Very interesting, Ralf. That's in my to-do list, now I'm digital-eyed.
But there is a long way...
lf
Ralf R. Radermacher escreveu:
http://www.fotocommunity.de/pc/pc/display/18201202
The Wratten #87 is an extremely strong IR filter, totally opaque to the
human eye. It is way beyond the sensiti
P. J. Alling wrote:
> The problem you're having Dave is that the Hoya R71 isn't an exact equal
> to the Wratten #87 filter. It allows enough Red through to over power
> the Red channel which will cause less crisp images.
Exactly. The R71 is more like an 89C which looks like a strong red
filter
The problem you're having Dave is that the Hoya R71 isn't an exact equal
to the Wratten #87 filter. It allows enough Red through to over power
the Red channel which will cause less crisp images.
David J Brooks wrote:
Thats a great shot Ralf. I used to use my istD and the Hoya R72
filter. I so
David J Brooks wrote:
> Are you letting the camera find focus, or manually focusing with the
> IR difference in mind. Asking as my istD shots were never as crisp as
> this one.
I was using a manual lens and focussing isn't that critical with a 20 mm
at f8. With longer focals and the #87, one has
Thats a great shot Ralf. I used to use my istD and the Hoya R72
filter. I sold mine but my sister still has her's.
I use a converted G3 now, mostly.
Are you letting the camera find focus, or manually focusing with the
IR difference in mind. Asking as my istD shots were never as crisp as
this one.
Ralf R. Radermacher wrote:
http://www.fotocommunity.de/pc/pc/display/18201202
Very nice Ralf. I did a couple of experiments myself a while back with
the *istDS and an 89b filter. I had quite a few problems with flare and
I seem to remember a bit of a hot spot in the middle of the sensor as
Yes, "fascinating" also came to my mind.
On Mon, Aug 17, 2009 at 2:59 AM, paul stenquist wrote:
> Fascinating. Nice work.
> Paul
> On Aug 16, 2009, at 7:29 PM, Ralf R. Radermacher wrote:
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Fascinating. Nice work.
Paul
On Aug 16, 2009, at 7:29 PM, Ralf R. Radermacher wrote:
http://www.fotocommunity.de/pc/pc/display/18201202
The Wratten #87 is an extremely strong IR filter, totally opaque to
the
human eye. It is way beyond the sensitization of the usual near-
infrared
films (Kon
http://www.fotocommunity.de/pc/pc/display/18201202
The Wratten #87 is an extremely strong IR filter, totally opaque to the
human eye. It is way beyond the sensitization of the usual near-infrared
films (Konica IR795, Ilford SFX200). Apparently, the DS' IR sensitivity
extends to much longer wavelen
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