11-26-2010, 12:58 PM
[quote name='Klaus' timestamp='1290773926' post='4470']
I will certainly not go into the details of the local testing procedure. Leave us our little secrets, please. :-)
[/quote]
Of course. I'm not after any trade secrets (although I wonder what competitive advantages you want to protect. Everyone can run the Imatest software?).
[quote name='Klaus' timestamp='1290773926' post='4470']
However, the basic procedure is described at imatest.com. Their documentation is very extensive and their method is used across the whole industry (including the some of the camera manufacturers). They also describe a little how they can measure beyond Nyquist if you're interested.
[/quote]
Do you have a pointer to that bit in their documentation handy?
I found this "Sensor response above the Nyquist frequency is garbage.". They also write "Since MTF is the product of the lens and sensor response, demosaicing algorithm, and sharpening, and since sharpening typically boosts MTF at the Nyquist frequency, the MTF at and above the Nyquist frequency is not an unambiguous indicator of aliasing problems. It may, however, be interpreted as a warning that there could be problems.".
I understand that you want to keep trade secrets but on the other hand it would be great to learn how are making sure that you are avoiding aliasing problems with the K10D. If you don't want to disclose it you are asking people to simply trust you.
Also, are you positively sure that your K10D vs K-5 comparison is appropriate?
I'd really like to see more backing up of your claim -- which I understand is applicable only to your specific needs.
[quote name='Klaus' timestamp='1290773926' post='4470']
And one more - I know Falk personally.
[/quote]
I know. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/wink.gif' class='bbc_emoticon' alt='
' /> He wrote he may will give you a ring. Hopefully a chat between the two of you will help to clear up the K10D vs K-5 mystery. I can speculate as to why your claim may not be quite as unreasonable as it may seem at first sight (and hinted at this in previous posts), but a) I'd really love to hear a justification from you rather than speculate myself and <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/cool.gif' class='bbc_emoticon' alt='
' /> I think even after some explanations, your claimed difference will not be justifiable to the extent it is currently stated.
But I'm open to learn, so it will be great to hearing from you again.
I will certainly not go into the details of the local testing procedure. Leave us our little secrets, please. :-)
[/quote]
Of course. I'm not after any trade secrets (although I wonder what competitive advantages you want to protect. Everyone can run the Imatest software?).
[quote name='Klaus' timestamp='1290773926' post='4470']
However, the basic procedure is described at imatest.com. Their documentation is very extensive and their method is used across the whole industry (including the some of the camera manufacturers). They also describe a little how they can measure beyond Nyquist if you're interested.
[/quote]
Do you have a pointer to that bit in their documentation handy?
I found this "Sensor response above the Nyquist frequency is garbage.". They also write "Since MTF is the product of the lens and sensor response, demosaicing algorithm, and sharpening, and since sharpening typically boosts MTF at the Nyquist frequency, the MTF at and above the Nyquist frequency is not an unambiguous indicator of aliasing problems. It may, however, be interpreted as a warning that there could be problems.".
I understand that you want to keep trade secrets but on the other hand it would be great to learn how are making sure that you are avoiding aliasing problems with the K10D. If you don't want to disclose it you are asking people to simply trust you.
Also, are you positively sure that your K10D vs K-5 comparison is appropriate?
I'd really like to see more backing up of your claim -- which I understand is applicable only to your specific needs.
[quote name='Klaus' timestamp='1290773926' post='4470']
And one more - I know Falk personally.
[/quote]
I know. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/wink.gif' class='bbc_emoticon' alt='
' /> He wrote he may will give you a ring. Hopefully a chat between the two of you will help to clear up the K10D vs K-5 mystery. I can speculate as to why your claim may not be quite as unreasonable as it may seem at first sight (and hinted at this in previous posts), but a) I'd really love to hear a justification from you rather than speculate myself and <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/cool.gif' class='bbc_emoticon' alt='' /> I think even after some explanations, your claimed difference will not be justifiable to the extent it is currently stated. But I'm open to learn, so it will be great to hearing from you again.