lupi

Lupi

@lupi

cow of tailed snake (gay)

avatar by @citriccenobite

you can say "chimoora" instead of "cow of tailed snake" if you want. its a good pun.​

i ramble about aerospace sometimes
I take rocket photos and you can see them @aWildLupi

I have a terminal case of bovine pungiform encephalopathy, the bovine puns are cowmpulsory

they/them/moo where "moo" stands in for "you" or where it's funny, like "how are moo today, Lupi?" or "dancing with mooself"

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Starlink - 21/Oct/23

I tried an identical shot from an identical spot as last starlink (future moo insert link), to see what parts of my settings were wrong that time. upping the f number did not resolve the glare, unfortunately, though it did improve it, at the cost of losing other things.

photography folks, would putting on a polarizer or other filter help, perhaps? I have at least one tier of ND filter, I forget what strength it is.

it's weird that I haven't had a problem at all with the lens turned to 18mm but moving it to 24 causes that glare. I don't have enough of an understanding of things to quite grok why that would be, not yet anyhow.

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in reply to @aWildLupi's post:

darryl
@darryl

Just to make sure I’m on the same page: by “glare” are you referring to the brightness at the base of the rocket path, where the trail appears to get wider?

I don’t think a polarizer will make any difference, except that it would also act as a mild ND filter. I think the reflected flame would be somewhat polarized so the polarizer would work on it, but probably with varying effect as the rocket’s height changes (I’m somewhat guessing here, of course).

On the other hand I can’t see what adjusting the zoom works make a difference here. I know that as you adjust a zoom lens, the internal elements move around and that can cause different internal reflections and affect the appearance of lens flare, but that doesn’t look like what’s going here.

This looks like sensor saturation to me. If anything I would have guessed that zooming in would improve that, not introduce it, since the rocket now spends less time on any given pixel. It makes sense that a smaller aperture would help. Are you shouting at the same ISO setting as you normally do? That’s the only other thing I can think of.

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darryl
@darryl

Oh! Yeah that makes more sense. That does look like lens flare to me, but an atypical sort caused by the long exposure (as the point light source moves, the flare artifacts will also move). And the flare characteristics will certainly change as you zoom a lens in and out. Stopping down will reduce it because it reduces the amount of light entering the lens overall…

You could test this hypothesis by photographing e.g. a streetlight at night, positioned in the same place of the frame as the rocket would be, and then looking for what flare artifacts you get at different zoom levels. Unfortunately if that’s what it is then I think the answer is: that lens is just Like That 😐

You could also experiment with framing…is the posted image cropped? Flares normally occur somewhere on a line that passes between the light source and the centre of the frame, so where the rocket is in the frame (edge, centre, etc) will affect how the flare appears. (If this is an uncropped image I’m immediately less confident because I would expect it to look different…)

This is 100% guesswork though, please don’t mistake me for some sort of expert!

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