How Many of You Old Timers Recognize This Symbol
May 30, 2021 16:52:40 #
A bit of history. In the Navy (back in the day) it was called IFGA. Stands for Image:Focal Length::Ground Size:Altitude. You know the image size on the film, the focal length of the lens, & the altitude it was taken at; then plugging the numbers into the formula, you can determine the size of object you photographed. The same still applies today if you need to determine the size of something you shot but can't measure it directly.
May 30, 2021 17:02:51 #
May 30, 2021 17:25:06 #
May 30, 2021 17:28:15 #
Zooman 1 wrote:
Never heard of it. All of our aerial stuff was turned over to the interpreters.
I went through PH "A" school at Pensacola in 1967. We had to learn how to apply the formula as part of the block on aerial photography. I never used it once I graduated from school. We started out with 4X5 view cameras & graduated to Speed Graphics. Out of a 5 month course, we spent 2 weeks on medium format, 2 weeks on aerial, & 1 week on 35mm.
May 30, 2021 17:29:47 #
Then if you know any three variables you should be able to calculate the fourth?
May 30, 2021 17:30:49 #
May 30, 2021 20:23:06 #
Curmudgeon wrote:
Then if you know any three variables you should be able to calculate the fourth?
You'd be amazed how many guys I was in class with that never figured it out.
May 31, 2021 08:25:53 #
May 31, 2021 08:40:01 #
I went PH A school in summer of 68. It is my understanding that there were two photographer rates, aerial photographer was a separate rate, they had been combined into one rate by the time I went to A school and the wings had been removed from the IFGA. I remember being amazed that photographer was an aviation rate.
May 31, 2021 13:52:48 #
That symbol was used to identify those of us who were PTs (Photographic Intelligenceman). It was combined with an image of a steroscope. My "A" school equivalent was at the Armed Forces Air Intelligence Training Center, on Lowry AFB, just outside of Denver, CO in 1964-1965. That was a great place for a sailor to be stationed! USN 1964-1970.
May 31, 2021 13:55:47 #
nicksr1125 wrote:
A bit of history. In the Navy (back in the day) it was called IFGA. Stands for Image:Focal Length::Ground Size:Altitude. You know the image size on the film, the focal length of the lens, & the altitude it was taken at; then plugging the numbers into the formula, you can determine the size of object you photographed. The same still applies today if you need to determine the size of something you shot but can't measure it directly.
So 🆒🆒🆒🆒🆒
May 31, 2021 17:39:24 #
nicksr1125 wrote:
A bit of history. In the Navy (back in the day) it was called IFGA. Stands for Image:Focal Length::Ground Size:Altitude. You know the image size on the film, the focal length of the lens, & the altitude it was taken at; then plugging the numbers into the formula, you can determine the size of object you photographed. The same still applies today if you need to determine the size of something you shot but can't measure it directly.
Now I've just gotta buy a plane to use this new knowledge. I just recovered my old Nikon F film camera and assorted lenses from my daughter, so with the plane I can do some experimenting. I just hope the plane has auto-pilot.
May 31, 2021 21:01:31 #
nervous2 wrote:
Now I've just gotta buy a plane to use this new knowledge. I just recovered my old Nikon F film camera and assorted lenses from my daughter, so with the plane I can do some experimenting. I just hope the plane has auto-pilot.
I bet you could do the experiment without the aircraft. Just place your objects on the ground under your home's balcony or other elevated perch and compute the values using millimeters and centimeters instead of feet. Tip: if you use inches, use an engineer's scale that provides 10ths of inches to simplify the math. I do admit, using the airplane would be more fun...
May 31, 2021 22:19:01 #
BurneyHuff wrote:
That symbol was used to identify those of us who were PTs (Photographic Intelligenceman). It was combined with an image of a steroscope. My "A" school equivalent was at the Armed Forces Air Intelligence Training Center, on Lowry AFB, just outside of Denver, CO in 1964-1965. That was a great place for a sailor to be stationed! USN 1964-1970.
My rating identifier was the IFGA. By the time I went through Photographer's Mate "A" school in 1967, the aerial & ground ratings had been combined but, they still taught the formula. Your "A" school was next door to the photo school, buildings 382 & 383. Not sure when 383 was built but, I went to 23470 school July-November 1972. It was fairly new then. I returned as an instructor in the 3ALR23331 course (the equivalent of the 23470 course) in December of 1975. I did 4 years in the Navy & 18 in the Air Force.
May 31, 2021 22:21:46 #
copladocus wrote:
I bet you could do the experiment without the aircraft. Just place your objects on the ground under your home's balcony or other elevated perch and compute the values using millimeters and centimeters instead of feet. Tip: if you use inches, use an engineer's scale that provides 10ths of inches to simplify the math. I do admit, using the airplane would be more fun...
That would be an outstanding way to teach young folks some of the scientific aspects of photography.
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