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1500 questions
18
votes
3 answers
How does one use circular polarizers?
I just purchased my first circular polarizer. I have read the thread here about when to use it, but I still have a question.
How to use it?
A friend told me to spin the polarizer until the sky turns blue. However, in addition to not making sense…
BBischof
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18
votes
5 answers
What is the relationship between size of object with distance?
How does the size/length of an object vary with distance?
Is it a logarithmic relationship? exponential? linear?
I plotted a curve of the size/length of an object for different distances from the camera, and the curve looked…
fmvpsenior
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18
votes
2 answers
How to take extremely long (multiple month) exposure photos?
Was just going through an article where it was mentioned that Michael Wesely took a photo of a building being destructed and constructed and the shutter was open for 34 months.
How is it possible to get an image with such extreme exposures?…
GoodSp33d
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18
votes
7 answers
How can I see the number of shutter actuations for my Canon EOS 350D?
I have a Canon Digital Rebel XT (otherwise known as the EOS 350D). I'd like to find the number of shutter actuations.
I have tried ExifTool, and the ShutterCount is not part Exif information for a Rebel. FileNumber is though. For one of my latest…
WireGuy
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18
votes
5 answers
Why does a bigger sensor have better dynamic range?
I already understand all the theory behind how a bigger sensor leads to better control of depth of field, and lower noise. But I've yet to find a place that can explain why a bigger sensor gives you a bigger dynamic range?
erotsppa
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18
votes
5 answers
Why prefer the 18-55mm and 55-250mm lenses vs 18-200mm?
There seems to be a preference for to have the
18 mm - 55 mm
55 mm - 250 mm
lenses, but no mention of why they're better than a single 18-200mm. Could someone please explain why the two separate are better than the one combined, and if anyone has…
Evan Carroll
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18
votes
4 answers
What are shutter actuations?
I was just reading the question How many actuations are "too many actuations"? and trying to figure out what a shutter "actuation" actually is.
The only thing I can guess is that it's the number of times the shutter is released and restored — i.e.…
Peter Boughton
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18
votes
2 answers
How can I undo an intentional Gaussian blur when I don't have the originals?
I have a bunch of old pictures which I had performed a Gaussian blur on to use in a competition years ago and have now realised I do not own the originals anymore. Does anyone know of a tool out there which can help me sharpen the images to be able…
Jurgen Camilleri
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18
votes
7 answers
Do Lightroom and Aperture force you into using a specific folder structure?
I'm getting busy, which is a good thing. I need to be able to batch process raws, or rather make global edits, to increase efficiency. I've heard that Aperature and Lightroom are both good at this but also force you into proprietary folder…
Rob Clement
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18
votes
5 answers
How does changing focal length affect depth of field?
I'm curious about how my "area of acceptable focus" changes when the focal length of the lens I'm using changes as I zoom (or switch lenses). In particular, I'd like to know how the front & back focal planes change, thus changing the depth of field…
Craig Walker
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18
votes
5 answers
Does it matter which way the camera is orientated for the sensor cleaning to work?
With the advent of sensor cleaning in newer bodies - does it matter which way up you hold the camera whilst it is cleaning? I understand that the sensor cleaning works by vibrating the sensor to knock the dust off, to stick to a "very sticky bit" -…
Rowland Shaw
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18
votes
4 answers
How can I avoid soft dull "spots" in my pictures?
Recently, I've been doing a lot more photography, particularly with my 100-400mm telephoto and 16-35mm wide. I am skilled enough that I can capture the shot mostly as I want with just the camera gear, requiring minimal post processing. I'm a huge…
jrista
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18
votes
8 answers
How can I recover photo files from a memory card with a corrupt filesystem?
I know this is not specifically a photography issue but since many of us with prosumer/professional-level DLSRs use Compact Flash cards, it is bound to happen to others as well.
I have a Sandisk 16GB Ultra card that occasionally had the camera…
icelava
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18
votes
1 answer
Why are photographic gels called "gels"?
This question has been bugging me for a while, as I've been digging through filters on Adorama and B&H and various other sites for days now. I keep seeing numerous types of filters often tagged as "gels", like color correction filters, flash color…
jrista
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18
votes
2 answers
How can I restore analog pictures destroyed by airport X-Rays?
I have several analog color films recently developed from a vacation in Ethiopia. On the flights to and from Addis Abeba as well as on several inland flights the films have been repeatedly X-rayed. I have forgotten to pack them in safe containers.…
Johan Bezem
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