hoya

Infrared black and white processing.

in

Morning, i thought id share a couple of images taken at the local using the infrared filter.

Above are two images, one was taken normally and processed to black and white, where as the other is an infrared image then processed to black and white. 

As you can see there is quite a difference. The infrared image was shot at a longer exposure and so the water will obviously look quite different but i do like what happens with the foliage. 

02 infrared leaves city park hoya r72 filter

Nikon D800 70-200@200mm f3.5 1/80th ISO5000

Leaves high in a tree. I liked how the light was illuminating a small section. This again is a processed infrared image. This is a noisy file due to the high ISO used. I was trying to gain a fast shutter speed to eliminate any motion from the wind blowing the leaves. 

04 infrared lake city park hoya r72 filter

Nikon D800  70-200@70mm f8 13th ISO800

I have noticed that along with the Sky, water goes blue also. 

 

Thanks

 

Infrared lens hotspot.

in ,

Good morning. 

If you have purchased the infrared filter as i previously mentioned in a blog post couple of weeks ago, and have been shooting with it, you will have noticed the strange colouring that you have received. 

The bright red file is normal, Prior to shooting setting a custom white balance is recommended. A lot of advice i have read is setting it again green grass or foliage. For the below image being a city scape there wasn't much grass around, so i chose to shoot in RAW and play with the white balance later in post. 

One thing i have learn is the visible hot spot in the centre of the image. I shot this using Nikons 24-70mm f2.8 and lens hot spots are a most common problem encountered when shooting infrared light. They usually manifest in the form of a bright circle, sometimes in the shape of aperture leaves directly in the center of the image. The problem is exaggerated as you stop down (increase f stop number), with the spot becoming more prominent and defined. 

Hot spots can be caused for a variety of reasons, the most common of which is the coating on the inside of the lens barrel being reflective in IR light. Another frequent reason is light interaction between the coatings of the lens elements. A less common reason is light interaction between the lens elements and the imaging sensor(usually the micro-lenses) in the camera. In this case using the lens on one camera model may have no hot spot issues and on another model there could be prominent hot spots.

Unfortunately, if your lens has this issue the only solution is to simply use a different lens altogether. Fortunately the majority of lenses don’t have this problem or the problem is very minor and normally not visible in images.

Once i find a suitable lens and am happy with the results ill report back. 

If you have any suggestions to use on a Nikon body id like to hear your views. Feel free to use the contact page.

I hope that you enjoy these images. This is a new technique and something i am enjoying playing with. 

 

Thanks