Re: HIE exposure / metering question

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On  1 Apr 99 at 13:48, Joel Alpers wrote:

> 1. Isn't EI25 (again, this is metering without a filter)
>    a bit low for this film / dev combination? Seems so
>    to me, but it -is- close to giving good results.

25 ASA only works if you take a reading with an external meter, or 
without filter....
IOW N-TTF (not through the filter)
Otherwise it will depend completely on the red-sensitivity of your 
TTL-meter what ASA setting you need.... 

> 2. Anyone know what the R60(R2) filter designation means?
>    How "close" is this to a 25A filter for IR use?

'60' means 600nm, which is the 50% transmission spec of the filter, 
which equals a #25 red.
I believe R60/R2 is a Japanese/Hoya specification.

More about filters, transmissions and equivalents on my homepage, ULR 
in the admin footer below.


--                 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
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