So you think that you can judge tonality?

Ross Chambers · Oct 6, 2009

Try this:

http://apod.gsfc.nasa.gov/apod/ap091004.html

Regards - Ross

Jeff Searust · Oct 6, 2009

Going to make me nuts for a week...

Ray Rogers · Oct 6, 2009

Ross Chambers said:
Try this:

http://apod.gsfc.nasa.gov/apod/ap091004.html

Regards - Ross

I tried this 4 ways:
a)
just looking.

b)
with a hole punched out to view both A and B in isolation from the bkg,
but at the same time.

c)
same as b but with the connected A & B visable (open up two windows
to see all at the same time).

d)
I used a pentax spot meter to check simalar areas of the different
squares... I adjusted for the different angles...
(you need to rearrange your viewing angle for a fair result)

I won't tell you my results... I want to hear it from someone else...
but the spotmeter test gave me very interesting results!

Ray

Sirius Glass · Oct 6, 2009

Jeff Searust said:
Going to make me nuts for a week...

Ditto!

I clicked the button to connect them.

Steve

Vaughn · Oct 6, 2009

I did not believe they were until I used my hands to isolate the two squares...and waited several seconds for my brain to stop creating any difference.

vaughn

David Brown · Oct 6, 2009

This has been around for a while. And I still find it hard to believe even though I know it's true.

Galah · Oct 6, 2009

Ray Rogers said:
I tried this 4 ways:

...I used a pentax spot meter to check simalar areas of the different
squares... I adjusted for the different angles...
(you need to rearrange your viewing angle for a fair result)

I won't tell you my results... I want to hear it from someone else...
but the spotmeter test gave me very interesting results!

Ray

I used my Soligor Spot Sensor II:

A gave a reading of 8ev, B a reading of 6 and 2/3ev.

Random "light" and "dark" squares (out of the "shadow") gave the same reading of 8ev.

When "connected", A gave 6 and 1/3ev, and B gave 6 and 2/3ev.

Roger Thoms · Oct 6, 2009

I saved the image and opened it in Photoshop and sure enough squares A and B are the same. Kind of interesting to look at the values for the different squares.

Roger

Ray Rogers · Oct 6, 2009

Galah said:
I used my Soligor Spot Sensor II:

A gave a reading of 8ev, B a reading of 6 and 2/3ev.

Random "light" and "dark" squares (out of the "shadow") gave the same reading of 8ev.

When "connected", A gave 6 and 1/3ev, and B gave 6 and 2/3ev.

Yes, if understood what you wrote, I found sort of simlar results... I hope others will repeat and see if there is experimental error in our meter tests... (I actually found about 1 stop between the plain A and B! but less for the connected one's- I just did a very quick test so not all that confident- but they were obviously different) :confused:

Ray Rogers · Oct 6, 2009

rtbadman said:
I saved the image and opened it in Photoshop and sure enough squares A and B are the same. Kind of interesting to look at the values for the different squares.

Roger

Interesting.
I hope other people will also try the spot meter tests.
They are a bit tricky but also quite fun.

phenix · Oct 6, 2009

"So you think that you can judge tonality?"

So, you think you can dance?

darinwc · Oct 6, 2009

Thanks for sharing! I've seen these before but never thought to play a spotmeter against them.

One thing to note is that A is smaller than B, and A has a very bright patch of white above it. So be careful when metering.

Galah · Oct 6, 2009

Ray Rogers said:
Yes, if understood what you wrote, I found sort of simlar results... I hope others will repeat and see if there is experimental error in our meter tests... (I actually found about 1 stop between the plain A and B! but less for the connected one's- I just did a very quick test so not all that confident- but they were obviously different) :confused:

Yes, mine amount to about 1 and 1/3 of a stop so, allowing for "experimental error" we pretty well agree.

darinwc · Oct 7, 2009

Hmm I did not find any difference once I got close enough to make sure the metering area was completely within the shape.
So do a test.. make a test target on screen or paper.. half white and half black.
Start by taking a reading in the center of the white section. Then take additional readings closer and closer to the division.
Your reading should not change until the black section actually enters the metering area.

If your reading changes as you get closer to the black area, then perhaps that meter either is not confined to the circle indicated in the finder, or suffers from flare in the optics.

Shaggysk8 · Oct 7, 2009

How the hell do I tell my partner A & B are the same, what ever I show her she does not believe me....hahahahaha

dpurdy · Oct 7, 2009

I tried it with my pentax spot meter and both squares read 6 1/3 on my monitor. I thought they were cheating.

RalphLambrecht · Oct 7, 2009

Ross Chambers said:
Try this:

http://apod.gsfc.nasa.gov/apod/ap091004.html

Regards - Ross

This test shows why one should not use too white of a mount board.

So you think that you can judge tonality?

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