Re: Wratten 25 vs. Wratten 29

[Hannu Jarventaus <teklahj@xxxxxxxx>]

On Sun, 20 Oct 1996, Robert Long wrote:

> On Sun, 20 Oct 1996 01:20:24 +0100, Willem-Jan Markerink wrote:
> 
> |Well, I have had more people asking me about a #29 solution, but I
> |have difficulty understanding the need for such a slight improvement
> |over #25, considering that both #70 and #89B can most likely also be
> |used as a visibly transparant filter. Although possible as a resin
> |square, I don't think a #29 will ever end up in my arsenal....
> 
> I like what I've been getting with a 25 but figured to make it a
> little moreso.  So when I went to a recent swapmeet I was really
> looking for a # 70.  All I found was a single #29, the right size for
> my 28mm, so I bought it.  It is visibly less orange than the 25. 
>  

I guess that you are not going to see big differences between 25 and 29.

I use most of the time B+W 091 filter (like #29) with Konica IR 750.
Maybe the best reason for it is the fact that this filter has 52 mm thread.
The lenses that I mostly use when shooting IR are Sigma AF 24/2.8 and
Canon EF 50/1.8 (these both have 52 mm filter thread). If I shoot with some
other lenses, I use Hoya 25A or Cokin 003 (both like #25). 
The difference in pictures is very hard to see, although in theory there 
is a little difference (see IR filter data in WJ's home page).


Hannu Jarventaus


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Topic No. 3