24-105mm Canon L lens, darker when zooming in?
- Thread starter Solstice
- Start date
Yes it is. Because the lens have a variable aperture. So from 24mm (3.5) I think to 105mm (5.6).
You could set your aperture at f5.6 constantly to avoid the variability,
You could set your aperture at f5.6 constantly to avoid the variability,
Actually, the L series version of the Canon 24-105mm does not have a variable aperture but a fixed maximum aperture of F/4. You should have the same aperture at 24mm and 105mm.
To figure out your problem, first let's make sure you do have the L series lens and not the STM standard one, since the latter would behave the way mentioned in the previous posts.
To figure out your problem, first let's make sure you do have the L series lens and not the STM standard one, since the latter would behave the way mentioned in the previous posts.
You are using manual settings? Nothing automatic going on (including auto-ISO)?
How much does it change? If it's no more than 1/3 of a stop, that might be normal. If it's a full stop, that's borked.
Take a pic at f=24mm f/4 of a gray card, in manual settings and manual focus. Without moving the camera and using same settings, zoom in to 105mm and take another pic. Compare histograms. Does it change?
How much does it change? If it's no more than 1/3 of a stop, that might be normal. If it's a full stop, that's borked.
Take a pic at f=24mm f/4 of a gray card, in manual settings and manual focus. Without moving the camera and using same settings, zoom in to 105mm and take another pic. Compare histograms. Does it change?
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The Sigma ART 18-35mm (stunning lens btw) is a fixed f/1.8 - can't sing the praises of this lens highly enough - particularly when coupled with a Metabones Speedbooster (f/1.0!!!)
Do what stef said and post the results here with the metadata. Maybe one of the users here will recognize the issue.
What is the ballpark cost of this lens if I may ask?
It's somewhat affordable, but it's EF-S for canon. Maybe $800?
I don't think there's an EF-S to m43 speed booster, so you won't be getting F/1.0 without vignette.
Yeah, it's $800 list, so street price should be pretty decent.
http://www.sigmaphoto.com/product/18-35mm-f18-dc-hsm-a
Yeah, I use it with a Blackmagic Pocket with the Pocket Speedbooster - really awesome combo - I have a dumb m4/3 to Nikon adapter too so that one lens gives me a 28-105mm equivalent at a minimum of f/1.8 - very cool.
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I took some test shots. the 105mm shot doesn't seem as dark as I anticipated. But here are the results anyway. All shot in manual, iso 100, f4 and 1/500. No colour correction.
24mm, 24mm (cropped to match 105mm), and 105mm,
https://www.dropbox.com/sh/bmt42wy0jqh1eh0/AABCGwOQDexA48XUcjnIiFoca?dl=0
Link to the CR2 files,
https://www.dropbox.com/sh/710m367bybo9ubo/AABgraYzTvp0VH0pLYZey257a?dl=0
24mm, 24mm (cropped to match 105mm), and 105mm,
https://www.dropbox.com/sh/bmt42wy0jqh1eh0/AABCGwOQDexA48XUcjnIiFoca?dl=0
Link to the CR2 files,
https://www.dropbox.com/sh/710m367bybo9ubo/AABgraYzTvp0VH0pLYZey257a?dl=0
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Looking at the histogram and adjusting the color temp to match, the 105mm is almost exactly 2/10th stop darker. Some of that could be from vignetting, shot wide open, because I had to crop in the 24mm (so the darker edges would've been removed).
I'm not sure why it's darker. It might be one of the quirks of the lens.
The 70-200 2.8 V2 is something like 1/3 stop brighter than other lenses. It's kind of strange.
I'm not sure why it's darker. It might be one of the quirks of the lens.
The 70-200 2.8 V2 is something like 1/3 stop brighter than other lenses. It's kind of strange.
You do realize when the aperture is open wider and more light is let into the lens, the depth of field decreases? How much focus do you want on your subject and background are also taken into consideration. Watch the tutorial video I posted in my thread on the Canon 60D movie mode to adjust your shutter speed (light exposure settings) as well to adjust your light for the shot as well. http://www.indietalk.com/showthread.php?t=57565
If you are shooting indoors, you may also be able to add more light and take away light as you adjust your zoom with light sources such as adding and removing lamps into the subject area of your shoot.
If you are shooting indoors, you may also be able to add more light and take away light as you adjust your zoom with light sources such as adding and removing lamps into the subject area of your shoot.
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I have one Sigma lens and it is a wide angle telephoto. Unlike the Canon lens that I have for my 60D, the Sigma lens has a dial to adjust the F stop from 1:8 to 5:6. That is the way lens should be made. It makes the lens more flexable for a wider variety of shots. My two Canon lens come preset with a single F stop. Canon would do well to make all of their lens with adjustable F stops.
I think you may do well to read your camera manual… the ratio given on the front of the lens (e.g. 1:1.8 or 1:4) is the maximum aperture value, not the only one. You can adjust the aperture from the maximum usually down to f/22 or so (often to completely closed on a fully manual lens).
There is no indication on the lens itself on any adjustments or range of F stops on the lens itself to adjust the F stop like the Sigma lens has. An adjustable F stop lens will indicate its range on the lens itself.