Infrared R27 & Red filter 25A

[danzig@xxxxxxxxxxxxxx]

ello mates !


I tested my camera (a Nikon F90X) today with the 2 filters. I don't 
know what to think from the results I got. AF was turned off.



Manual Exposure, Matrix Metering w/o filter 

1/640   f22



Manual Exposure, Matrix Metering with R25A

1/125  f22

( filter factor: presumably: 2 1/3 stops from reading w/o filter)


Manual Exposure, Matrix Metering with R27

1/6 -1/8 (needle kept jumping between these 2)  f22

( filter factor: presumably: 6 2/3 to 6 1/3 stops from reading w/o 
filter )




Aperture priority, Matrix Metering w/o filter

1/640  f22


Aperture priority, Matrix Metering with R25a

1/125 f22


Aperture priority, Matrix Metering with R27

1/8 f22 

 

Looking at the results which at least make sense, since in my 
experience, R25A does have a factor of 2 1/3 stops. 

However I'm concerned about the R27.Supposedly leaving only 
1/64 ( 2x2x2x2x2x2= 64 ) of the original light intensity from the 6 
1/3- 6 2/3 stop figure I arrived at, I guess I could almost believe this 
is the right filter factor. But I would still like to ask everyone what 
they think the factor is ?


Yours truthfully,
ket


P.S. the only reason why I'm being such a bother to you folk is 
cuz, the F90X & the Minolta 4F are just recently bought and I'm 
still trying to get a feeling of how my gear works. I want to be able 
to know exactly how my equipments metering works w/o burning 
too many rolls ;) 

it's a big upgrade from my previous Nikon F601, & I had that beasts 
unreliable metering down to pat. This is my 1st roll with the F90X 
which is why I want to relearn everything the right way. Plus i shot 
infra red before I came to the list, bug mistake, should have come 
here to you learned lads first.

Thanks WJ ;) 
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