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u/Wrong_Hovercraft1767

r/AskPhysics r/AnalogRepair r/CanonAE1
Image 1 — Should my lens be more flush than seen here?
Image 2 — Should my lens be more flush than seen here?
Image 3 — Should my lens be more flush than seen here?
Image 4 — Should my lens be more flush than seen here?
▲ 4 r/CanonAE1+1 crossposts

Should my lens be more flush than seen here?

Hi---

New to film, friend gave me her old AE-1 as a gift.

I just mounted the lens and see that there's a bit of space as seen in the pictures. Is this normal? I googled and it says the lens should be flush against the camera, but there's definitely a small crack, don't know if this is within the tolerance.

This is the older kind of lens with the rotating gray ring. I'm also noticing that in demos using this kind of lens, they are able to rotate the ring to align the red dot with the metal pin on the inside, and then it locks into that place. Mine does not lock. I can rotate it to align, and then rotate it right back. Wondering if this is causing an issue?

Thanks in advance!!

u/Wrong_Hovercraft1767 — 12 days ago
▲ 17 r/AskPhysics

How "thick" is a light wave?

This is a question I've been struggling with a lot. I recently realized I had a significant misconception---the oscillating electric fields and magnetic fields that we say constitute light are oscillating in field strength, not spatially. I think this comes pedagogically from certain pictures that are drawn of light waves, and it's not immediately intuitive that the amplitude axes are in different units.

But now I'm realizing my spatial perception of a light wave is all wrong, and I'm stuck. In a microwave, what is being shot at my food? Is it an oscillating E-field and B-field that have wavelengths in the microwave region? Why is it that the little grid in the front doesn't let the "microwaves" come through?

If I shoot a laser pulse, how think is that light wave? Can I approximate it as a plane wave the thickness of the laser?

Sorry I don't know if those follow up questions help. If someone could help me get a better grasp on what a light wave actually is, that would be super helpful. Thank you!!!

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u/Wrong_Hovercraft1767 — 3 months ago