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

UltraViolet Photography and Lensbaby

UltraViolet Photography and Lensbaby

Recently I have begun trying to work with UltraViolet light and my full spectrum K1. I’m enjoying it very much as the learning curve is proving to be a real challenge.

Most of my older lenses (and non of my newer digital) transmit the UV spectrum very well but I’ve been lucky enough to come across a few that are permitting me to do a some hand held shots. I’m finding simpler lenses with fewer elements and cemented groups seem to be working best so far. I’ve picked up a few 4/4 Zenitons and hope to show the results later in the spring during the wildflower season.

Here are a few using an older Lensbaby Soft Focus optic. It is 2 elements in 1 group.

The following are the exposure settings, filters and light source I used while photographing a White Geranium.

All were shot at f5.6 and on a 25mm tube.

Plant Photography, Geranium, Flower, Lensbaby Soft Focus Optic, Pentax K1, Macro, Macro Photography, 1:2 Photography, Closeup Photography, UltraViolet Photography, UV, UltraViolet, U360 Filter, 360nm Photography, Fine Art Photography

1st image is shot with U360 & Kolarivision hotmirror filter stack, FS converted speed-light, iso 800, 1/90th.

Plant Photography, Geranium, Flower, Lensbaby Soft Focus Optic, Pentax K1, Macro, Macro Photography, 1:2 Photography, Closeup Photography, UltraViolet Photography, UV, UltraViolet, U360 Filter, 365nm Photography, Fine Art Photography

2nd with U360/Kolari hotmirror and a dedicated 365nm flashlight, iso 800, 1/45.

Plant Photography, Geranium, Flower, Lensbaby Soft Focus Optic, Pentax K1, Macro, Macro Photography, 1:2 Photography, Closeup Photography, UltraViolet Photography, UV, UltraViolet, BG3 Filter, 365nm Photography, Fine Art Photography

3rd with BG3/Kolari hotmirror and dedicated 365nm flashlight, iso 1600, 1/90th.

Infrared Filter Comparison

I’ve really been enjoying working in digital IR this last year and have been doing a few Infrared Filter Comparisons to see which effect I prefer the most. I have attached a test subject of a tree stump in the desert shot with R72, #87 & IR850(87c) at the end for comparison. Continue reading

Macro Photography Lens Stacking

As I’ve mentioned on my macros page, I’m not a macro photography purist.
I don’t focus on achieving a 1:1 life-size ratio when photographing a subject.
I do prefer using dedicated macro lenses (at least close focus) or macro techniques while doing close focus work as I find there is less distortion than with wide angle lenses.
I also enjoy trying anything that will spur my creativity.

Lens Stacking, Lens Reversal, Pentax M200/4, Rodagon 105/5.6, Bishop CA, Pentax K-1, Macro, Macro Photography, 2:1 Photography, Closeup Photography, Extreme Macro Photography, Fine Art Photography

This last winter, I was reading a website on extreme macro photography lens stacking and came across an article about using the Pentax M200/4 as a barrel lens for micro-photograpy work.
Extreme-Macro is a fantastic site for studying anything to do with close focus work. There is a wealth of information ranging from techniques to lenses, lighting or magnification calculations.
The page I stumbled upon mentioned the Pentax M200/4 as a wonderful lens to couple with a microscope objective for extreme work.

Lens Stacking, Lens Reversal, Pentax M200/4, Rodagon 105/5.6, Bishop CA, Pentax K-1, Macro, Macro Photography, 2:1 Photography, Closeup Photography, Extreme Macro Photography, Fine Art Photography

As I have an old M200 that doesn’t get used in this digital age, I decided to pull it out and see what I might be able to do with what I already had on hand or at least low cost investment.
A 52mm-52mm coupling ring, a 52mm-40.5mm step-down ring (which I did have to buy) and my old Rodagon 105/5.6 enlarging lens reverse mounted.
I must admit here that I am often lazy about using a tripod unless doing night shots and still prefer using an optical viewfinder over the rear lcd so achieving and maintaining focus with any depth of field would be a challenge.
I was surprised at how easy this combination was to hand hold and still achieve nice photos with a magnification of approx. 1.9:1.
Also, it was a fantastic pleasure to view something larger than life and try to see it in an artistic style.

Lens Stacking, Lens Reversal, Pentax M200/4, Rodagon 105/5.6, Bishop CA, Pentax K-1, Macro, Macro Photography, 2:1 Photography, Closeup Photography, Extreme Macro Photography, Fine Art Photography

Next I tried a reverse mount combination of the M200 with a Sigma 24/2.8 for a magnification ratio of approx. 8.3:1.
The added weight of the Sigma made it much harder to handhold but still produced nice results, though even at f16 the depth of field is very shallow.
This will take a lot more practice to get the my creative sight going.

