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The Nikon focal-length simulator with markings for a DX (i.e. 1.5xcrop-sensos). Gives a picture of what different lens focal-lengths mean in practice
"KENNEDY SPACE CENTER, FLA. - With a foot on one of the four landing pads, Apollo 11 Commander Neil A. Armstrong descends ladder of lunar module training spacecraft. While he and Edwin E. Aldrin, Jr., explore the Moon's surface, Michael Collins will pilot the command spacecraft in lunar orbit. The National Aeronautics and Space Administration directs the Apollo program."
The photograph was taken in the KSC Flight Crew Training Building (FCTB).
Note the stairs/steps & multiple oddly angled components of one of the two Command Module mission simulators in the High Bay area of the building, seen behind Neil's head & upper back, on the other side of the walled partition. Additionally, I think the angled object, with the protruding element at its top, near the face of the technician on the right, is part of the single Lunar Module simulator near the far wall.
Finally, there does appear to be a commemorative plaque between the third & fourth rungs from the bottom of the ladder, although no writing on it is resolvable. Maybe it’s just a placeholder. Or the cover’s still on it. ¯\_(ツ)_/¯
The source for my above enlightenment...excellent stuff:
space.stackexchange.com/questions/37783/what-is-the-curre...
Credit: StackExchange/Space Exploration substack website
The water stained appearance in the upper right corner of the image is within the photographic emulsion, not on the photograph itself.
Interesting:
www.nasa.gov/history/alsj/a11/a11tether.html
Also interesting:
onlineonly.christies.com.cn/s/moon-shots-space-photograph...
Credit: Christie's website
Rain simulator in WSHD 310 Hydrology & Watershed Management lab. Students calculate rainfall volumes and runoff.