Can someone explain lens cast by aperture to me

Started 4 months ago | Discussions thread
Tons o Glass 0 Class
Tons o Glass 0 Class Contributing Member • Posts: 757
Re: Can someone explain lens cast by aperture to me

fferreres wrote:

Tons o Glass 0 Class wrote:

I've noticed this phenomenon after the fact (when processing RAWs and trying to match white balance), but nothing so drastic.

I only noticed on developing because one looks warm and loving, the other seems scary, ideal for a terror movie. I have never seen anything like it.

Might it just be the lens? It is curious that lens history specialist Marco Cavina was rather fascinated but the huge endeavor to give birth to it. It's quite complicated, almost overdone, for a simple 50/1.8.

Marco has even posted the materials and optical details, and materials for at least 5 of the 7 elements.

I've not a clue what happened in your shots, especially since I wasn't there observing the light. Looking at the timestamp there are 44 seconds between the two shots. On a windy partly cloudy day or during a sunrise/sunset 44 seconds is enough time for the light to change temperature and/or intensity.

There could have been thin clouds filtering some of the light, but both have direct sunlight and I actually have a stream of about 10 shots, 5 with each aperture setting (but some are more blurry).

Hmm... that eliminates changing light as the culprit enough in my mind.

What was the stopped down aperture?

I didn't take notes. Something like f8. Can we infer from the shutter speed change at least how many stops apart? I try to always use ISO 100, and used ISO 100 for both shots since the only bright part was quite bright, the baby tree.

Ah gotcha.  I may have to try this out on a similar scene for myself with my rough Singapore-made HFT Planar (the closest relative I own of your Rollei).

Would you be open to sharing the raw files to play with?

Yes, if anyone could share which place accepts RAW uploads. Would be nice for DPR to diversify and add a RAW upload service by a reasonable monthly fee, pivot from purely news and reviews to community of gear lovers.

Dropbox, Google Drive? Neither may be ideal but I believe they would work.

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Canon EOS 550D Sony Alpha NEX-3N A3000 Sony a7 II YI M1 +2 more
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