How Many Speed Notch Settings In Your Camera?

[super8man]

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[mattias]

that's exactly what i thought. this means that if you add a filter notch to a 100d cart it's read by the camera as 160t. exactly what kodak's chart says.

(the 160 type g was rated as daylight then i guess? you meant to say that it's read as a 250t with a notch, not d, right?)

/matt

[super8man]

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[T-Scan]

From S-8 Mans's website [/quote]When I covered up the lower notch on the second cart with tape and inserted it, the light meter fell by 2/3rds of a stop. This indicates that the camera THINKS the film is 25ASA daylight balanced film. [quote]

I still disagree.. when you covered the notch, all that happened was the tape suppressed the filter switch and swung the filter out of place.. now you have more light hitting the meter, therefore causing it to respond by dropping 2/3rds. Now to test my theory, place another 85 filter over the lense and it should open up by 2/3rds again. there is no need for the metering system to "think" differently

[super8man]

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[T-Scan]

a effective 16T filmstock with your 85 filter in front of the lens..ouch.

What do you mean? the filter is changing the color temp to daylight, just like the internal one does. My point is there is no recalibrating by the meter notches, which seems to be what you guys are thinking.. and my theory is.. a 100D cart can have a 6mm notch for 100ASA, and by not having a filter notch will only remove the filter.. therefore stimulating the meter the same as you would for 100T. and thats what you want.. a 100ASA reading with no filtration will expose 100D correctly.

[Santo]

So, according to the Kodak website, that combination of a 160 cutout notch and a lower notch NOT CUT OUT would tell the camera to meter at 160.

...Santo is correct on this...

yep

...all that happened was the tape suppressed the filter switch and swung the filter out of place.. now you have more light hitting the meter...

nope. the light meter gets it's reading before the light even reaches the filter because of the beamsplitter. Which give you your image in the viewfinder and provides light to the lightmeter. This is why your viewfinder doesn't turn orange with the filter turned on. The light hitting the meter is constant

[Santo]

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[Santo]

Cut a lower filter notch in the Type G film with a dremel and it would rate at 250 internally but the 85 filter would swing into place making the effective speed 160.

I used to cut the filter notch section out of plus-x when i had a Canon 814 autozoom to use the internal orange filter. It wouldn't engage otherwise in that very mechanical camera.

This is an interesting proposal. I don't know if that's right or not.

Hmmm...

The film speed notch is 160.

The filter notch is "in".

Hmmm... worth cutting out a plus-x cart to test this theory. Somehow I doubt it would now be 160asa

[mattias]

Actually, my old TYPE G carts (I have two kicking around, one Kodak, one FOCAL (ugh) 160 daylight carts) do NOT have the notch

yes, that's what i meant by "rated daylight".

yep

good, then all the sane ones of us agree. let the others keep believing whatever they want. :-)

/matt

[mattias]

Hmmm... worth cutting out a plus-x cart to test this theory. Somehow I dowubt it would now be 160asa

it should if you then removed the filter manually. it would still be rated 100 without manual intervention though since the filter would be engaged. this will give you the wrong readings, but since the camera will think it's a tungsten film it's still very logical.

/matt

[Santo]

Alright, let's play along with this and see where it leads...

Here's something anybody can try. Perhaps I'll just tape up a K40 cart I've got sitting around. According to this theory, it should now rate at 64 asa. Correct? Because now the camera thinks it's daylight film. This is what you're contending.

I'm going to load some batteries into my Nizo. I would encourage anybody reading this thread to do the same and get their camera ready.

Then what I'm going to do is aim my camera at a target, load it with K40 without the filter on, and see what rating I get. Then I'm going to tape up the K40 bottom notch and see what I get. If the f-stop changed? Is the camera now recognizing the K40 as daylight balanced film of a stop higher?

[Santo]

Alright, just completed my test.

K40. A 40t notched cart. I turned off the camera's internal filter.

Mounted it on a tripod and aimed it at a target. Camera ttl rating? A touch over f5.6

Took the film out of the camera, taped up the lower filter notch -- even put a piece of thick plastic in the way so that the feeler peg couldn't push through.

Result? A touch over f5.6.

Conclusion. A cart notched at 40t/25d does not become a 64d cart with the filter notch area intact.

[Santo]

Based on my findings, here's what I believe. The lower notch reader does indeed feel to indicate whether or not it is daylight or tungsten cart. Colour or black and white.

However, at least in the Nizo, a filled in/intact lower cart section where the filter reader goes does not make a 40t cart rate higher than the notch above tells the camera it should. All it does in that camera is prevent the "filter weighted" 25 asa from being factored in. Perhaps it prevents the filter from being engaged, I don't know, but it does stop the filter from being factored into the equation of the camera's internal meter.

So, at least in the case of K40, the camera does not increase the film's rating above what the "t" rating is (40asa) because there is material in the way of the filter sensor pin.

[mattias]

According to this theory, it should now rate at 64 asa. Correct? Because now the camera thinks it's daylight film. This is what you're contending.

no, it should rate as 25asa according to the theory. who's caught in the mind trap now? :-)

/matt