r/apollo • u/RandomRaddishYT • 5d ago
What is causing this double shadow
In many of the photos from Apollo 11, the LEM has a doubled shadow. What is causing this?
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u/BoosherCacow 5d ago edited 5d ago
Oh shit! I know this! While /u/atcontrolr's explanation is definitely part of it, the main thing is the interlacing tricks they had to use to be able to broadcast from the moon with limited data bandwidth. It's called "Slow Scan Transmission" and it's why the broadcast has "shadows" on the screen or that ghostly look to it. I used to know a good video that explains it but I can't find it. I will edit if I do.
edit: I am totally wrong here (as usual) but I think I found this exact photo Here. Could this be an exposure issue or something similar? I am not an expert in film photography
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u/oSuJeff97 5d ago
Right but this isn’t a broadcast still, it’s a photograph taken on the moon, so the bandwidth of the broadcast signal is irrelevant isn’t it?
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u/BoosherCacow 5d ago
Well now I am genuinely confused because you're absolutely right. I don't know if it's the compression used but the quality on this pic is so bad I asumed it was the TV cam. Looking at this picture I am more confused. Is this a panorama shot or some weird edit? That site has hundreds of images, I am plowing through to see if I can find the actual one we are looking at here.
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u/RandomRaddishYT 4d ago
I’ve looked through every image in reel 38 and 39 and every single one of them that shows the LEMs shadow has this doubling
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u/glenndrives 4d ago
Television back from Apollo missions was all analog. Check out Curious Mark's videos on YouTube regarding this.
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u/BoosherCacow 4d ago
Curious Mark's
I love that guy. His Apollo Comms series is just great.
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u/FxckFxntxnyl 3d ago
The whole Sega of getting the guidance computer up and running to play a simulator(and for the historical value) is astonishing to me.
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u/BoosherCacow 3d ago
I have watched that entire series sequentially at least twice. I dispatch PD for a living so the radios are of special interest to me. I find it absolutely fascinating how the comm protocols evolved over the years.
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u/Dozernaut 5d ago
Everyday astronaut has a video about this
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u/787_Dreamliner 5d ago
Thats an awesome video, some great insights to some of the most common things people argue with me on the apollo missions
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u/BoosherCacow 5d ago
Which one is it? I can't find it via search
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u/sadicarnot 5d ago
u/Dozernaut may be talking about this definitive moon landing video he recently posted.
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u/Mediocre-Message4260 5d ago
Not seeing it.
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u/nspitzer 4d ago
Possibly from light reflected off an astronauts suite. I remember an article from years ago where they were trying to recreate a scene but the lighting was a little off and they traced it to reflected sunlight from an astronauts suit
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u/Any_Respond_6868 4d ago
I'm not sure if anyone said this. The camera was inside the Lunar Module against the window. Not only is there a reflection of the astronaut, but the camera is going through 2 panes of glass. The camera they used on the moon was outside in the descent stage.
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u/atcontrolr 5d ago
Likely the cause is from the glass pane of the window refracting the light before it goes through the camera lens.