Re: BTRF

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

On 13 Aug 97 at 17:40, pbadcock@xxxxxxxxxxxxxxx wrote:

> Hi Willem,      
>                 I am interested in buying a few of the polyester foil 0.4mm IR 
> filters(#87C).  I have an F801s like Jaap, so the dimensions of 24.0x0.4x??mm 
> would suit my camera.  I currently use a #89B in front of my lens and you said 
> you were researching about a #89B BTRF at the moment.  Is this a glass or 
> polyester type you are looking into?

The #89B will be very thin (but rather flexible) resin, but a quality 
which can't be cut with scissors, so I have to have it cut on either 
a laser or water cutting device. Only for this one this very exact 
size of 24.0mm crucial, the other mentioned filters can be cut 
yourself.

> Is the material for the 0.4mm polyester foil #87C BTRF commonly available, or do
> I buy some through you??

0.4mm #87C is in stock, not available elsewhere other than in very 
large & expensive sheets (industrial stuff).
I prefer cutting a slightly larger size though, so that you can cut 
it yourself. Can cut with scissors normally, but the exact 24.0mm 
have to be done with a sharp knife and a metal cutting guide.
You could cut a flash filter from the remains, or for some other purpose.

But for US$2 pro square cm I could cut it exactly I suppose,
otherwise US$1. 





- -- 
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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