Infared Help

[cyphoto]

Hi,
I would really love some tips on infared photography,
I would really like to try it, I have a hoya infared r72 filter,
My shots are grainy? any tips???
Cheryl::

[Abel]

what camera are you using? what settings are you using?

typically with an IR filter you have to use very slow shutter speeds in the range of several seconds which can cause a lot of motion blur etc if there is wind blowing, long grass, trees etc.

[cyphoto]

Canon eos 350D, Tripod, I will Slow the shutter down more, and try it thanks,
Cheryl

[Abel]

What shutter speeds and ISO were you using?

[cyphoto]

Has any one heard that certain lenses cause a vignette in infrared?? That is theproblem I am having with my Sigma lens a viginette shows in all of my infared photos the rest of the photo is great. but the center is like a ghost spectre..weird
CyPhoto

[Abel]

Cheryl, what Sigma lens is it that is doing this?

A Vignette is when the outer corners of the image have a slightly darker (or lighter) tone to them.

I think what your seeing is a "hotspot" in the center of your images. According to THIS LIST there are several Sigma lenses that do produce a "hotspot" so be sure to see if the one you are using is included in there.

The definition of a "hotspot" per the link above is:
The hot spot is a a result of internal reflections within the lens produced by the lens' coatings. Some types of coating are not transparent to near-infrared wavelengths.Hope this helps.

[cyphoto]

You are right it is a hot spot, I saw a web page that refered to it as a vignette, I didn't think that was right, a few of my Canon and sigma lenses are on the list. Thanks for the great help !! I love this forum!!!
Cheryl

[imported_Jeanette K]

The "list" was very helpful, thanks.

[Abel]

cool deal... sounds great.

i just got my camera back from being converted and i cant wait to get out and use it soon!

[martyfields]

On a bright outdoors scene, using a D200,Hoya IR filter, I get good results @1:5.6,ISO 400, @8 to 10 seconds. With the camera tripod mounted, you need to focus without the filter, and carefully add the filter to shoot. I have an Infrared gallery on my web-martinfieldsphotography.com. Most of these where shot with a converted Nikon.Hope this is of some help. Marty

[Abel]

First image from my newly converted Canon G9 point and shoot...

Shot at 1/60th , f8, ISO 80 at around 12 noon... edited in Photoshop CS3

Im looking forward to using it quite a bit at in San Fran this weekend during the meetup!

[martyfields]

Abel: I like your first attempt with your converted camera. I feel it would be a stronger image if you cropped of some of the foreground, and darkened it.The brightness draws attention from your main subject. Marty

[Abel]

Marty thanks for the tip!