PRM From Ghana, joined Apr 2002, 348 posts, RR: 0 Reply 1, posted (11 years 4 days 22 hours ago) and read 2031 times:
If it's overcast cloudy conditions and you used ISO100 (rather than ISO10 in your post which I assume is a typo) then 1/640th at F4.9 sounds like quite a short exposure time to get well exposed shots......I would have thought the metering would have given you something in the ballpark of 1/250th at F4.9......if we assume general cloudy conditions.
If correct, that would explain your dark problem as being underexposure.....problem with the metering?
Sokol From United States of America, joined Apr 2001, 284 posts, RR: 3 Reply 2, posted (11 years 4 days 19 hours ago) and read 1970 times:
I am sorry it is ISO 100 not ISO 10.
Paul if I change it 1/250th you think it will be more lighter or same as before dark ? I would ask Zurich photographers what setting they use because in Zurich most of the time it's cloudy, foggy, raining....
PRM From Ghana, joined Apr 2002, 348 posts, RR: 0 Reply 4, posted (11 years 4 days 8 hours ago) and read 1907 times:
You could try taking a few shots in sequence the next time the weather is dull overcast all at F4.5 - perhaps 1/250th as you suggest, 1/350th and 1/500 and this should allow you to get one correctly exposed.
Bear in mind that a smaller aperture would help increase the depth of field and keep the whole plane sharp if your shooting approaches (something like F6.7 or F8) but at the expense of shutter speed - so you really need brighter weather to allow you to keep using a faster shutter speed.
If you have access to Photoshop, learn to draw a path around the plane. It takes some skill to do it properly, and a considerable amount of time.
Next, convert the path into a selection. Once you have a selection remove the path.
Now you have a selection of just the plane. Adjust curves and contrast. It only affects the selection. Ie. the plane.
Invert the selection. Now everything is selected except the plane. Make the background a bit darker if you wish so the plane stands out better.
Invert the selection again, now the plane is selected. Apply unsharp mask. Now the unsharp mask applies only to the plane, the background stays unaffected. And so on.
PixAir From Switzerland, joined Jan 2001, 4 posts, RR: 0 Reply 7, posted (11 years 3 days 23 hours ago) and read 1868 times:
This is a problem of a correct exposure and depends on the measurement method (integral, spot, ...) and the light reflected from the object. In general the high contrast, strong reflections and highlights from the airliner tells the camera meter to much light. Using slides an exposure compensation of +0.5EV or more helps (or set the ISO value for an ISO 100 film to 64 or 50).
Incorrect exposure results in poor quality which can be hardly corrected later with an application like Photoshop ...
Sokol From United States of America, joined Apr 2001, 284 posts, RR: 3 Reply 8, posted (11 years 3 days 21 hours ago) and read 1851 times:
Thanks for helping....
I tried all you showed me Mode TV, ISO 100, 1/320th and 1/250, F4.9 but it wont work
it does the same as before, clouds in the background looks lighter airplane darker. !!
I would like to show you one shot but I will send you e-mail to see that shot.
go check live in Anchorage Airport so you can see the weather overcast and i hope you will find out why my Canon S30 does that. http://www.dot.state.ak.us/anc/livecam.html
Craigy From United Kingdom, joined Jun 2001, 1118 posts, RR: 0 Reply 10, posted (11 years 3 days 1 hour ago) and read 1816 times:
With your arm outstretched, take a photo of the palm of your hand. Note the settings used and then use the camera in manual mode (if it has one) with these settings.
When the camera tries to meter the scene, it doesn't know what it is looking at, so it will try to meter a bright sky or a colourful landscape the same way. It does this by assuming that the average light over the whole scene is that of medium grey. If course with a bright sky and white aircraft this is not the case, but the camera does not know this, so it darkens the whole scene. As the sky is VERY bright, it darkens too much resulting in a poorly exposed aircraft. Even on overcast days, clouds are still very bright as they reflect a lot of light.
To allow more light into the camera, you need to have a slower shutter speed and/or larger apperture (F number).
Hope this explanation helps you to understand what is going on here.