When I first saw the subject line IR Filters, I immediately thought of the old
IR film/flashbulbs from the 40
s supposedly used by detectives investigating prior to a divorce. At least this
list occasionally makes me smile.
----- Original Message -----
From: "Moose" <olymoose@xxxxxxxxx>
To: olympus@xxxxxxxxxxxxxxxxx
Sent: Monday, June 24, 2019 12:21:58 AM
Subject: Re: [OM] [OT] IR Filters
On 6/23/2019 5:43 PM, Willie Wonka via olympus wrote:
> I bought this item off of Amazon:
> https://www.amazon.com/gp/product/B071NSJCZ8/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
>
>
> It is identical to this one, same manufacturer, different vendor:
> https://www.amazon.com/gp/product/B0179EVREM/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
>
>
> I was led to believe that my pictures would look like the example given in
> the latter link, but instead, I see the following:
> https://www.flickr.com/photos/182054715@N08/48117205308/in/dateposted-public/
>
> This is a portion of my front yard and the camera was facing the sun. As you
> can see, the pictures do not look as advertised. I think I tried to go
> through the entire spectrum of the filter adjustments.
> Any theories why my pictures do not resemble anything that was posted in the
> description of the filter capabilities?
It appears that you have jumped into the deep end of a somewhat difficult and
complex type of photography. In addition
to the questionable example photos, you should have read the description:
"Infrared filters, sometimes called IR filters or heat-absorbing filters, are
designed to allow IR mid-infrared
wavelengths while block visible light.
. . .
Digital cameras are usually equipped with IR-blocking filters to prevent
unnatural-looking images. IR-transmitting
(passing) filters, or removal of factory IR-blocking filters, are commonly used
in infrared photography to pass infrared
light and block visible and ultraviolet light. Such filters appear black to the
eye, but are transparent when viewed
with an IR sensitive device."
So, you have added a device that blocks most visible wavelengths to a camera
body that blocks most IR. So, guess what?
You get the bit of long red and short IR light that gets past the two filters.
Probably because the filter you bought
isn't sharp cut-off, and perhaps the one in the camera also isn't, there is a
hole where you get some light, but it's
all red light.
It's possible to make B&W, semi IR photos with an unmodified camera, but real
IR work needs the IR filter in the Camera
removed.
What was done to create the sample images in the listing, I don't know. Perhaps
a camera with IR filter removed and
variable, not very sharp cut-off and not very efficient IR blocking filter
added?
True IR photography is always monotone, because the colors we see and cameras
ordinarily record for us don't get to the
sensor. Here's an example of a classic IR photo. <http://ctein.com/Peggy.jpg> I
have a print of this; it's gorgeous.
It seems to me that you have been seduced by some odd images into something
that's not going to do what you want.
Bad News Moose
--
What if the Hokey Pokey *IS* what it's all about?
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