How do constant aperture lenses REALLY remain constant?

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#aperture #photography #lens

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Опубликовано:

10 июл 2024

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Комментарии : 17

@DaveMcKeegan 2 года назад

Apologies for the glitches @4:30 - I had to re-render to amend an early part of the video and didn't notice this rendering glitch - thankfully it doesn't impact any important information

@oasean 2 года назад

Suggesting that McKeegan and I are like minds, this video is a surprise, a rare breed: pure information seemingly without practical application.

@TimvanderLeeuw 2 года назад

Hey, thanks for this video! I've been wondering about this for a while and I had suspected that one way of doing it would indeed be to just narrow down the aperture blades at wider focal lengths. I did not it could be done optically and you had a very effective demonstration of that! Great video.

@joaomarques7180 7 месяцев назад

Great video 🙏 thanks for the information

@JeffBourke 5 месяцев назад

I have wondered about this actually. Am I sacrifice aperture on the wide end for the illusion of constant aperture?

@faridtahmasebi1 Год назад

Thank you so much! finally I understood this concept!😁

@marcbeebe 2 года назад

That was an excellent and accurate explanation. Now as to whether or not anyone will listen and understand (or accept) it ...

@kevindiaz3459 2 года назад

And all this time I thought it was some kind of wizardry. SMH, mind blown! 😁 Thanks for the video Dave.

@AlexandarHullRichter 2 месяца назад

My sigma lens does not stop down the aperture to maintain 2.8 through the zoom range. I play with stuff, and it took me a moment to realize that's why my depth of field preview didn't do anything when I had it set to 2.8. Using the aperture to create the illusion of a constant f: is so stupid. Lots of people would pay more for a 1:1.8-2.8 instead of a constant 2.8, or a 1:3.2-5.6 instead of a 3.5-5.6 if they had the option!

@lucianoag999 2 года назад

Thank you very much! You basically made a video to answer my stupid comment. I appreciate it.

@DaveMcKeegan 2 года назад

There is no such thing as a stupid comment when dealing with sort of thing :)

@prestonkelly880 Год назад

Would you happen to know if there is a Sony E-mount wide angle zoom lens that exist that has any of these or similar specifications? 1.4 or 1.8 constant aperture, image stabilization, auto focus, etc.

@DaveMcKeegan Год назад

None that I'm aware of Only full frame wide angle zooms with stabilisation that I can think of are f4, or APS-C is f2.8 and not that wide And no zoom lens I can think of are faster than f2.8

@prestonkelly880 Год назад

@@DaveMcKeegan Ok, Thank you very much!