I have been enjoying this new artistic view of the world so much that I just purchased an old EL-Nikkor 50/2.8 enlarging lens to use in the field (don’t want to take my Rodenstock out into the elements)
and am now on the hunt for an infinity focus objective plus adapter.

Tiffen 87 IR Filter

Testing the Tiffen #87

Recently I picked up a NIB Tiffen #87 Infrared filter to see if I would enjoy working more with the shorter IR wavelengths (to produce a truer Black and White image) or if I wanted to stay with the 720 and under filters to achieve some color from visible light.
I have always preferred viewing B&W photos and movies to color and when I hold an image in my mind it is almost always in B&W.Infrared Photography, Infra Red, IR Photography, monochrome, monochrome photography, Pentax K-01, Tiffen #87 Filter, Mono Lake CA, Owns Valley CA, Lee Vining CA
The 87 comes in around 795 or just at the baseline of the IR spectrum. Not quite as black as the 093 (830) or 87c (850) but still dark to the human eye.Infrared Photography, Infra Red, IR Photography, monochrome, monochrome photography, Pentax K-01, Tiffen #87 Filter, Mono Lake CA, Owns Valley CA, Lee Vining CA
I do like the contrasty effect the monochrome images have over the false color, though it is difficult to achieve focus.
Infrared Photography, Infra Red, IR Photography, monochrome, monochrome photography, Pentax K-01, Tiffen #87 Filter, Mono Lake CA, Owns Valley CA, Lee Vining CA
The majority of my favorite lenses are still manual focus, so I will just have to practice more.
If you can find this filter it is made of glass with a metal ring and well constructed, plus it comes in at about 1/2 the price of other name brands.
I find the images comparable to the Lee 87 film filters for those who already have a holder system.
Infrared Photography, Infra Red, IR Photography, monochrome, monochrome photography, Pentax K-01, Lee #87 Filter, Mono Lake CA, Owns Valley CA, Lee Vining CA
I did notice under the right light and white balance there were a few shots that did have a hint of blue sky after an attempt at color swapping.

 

Lensbaby Plastic Optic Revisited

Very busy this month but I was able to revisit the Lensbaby Plastic Optic and play with a bit of Macro Photography in the yard.

Plant Photography, Iris, Lensbaby Plastic Optic, Bishop CA, Pentax K1, Macro, Macro Photography, 1:2 Photography, Closeup Photography, Flower Photography, Fine Art Photography

These were taken using a de-glassed Takumar-A TC for an extension tube, approximately 27mm in length, giving around 1:2 magnification.

Plant Photography, Iris, Lensbaby Plastic Optic, Bishop CA, Pentax K1, Macro, Macro Photography, 1:2 Photography, Closeup Photography, Flower Photography, Fine Art Photography

Very pleased with he results and really like the soft focus effect the lensbaby plastic optic offers.

And a few with IR:

Lensbaby Plastic Optic

Recently picked up the Lensbaby Plastic Optic.

I arrived at Lensbaby to late to buy the original optics as a kit and started with the Sweet35.

Selective Focus Photography, Plastic Optic, LensBaby, Exa Camera, Pentax K-01, Bishop CA, Owns Valley CA
Lensbaby Plastic Optic @f8

Though the Lensbaby system isn’t for everyday shooting, I really enjoy the special effects they create.
Think I own all of the original optics now plus the Sweet35 & Edge80.

Selective Focus Photography, Plastic Optic, LensBaby, Exa Camera, Pentax K-01, Bishop CA, Owns Valley CA
Lensbaby Plastic Optic @ f4

Of all of the first generation plug ins, I think the Zoneplate and the Plastic are my two favorites. Really enjoy the vintage Holga or Dinah look this optic creates.

Selective Focus Photography, Plastic Optic, LensBaby, Exa Camera, Pentax K-01, Bishop CA, Owns Valley CA
Lensbaby Plastic Optic @ f2.8

And a few from the filed

Infrared Photography and Pentax F300/4.5

Added a couple of new lenses to the infrared photography lens hotspot database,
the Pentax F300/4.5 and the Pentax F 35-70/3.5-4.5.

