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11-04-2011, 07:23 AM   #1
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Flange Distance

Hello

Does anybody know the real flange focus distance of Pentax Q ? I've checked it myslef and my result is approx. 8.85mm instead of 9.2mm what all specifications claim. I' ve heard that adapters available on ebay focus beyond infinity. so they have to be too thin. Maybe my camera body is faulty? What are your opinion?


Last edited by borsuk; 11-04-2011 at 07:35 AM.
11-04-2011, 08:34 AM   #2
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Hello, have you included the IR filter's proper flange to sensor ?
11-04-2011, 10:50 AM   #3
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As noted, unless you know the precise thickness of the various filters on top of the sensor, you have no way of measuring the flange distance without stripping them off to expose the sensor.
Sometimes it's best to just trust what the manufacturer says, and if the thing seems to be working properly, it probably is working properly.
Too many people think they are rocket scientists, and start trying to quantify things with what they think is precision, but end up effectively using a pointed Popsicle stick.
11-04-2011, 01:24 PM   #4
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I used the 9.2mm measurement when making my Q-110 adapter and it was spot on.

11-05-2011, 01:10 AM   #5
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I used a professional optical bench so I'm almost sure that my FFD isn't 9.2mm.

Has anybody measured the thickness of ebay's adapters?
11-05-2011, 04:22 AM   #6
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QuoteOriginally posted by borsuk Quote
I used a professional optical bench so I'm almost sure that my FFD isn't 9.2mm.

Did you strip off the cover glass and various filters as well?
11-05-2011, 05:12 AM   #7
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QuoteQuote:
Did you strip off the cover glass and various filters as well?
I did not. It wasn't a "physical" measurement. I did not have to tuch the sensor.
11-05-2011, 03:38 PM   #8
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QuoteOriginally posted by borsuk Quote
I did not. It wasn't a "physical" measurement. I did not have to tuch the sensor.
You've got me curious now. How is the measurement done?

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