[rollei_list] Rollei color conversion filters
- From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Sun, 8 Aug 2010 10:49:56 -0300
I commented some days ago I received two Rollei filters, R1 and R5, as
compensation for the fact I finally got a complete Rolleinar 1 BIII
set instead of the Rolleinar 3 BIII that was a mixed Rolleinar 3 for
the viewing lens and Rolleinar 1 for the taking lens, the seller sent
me the Rolleinar 1 BIII for the Heidosmat viewing lens with the
filters.
I don’t recall a topic about the scale used by the Rollei conversion
filters for color shots despite it could have significant practical
effects and the fact it’s different regarding the Wratten filters.
Rollei conversion filters for color shots use the European Mired or MD
scale, this is a mathematical scale that allows to calculate the
filter effect previously. These filters have the letter R (red or
reddish) to warm the colors and B (blue or blueish) to cool the
colors, some manufacturers like Schneider B+W use KR and KB letters.
R Mired filters absorb violet and blue and a bit of green light and
UV radiation, allowing to pass red and yellow undiminished; B Mired
filters attenuates the higher red, orange and yellow components
present at the tungsten illumination mainly allowing to pass the blue
light undiminished, they can be used for natural light too of course.
The number added to the letter gives you the filter effect power and
then a R3 (or KR3) has twice the effect regarding a R1,5 filter and a
R6 filter has double effect regarding a R3 filter, similar for the
mired B or KB filters.
Rollei has the mired conversion filters for color shots R1; R1,5; R2;
R5 and R11 and B1; B2;B5;B11, where R1 and R1,5 could be considered
Skylight filters to be kept on the lens at all times.
It means I can use my R1 and R5 filters separately according I
want/need weaker or stronger effect, but I can also use both together
for an even stronger effect, I obtain a R6 filter this way (R1+R5).
Anyway I also know that even the best filter can cause a worse lens
performance, it depends (in part) about the subject too, the sharpness
you gain using an UV filter for mountains/hills distant views
surpasses a possible worse lens performance.
Carlos
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