Infrared Photography, Infra Red, IR Photography, Pentax K-01, R72 Filter, Pentax F300/4.5, Owns Valley CA, Sierra Nevada CA, Mount Humphreys CA, IR Hotspot, Database

Both performed very well with no hotspots or flare issues.
The autofocus on both was fast and accurate.
Infrared Photography, Infra Red, IR Photography, Pentax K-01, R72 Filter, Pentax F300/4.5, Owns Valley CA, Sierra Nevada CA, Horton Creek CA, IR Hotspot, Database

I especially enjoyed the extended telephoto reach of the F300.
Can see how this lens is rated as a stellar performer and could easily become a go to lens choice.
Infrared Photography, Infra Red, IR Photography, Pentax K-01, R72 Filter, Pentax F300/4.5, Owns Valley CA, Sierra Nevada CA, Basin Mountain CA, IR Hotspot, Database

IR Lens Hotspot Database

kolarivision.com has an excellent ir lens hotspot database already compiled; however, I noticed most of my older film lenses weren’t included so decided to create a database (bottom of page) testing these lenses on the Pentax K-01.

Infrared Photography, Infra Red, IR Photography, Faux Color, Pentax K-01, R72 Filter, Manzanar CA, Owns Valley CA, Japanese Internment, IR Hotspot, Database
Pentax A35/2.8 Continue reading

Infrared Photography

I remember trying Infrared Photography a few times in my film days and found it difficult and challenging.

It always seemed I was guessing the exposure time and the focus, trying to approximate the red line on the lens distance scale.

Infrared Photography, Infra Red, IR Photography, Pentax K-01, R72 IR Filter, Bishop CA, Owns Valley CA

Winter Farm IR

Recently, I acquired a Pentax K-01 and had it converted to a full spectrum camera. Unlike film, digital sensors are sensitive to all light waves (UV, visible bands and IR) so most cameras use a hot-mirror to block the infrared bands and pass only visible light.

Infrared Photography, Infra Red, IR Photography, Mules, Animal Photography, Pentax K-01, 25A Red Filter, Bishop CA, Owns Valley CA

Winter Mules IR 1

Most conversions replace this hot-mirror and replace it with an IR based filter for a full time conversion, usually in the 720nm range. With the full spectrum conversion the mirror is removed and the IR filter is placed over the lens, much like the film days; however, unlike the film days I can see the image in live view just as if I was looking through a viewfinder.

Infrared Photography, Infra Red, IR Photography, Mules, Animal Photography, Pentax K-01, 25A Red Filter, Bishop CA, Owns Valley CA

Winter Mules IR 2

Apparently the new mirror-less systems make fantastic digital infrared cameras. They automatically set accurate exposure and the focus can be determined manually via live view or calibrated for auto focus. Another wonderful aspect of the K-01 is that it will take all my older Pentax K mount lenses.

Infrared Photography, Infra Red, IR Photography, Monochrome Photography, Monochrome, Pentax K-01, 25A Red Filter, Bishop CA, Owns Valley CA

Winter Tree IR

I now need to experiment with several to determine which will be good performers or or which will be susceptible to flares and hotspots. Infrared is often most noted for its use with contrast or faux colors with vegetation.

Infrared Photography, Infra Red, IR Photography, Faux Color Photography, Faux Color, Pentax K-01, 25A Red Filter, Bishop CA, Owns Valley CA

Faux Color IR Canal

Here are a few shots from the winter local scenery, a bit different but fun. I look forward to working with the camera as the spring green comes around.

Lensbaby + Pentax K-1

Playing with the Lensbaby on the Pentax K-1.

Been busy with work and dealing with the cold weather so haven’t been able to do much in photography this month.

I did get enough time to take the older Lensbaby optics out and play with them a bit on the Pentax k-1.

Very different using the double glass and single glass instead of the newer Edge or Sweet models but found them very enjoyable to work with. Fun to have to think about the aperture one wants first and then install the disk as opposed to setting the aperture in the lens.

I did get lucky one day and had an Egret land in the artisian well I was working around using the double glass.

Egret with double glass

Selective Focus Photography, Double Glass Optic, LensBaby, Bird Photography, Egret, Wildlife Photography, Pentax K-1, Bishop CA

Winter tree with single glass

Selective Focus Photography, Single Glass Optic, LensBaby, Monochrome Photography, Monochrome, Pentax K-1, Bishop CA

Winter pasture with single glass

Selective Focus Photography, Single Glass Optic, LensBaby, Monochrome Photography, Monochrome, Pentax K-1, Bishop CA, Owns Valley CA

Pentax A50 f2.8 macro & K-1

Recently pulled out the old Pentax A50 f2.8 macro for a few shots of autumn leaves in the back yard.

This lens performs wonderfully on the new Pentax K-1. Though not a “true macro” with a reproduction of 1:2, I find the scale adequate and the IQ superb; plus it is such a joy to use.

I can see why vintage Pentax glass was noted for it’s quality, the colors are brilliant and the IQ is sharp for the area of focus. Bokeh is pleasantly pleasing also. This doesn’t seem to change on the new digital sensors either.

In fact, I find their performance is equal to or better than the newer digitally enhanced lenses.