Re: Anybody help with this IR filter?

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

On 16 May 97 at 22:58, Robert M Howells wrote:

> Hi all,
> 
> Just bought a 18mm lens for the canon EOS600 (lovely) which has 72mm
> filter thread so my filter won't fit, so tried 89B gel behind shutter
> but have had so many problems with hair shadows and dust on every neg
> that I feel I must resume the front filter approach, shame really, I
> loved had holding the camera....
> 
> Willem, I'm sure you're reading this, you mentioned in an earlier post
> about polyester foil filters for behind the shutter. Could you supply
> some more details. Do you have an 89B perhaps?

I am surprised you have so much problems with the BTFR (between the 
film rails) filter. I start wondering whether gel is not only very 
sensitive to moisture, but also static loaded easily. Right now I use 
a thick (0.4mm) polyester foil #87C in my EOS-1, and it has not given me 
any problem yet. Regrettably there are no foil alternatives other 
than the Lee #87 (0.1mm), other than gelatine that is. 
Btw, I can get you a non-Kodak #89B gelatine filter, perhaps it makes 
a difference in dust attraction. I does feel less moisture sensitive.
Btw2: AFAIK Kodak doesn't make #89B anymore, only #87 and #87C....I 
assume you use an old filter?

 
> Other than that I'm looking for a screw on filter 89B, R72 type but
> with a thread 72mm.
> 
> I could hold a square filter in front of the lens before pressing the
> shutter but, well, you know.......

Have you tried the Cokin-P holder, by holding the 'ears' 
horizontally? Only for gradual ND/color filters you need those ears 
vertically, to slide up and down. 

I also modified my P-holder by fitting the hood-bayonet system of my
Minolta 20mm and Canon 20mm/24mm TS-E directly, ie without the metal
filter ring. Gives you another 5mm gain, and in an last attempt you
could file off the top 2 slots from the 'ears'. If even that fails, 
then an ordinary 72mm screw filter probably won't work either....8-))
And only B+W sells dedicated wide angle versions of all their filters 
(Nikon & Heliopan only offer polarizers in wide angle version).

Btw, chances are high that I will order a custom color batch of #87B
filters in the near future. This is a darker color than #87C. It will
probably be a size mix of Cokin-P, Horizon 202 and Noblex filters
(1.5mm thick), but if anyone has special requests (4x4"?), please let
me know.


- -- 
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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