Pinhole Ultraviolet Transmission Lens Test

Learning Ultraviolet Photography is proving to be such a challenge it reminds me of when I first picked up a camera. How wonderful to be able to shoot 35 photos and not find a single keeper. Reminds me of the film days. I’m finding that trying to imagine how an image will appear, when the focus is using non visible light, has many variables that can affect the outcome.

One of course is the light source. If you don’t have full sun cover, using a dedicated light for a specific bandwidth or a full spectrum flash is essential. Next is choosing quality filters that absorb all light not wanted to affect the image. Also, I’m finding that the lens choice is just as important as the light source itself. Very few lenses are truly dedicated UV lenses made from quartz rather than glass, so the challenge is finding “accidental” lenses that permit good UV transmission.

Below is a basic test I used to determine which of my older lenses would permit the best UV transmission in the 360-365nm bandwidth. I used a pinhole cover with a dedicated Hoya U360 and BG40 filter stack to eliminate all light in the visible and IR range. I used a white plastic as the background and focused a dedicated 365nm light on it. White balance was done on the background. Exposure time was 15 sec and iso 1600. All phtos were post processed with the same settings.

All lenses tested were set to f4 and the rear of the lens was set at 2 1/2 inches from the background. Lenses tested were the Lensbaby Sweet 35 and Edge 80 optics, the Lensbaby Twist 60 and Selective Focus optics, an El-Nikkor 50/4 and Meyer Optik Domiplan 50/2.8 and Helios 44M 58/2. The Domiplan is supposed to transmit down to 345nm from other test located on ultravioletphotography.com (great reference site). The El-Nikkor is also supposed to be a good transmitter. The clearer the light through the lens itself signifies better UV transmission, purple signifies the worst.

From my basic, non-scientific test I was suprised to see the Lensbaby Soft Focus optic seems to perform as well as the Domiplan and both the Lensbaby and Zeniton 35mm lenses performed well. The Zeniton 135 performed poorly, even though it is the same optical construction (4 element / 4 groups) as the Zeniton 35.

Test are as follows:

Lensbaby Sweet 35 and Edge 80 optics

Ultraviolet transmission test, Pinhole Optic, LensBaby, Sweet 35 optic, Edge 80 optic, Hoya U360 filter, 365nm light, UltraViolet, UltraViolet Photography, 365nm Photography, BG40 filter, Bishop CA

Lensbaby Twist 60 and Soft Focus optics

Ultraviolet transmission test, Pinhole Optic, LensBaby, Twist 60 optic, Soft Focus optic, Hoya U360 filter, 365nm light, UltraViolet, UltraViolet Photography, 365nm Photography, BG40 filter, Bishop CA

El-Nikkor 50/4 and Domiplan 50/2.8

Ultraviolet transmission test, Pinhole Optic, LensBaby, El-Nikkor 50/4, Meyer Optic Domiplan 50/2.8, Hoya U360 filter, 365nm light, UltraViolet, UltraViolet Photography, 365nm Photography, BG40 filter, Bishop CA

Zeniton 35/3.5 and 135/3.5

Helios 44M 58/2

Ultraviolet transmission test, Pinhole Optic, LensBaby, Helios 44M 58/2, Hoya U360 filter, 365nm light, UltraViolet, UltraViolet Photography, 365nm Photography, BG40 filter, Bishop CA

Black & White for Digital Cameras at “Shooting the West”

At Shooting the West

I was fortunate enough to attend “Shooting the West Photography Symposium” again this year and take a workshop offered by Mark Citret on creating B&W utilizing Lightroom for global adjustments and then PS for individual or spot work.
In the past I usually thought about my subject in greyscale and then shot as I imagined the final to be in my mind. I would post process in greyscale, then burn or dodge in layers/curves to bring the grey tones into the zones I desired. Finally, I would import into LR for final adjustments of blacks, whites, shadows/highlights and for any toning or sharpening I wished to add.

Mark’s technique is exactly the opposite and one I find to be interesting (as well as useful) evolving from many of the simple practices we used with film. Continue reading

Mule Days

Every year during the Memorial Day weekend, our small community of 3900 host approximately 30,000 guest for one of the best festivities in the nation – Mule Days.
What once started as a low key event for packers & outfitters to show their skills and for local businesses to attract vacationers to the Owens valley, this six day event just celebrated its 44th year and draws ranchers, trainers, packers and spectators from all over the world. Continue reading