Provia 100 exposure question

[supa_ate_sixteen]

So I am using the NIzo 6080 and am finally shooting my Provia roll I reveived from Barry a while back. Its rated 100 ASA and is daylight balanced. I checked the notching in the pro 8mm cartridge and it doesn't seem correctly notched, which is no suprise.

I am using a the Minolta III hand meter and am a little stuck. I have heard that Nizo's run at about 1/40 a sec. at 24fps. My hand meter doesn't have a 1/40 setting, only 1/30th and 1/60th. I know I can bracket this info but I just want to confirm that my assumptions on the shutter speed of the nizo is correct or if I am going to screw up my roll of Provia.

Suggestions??

[Guest]

Others can answer this question better, so I hope they write in...

According to Need A Camera, Find A Camera, the Nizo 6080 has a variable shutter which has a maximum opening of 225 degrees. At 24 fps, that would deliver an exposure time of about 1/38th of a second.

If you want to change the variable shutter to be 150 degrees, that would give you a 1/60th exposure, appropriate for your meter. But you would be giving up over half a stop of sensitivity. On the other hand, your footage would be sharper and crisper with the shorter exposure time.

If you want to stick with the 225-degree angle, you could always rate the film as if it were a higher ASA (around 150?) and then go with the 1/60th reading, or at a lower ASA (around 80) and use the 1/30th.

But do try to get accurate exposure, of course. As I'm sure you well know, reversal film is quite particular and has extremely little room for error.

[S8 Booster]

Do not know you cam but I have a film of the same kind and found as follows:

Cartridge film speed notching is 17mm (checked).
In Martin Baumgartens guide this [originally] set the auto film speed cameras for:

ASA 160: EG 464 rated 160 ASA Daylight
ASA 160: TXR 464 rated ASA 200 Daylight (rated ASA 160 w/o filter [cartridge removes filter])

In both cases above the cartridges were notched to that the "daylight" 85 filter is completeley disbled.

Your 100 cart if identical to mine is incorrectly notched SO IT WILL ALLOW YOU TO USE THE 85 "DAYLIGHT FILTER.
This is completely wrong and will damage the colours of your daylight balanced film.

Awkwardly enough the cam filter will have to be set to "LAMP" or indor position always when shooting outdoor or indoor (tungsten) with an external on lens 80A filter (Fuji spec) or use daylight balanced 5500 artificial lights for indoor shoot without any filters.

As far as I know (but check) the Nizo will obly accept auto setting of DIN 15/17 and 21/23 (25/40 ASA - 160/100ASA).

If this is correct your cam will set it at 160A ASA by cartridge film speed notching and remember: the built in "daylight filter alway off (out/no use)

R

[S8 Booster]

If my theory about the Nizo ASA speed setting is correct you can do the following to get it exposed at 100ASA:

Use the internal in cam light metering system for setting aperture this way;

For measuring only, not filming.

Use the buit in daylight filter in IN position (Daylight/sun position)
Point your cam at target.
Read and lock the aperture at this setting. (F-stop)
Remove the daylight filter to LAMP/Indoor position.
start filming.

Reapeat for next take.

This method may be slow but will expose your film at 100ASA, not 160 ASA and the built in metering/exposure system will do all the settings for you reagrdless of shutter speed and fps setting.

However, their settings must not be changed after you lock the light metering system. (Aperture lock)


For reference you can double check with your external light meter and see if you can find a setting that matches. Best checked with a grey card like object to get a safe reading.

If you find a match you may use the external meter for next shoots setting the cams F-stops manually.

Should work OK. Test & Check, test & check. Dry tests!!!!!!!

R

[Maurizio Di Cintio]

Hi there!
Someone has previously stated that the Nizo 6080 features a variable shutter. Sad as this can be this is not the case. ALL sound Nizo's have fixed shutters and they have a 200 degree aperture which results in exactly 1/43 of a second of exposure per each frame, when shooting at 24 fps. I don't remember for sure, but at 25 fps (which supa_ate might want to use for telecine purposes if working in PAL) the Nizo should give you a circa 1/45 of a second exposure time.

This is just for completeness of information, but I would like to add that these exposure times are so close to those on the meter's scale that it should not really matter regarding the final result.

BTW I'd really like to try the Provia (and the Velvia as well, for that matter) myself. Where can I get a roll?
Regards