote: I think the photo is a very good first attempt. Thanks, jk. I know there is room for a lot of improvement. I don't really know what the equipment I have is capable of yet to be honest. I need to get out and take more pictures. I'm going on a short trip in two weeks and will hopefully get to then. Projects/competitions! I'm in! Even though I'm not very good...yet! =]
____________________ -Melissa |
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| Posted: Sat May 26th, 2012 10:21 |
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20th Post |
jk
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I used to be very competitive and played sport at a fairly high level so I find it difficult to translate this into photography except in a sell/buy situation where you are competeing for a customer. I really dont think that open theme competitions are useful unless you want to see other peoples work but I think displaying your photos can do this equally well. I think that providing a brief or theme and shooting to that is more challenging.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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