In article <33d49b88.0@scooby.nildram.co.uk>, rhdesign@nildram.co.uk says...
>"Michael Quack"
>>Neuman - Ruether
>><5qj1e4$ann@newsstand.cit.cornell.edu>...
>>> In article <33cbd781.1188027@news.redestb.es>, fmg1@mx2.redestb.es
>>says...
>>> [...]
>>> >Your TTL system will compensate for everything you put in your lens.
>>> [...]
>>> As I pointed out earlier in this thread (with a method for checking
>>> it for yourself...), this is often not true with colored filters for
>>> B&W films...
>>> Hope This Helps
>>> (David Ruether - http://www.fcinet.com/ruether )
>>Wrong again. The TTL metering feature works in black and white the same.
[...]
>Then please explain to me how, when I fit an orange filter with a +2
>stops factor for b/w, my TTL meter reading reduces by just one third
>of a stop. If I simply use the TTL meter, I get underexposed
>negatives. It's a well known fact that most TTL meters are not colour
>balanced and you need to use manual compensation for orange and red
>filters.
>
>Richard
Thanks for the support. BTW, virtually all strongly colored filters
are read incorrectly by most TTL camera meters, and compensations are
needed for at least the greens and various yellow filters, in addition
to the orange and red... Apparently MQ did not try my method of checking
his (or any other) camera meter for color error, so here it is again, for
those who missed it...:
Colored filters are a different story (the camera instruction book notwithstanding...;-), and do generally require compensation (with
Nikon, +1/2 stop with dark yellow, +1 stop with orange, and +1 1/2
with red). To check this for yourself, meter an evenly-lit large
grey surface without a filter. Apply the filter factor correction
for filter absorption (included in the instruction sheet with the
filter) to the camera controls (generally +1 stop for dark yellow,
+2 stops for orange, +3 stops for red) when putting on the appropriate
filter. Take a reading through the filter, and shift the compensation
dial or ASA until the meter indicates correct exposure (assuming the
light did not change on the grey surface, and you are reading it from
the same angle...) - you will probably find that the compensations
recommended above (or something like them...) must be applied for
the TTL meter to give the correct exposure (with the filter factor
for the filter applied to the no-filter exposure).
Hope This Helps
(David Ruether - http://www.fcinet.com/ruether )