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  1. Replies
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    5,951

    It almost sounds like you're proud of that...

    It almost sounds like you're proud of that accomplishment. I guess you won't be needing any written instructions then.
  2. Replies
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    5,951

    Removed as unnecessary.

    Removed as unnecessary.
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    2,182

    I think a D90, flash, and charger in the Velocity...

    I think a D90, flash, and charger in the Velocity 6 will be a very tight fit, partially due to the rounded profile. The D90 itself with the kit lens + lens hood or with a 70-300 (lens hood in...
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    1,095

    The first thing you want to do is to join Cloudy...

    The first thing you want to do is to join Cloudy Nights Telescope Reviews at www.cloudynights.com. It is THE forum for all things astronomy, including astrophotography. Thatís where you want to ask...
  5. Replies
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    2,712

    1 to 2 stops slower.

    1 to 2 stops slower.
  6. Replies
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    1,103

    Prospero is right. The only thing I would add is...

    Prospero is right. The only thing I would add is how to get the stops difference.

    You get your difference in stops between ISO values with this (works in Excel)...
    LOG( SQRT( 160 / 100 ) ) /...
  7. Replies
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    1,786

    Sites complain about people using ad blockers and...

    Sites complain about people using ad blockers and other such software to avoid ads, but then they serve up ads with viruses. It?s not fair to the site to blocks their ads, but neither is it fair to...
  8. Replies
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    3,633

    Sure. Another way to say it is that shot noise...

    Sure. Another way to say it is that shot noise depends solely on the signal. If you want to reduce noise you must increase the signal.


    They matter to the level of signal collected. The...
  9. Replies
    33
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    3,633

    No, I?m not assuming that time is constant. I?ve...

    No, I?m not assuming that time is constant. I?ve discounted time entirely. Neither time nor intensity are variables. All that matters is the signal. If you increase ISO, all you?re doing is...
  10. Replies
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    3,633

    ISO refers to the sensitivity (gain) of the...

    ISO refers to the sensitivity (gain) of the sensor. It is a post-capture function. ISO 200 will double the captured signal levels over ISO 100. This affects noise because setting ISO 200 means...
  11. Replies
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    3,633

    It's just you. Variations in shot noise follow...

    It's just you.

    Variations in shot noise follow a Poisson distribution. Read about here...

    http://en.wikipedia.org/wiki/Poisson_distribution

    Basically, the variations of a sample will...
  12. Replies
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    6,247

    I think you're out of luck. Photoshop 7 doesn't...

    I think you're out of luck. Photoshop 7 doesn't support Sony RAW and it doesn't support DNG.

    Only Panasonic and Leica use the .RAW extension. Every other camera brand uses a different extension...
  13. Replies
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    3,633

    ?Noise? doesn?t refer directly to the speckles...

    ?Noise? doesn?t refer directly to the speckles you see in an image. Those are the result of noise. Noise refers to statistical variations in the captured signal levels. You can?t tell which way a...
  14. Replies
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    3,633

    I didn't say it was wrong. It's generally right....

    I didn't say it was wrong. It's generally right. I simply said it was old.

    But that said, yes, some of the things it says are wrong.

    For example:
    "Because of the very high resolution of the...
  15. Replies
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    3,633

    What does that mean? Whose standard? What...

    What does that mean? Whose standard? What organization set a printing standard of 300 DPI?

    I suggest you get a book on printing, or maybe just read the Qimage webpage on the subject. Canon...
  16. Replies
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    3,633

    I didn't miss the point. A higher pixel count...

    I didn't miss the point. A higher pixel count means that any given pixel will have more noise than a lower pixel count sensor, but the apparent noise of the image will be the same. This is so...
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    As you found out, the answer is no, the D90...

    As you found out, the answer is no, the D90 doesn't contain an intervalometer. However, there are aftermarket shutter releases that plug into the camera and provide various timer functions.
    ...
  18. Replies
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    Manual mode?? Why are you treating a marvel of...

    Manual mode?? Why are you treating a marvel of modern technology like at 60 year old Canonet? Manual mode is for dinosaurs who can?t understand Exposure Compensation.

    Maybe it's manual mode...
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    That's an old article. It's pretty common...

    That's an old article. It's pretty common knowledge now that noise is based on the sensor size, regardless of pixel count.
    ________
    FREE PORNO
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    Right. The built-in flash can be disabled so...

    Right. The built-in flash can be disabled so that it doesn't contribute to exposure, but the pre-flash can add some light, which is really only visible when the scene has dark, nearly black shadows....
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    I have a D90 and I just bought a Nikon SB-600. I...

    I have a D90 and I just bought a Nikon SB-600. I went with the SB-600 because I wanted to try off-camera flash operations. The D90 / SB-600 combo make this very easy because you can control the...
  22. Thread: Jpeg vs RAW

    by Graystar
    Replies
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    1,659

    There?s no such thing as JPEG vs. RAW. There?s...

    There?s no such thing as JPEG vs. RAW. There?s only RAW. In-camera JPEG images are made from RAW data. It?s just a question of whether you keep the RAW data along with the JPEG, or just toss it. ...
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    Yes, it?s interesting to see how large the...

    Yes, it?s interesting to see how large the differences are, but it really works. For example, between my Canon A710 (1/2.5? sensor) and my Nikon D90 (1.5 crop sensor) there?s a crop factor of 4. ...
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    The formula is: FL = FS * ( DL / DS ) ...

    The formula is:

    FL = FS * ( DL / DS )

    Where:
    focal-length of larger lens (FL)
    focal-length of smaller lens (FS)
    diagonal dimension of larger sensor (DL)
    diagonal dimension of smaller sensor...
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    Because you can't determine how much power is...

    Because you can't determine how much power is left in a cell just my examining it electrically. Due to the way that NiMH cells wear out from use, voltage isn't a good indicator of remaining power.
    ...
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