Nice photos James, I like your 4x5 piggyback system. by the way, someone asked for my exposure time and I forgot to post that. It was:
24 minutes at the wide open setting of f/2.5. I used the Provia 100F chrome film and pushed it 3 stops in processing. That is the maximum the film is capable of being push processed and I think it held up admirably. And yes, I did use a clock drive- an iOptron iEQ45-GTN Pro. This model uses stepper motors instead of the synchronous ones so it can carry much more weight. My entire setup is pushing 75 lbs. (with counter weight) and it handled it easily.
Also, physixvox (see above) is correct in the original usage of this lens. My edition was manufactured in 1953, so was a late version and incorporated anti-reflection coatings. Not as good as they are today, but better than its predecessors which had nothing. This lens flew in a Fairchild K-37 aerial reconnaissance camera. They dropped flares at night which emitted strongly in the IR spectrum. This allowed them to use 9" x 9" IR B&W film to make their images. Strangely enough, all documentation says they only used a yellow (minus blue) filter for this combination instead of a true IR filter. I am very eager to test this with my IR film, using a yellow minus blue filter, a #29 deep red filter and finally a true IR #87C filter. I have all these in 6" x 6" gelatin filters to cover the lens opening. This should certainly answer many of the questions regarding resolution and aberrations.
I have attached a few more images to share- the original Fairchild K-37 camera my lens came from, the camera being attached to the reconnaissance plane, and finally a 4x5 image of the Old Mission here in Santa Barbara that I took years ago while a student at Brooks Institute. It was a 1 hour exposure and was illuminated by star light and a streetlight 2 blocks away.
24 minutes at the wide open setting of f/2.5. I used the Provia 100F chrome film and pushed it 3 stops in processing. That is the maximum the film is capable of being push processed and I think it held up admirably. And yes, I did use a clock drive- an iOptron iEQ45-GTN Pro. This model uses stepper motors instead of the synchronous ones so it can carry much more weight. My entire setup is pushing 75 lbs. (with counter weight) and it handled it easily.
Also, physixvox (see above) is correct in the original usage of this lens. My edition was manufactured in 1953, so was a late version and incorporated anti-reflection coatings. Not as good as they are today, but better than its predecessors which had nothing. This lens flew in a Fairchild K-37 aerial reconnaissance camera. They dropped flares at night which emitted strongly in the IR spectrum. This allowed them to use 9" x 9" IR B&W film to make their images. Strangely enough, all documentation says they only used a yellow (minus blue) filter for this combination instead of a true IR filter. I am very eager to test this with my IR film, using a yellow minus blue filter, a #29 deep red filter and finally a true IR #87C filter. I have all these in 6" x 6" gelatin filters to cover the lens opening. This should certainly answer many of the questions regarding resolution and aberrations.
I have attached a few more images to share- the original Fairchild K-37 camera my lens came from, the camera being attached to the reconnaissance plane, and finally a 4x5 image of the Old Mission here in Santa Barbara that I took years ago while a student at Brooks Institute. It was a 1 hour exposure and was illuminated by star light and a streetlight 2 blocks away.