I think this is my last test on the Coastal Optical 60mm f/4 UV-VIS-IR Apo Macro lens. It’s a simple visual demonstration of light falloff. The camera is a Sony a7 modified for IR by LifePixel, using the Super Color sensor stack filter. I put an Expodisc on the lens and aimed it at a… [Read More]
Archives for January 2015
Coastal Optical 60mm f/4 MTF in IR
I redid the testing of the previous post with an R72 filter in front of the lens. This filter blocks visible light, passing IR with a nominal corner wavelength of 720 nm. For the record, here’s the test protocol. I mounted the Coastal Optical 60mm f/4 UV-Vis-IR Apo Macro lens (hereafter called the CO 60) to… [Read More]
Coastal Optical 60mm MTF in mixed IR & visible light
I mounted the Coastal Optical 60mm f/4 UV-Vis-IR Apo Macro lens (hereafter called the CO 60) to the LifePixel-modified Sony alpha 7. The LifePixel filter absorption curve is “Super Color”. I mounted a RRS L-plate, clipped it in landscape orientation into an Arca Swiss C1 head which was attached to a set of RRS TVC-44 legs…. [Read More]
IR photography with the Sony a7 & CO 60mm f/4
Yesterday I went for a walk near my house with the LifePixel-modified alpha 7 and the Coastal Optical 60mm f/4 lens. No tripod. As an informal flare test, I shot into the sun: The above image is a ten-exposure stitch, with the camera held in portrait orientation, and a single row. I consider this… [Read More]
One thousand and one
I just noticed that yesterday’s post was my 1000th in this blog. It’s been a labor of love, and, although sometimes it has consumed more of my time and energy than I would have liked, I’ve enjoyed it immensely. I hope you have, too. Thanks to all you readers out there! Jim
- « Previous Page
- 1
- 2
- 3
- 4
- 5
- …
- 7
- Next Page »