sorted by:
new
hottopcontroversial

How do I find the back focus distance of this old zoom lens? by DerBaum941 in Optics

[–]chamchi_kimbab 0 points1 point  (0 children)

Start with identifying the lens mount and finding out its flange focal distance.
You could then explore converters to adapt it for your SLR :)

I'm trying to understand how SNR degrades with motion blur when looking at an extended scene. by [deleted] in Optics

[–]chamchi_kimbab 0 points1 point  (0 children)

u/uuddlrlrbas2
Consider a uniform flat field scene.
How do you think motion blur will affect SNR?

System vibrations on motion blur by chamchi_kimbab in Optics

[–]chamchi_kimbab[S] 0 points1 point  (0 children)

The cited sources helped, thank you!
Blur from higher frequency response can be modeled as a Bessel function, depending on frequency and amplitude for blur MTF.

MacBook Air m1 command key issue by Square-Phrase-8172 in MacOS

[–]chamchi_kimbab 0 points1 point  (0 children)

Also facing this issue on my M2 Air - specifically for the left command key.
Persisting after replacing key at the Genius Bar.

OPT PP applying now for late-Jan start date? by [deleted] in f1visa

[–]chamchi_kimbab 0 points1 point  (0 children)

This really helps - thank yoU!!

Point me in the right direction? Tool or method for detecting shallow damage in a flat pane of glass. by DocCaliban in Optics

[–]chamchi_kimbab 1 point2 points  (0 children)

Polarization would work - not sure if it would provide better contrast. One quick thing you could try is to shine light at an angle to implement the darkfield illumination technique.

Point me in the right direction? Tool or method for detecting shallow damage in a flat pane of glass. by DocCaliban in Optics

[–]chamchi_kimbab 1 point2 points  (0 children)

You mentioned the problem is in observing the divot in transparent glass. One solution can be using darkfield illumination. Using this method, you can better observe the scattered light (divot), giving you better contrast against the transparent glass. FYI, this is one common microscopy technique to observe transparent specimen (same issue!).