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Author Topic: Aperture  (Read 725 times)

Offline Fitz

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Aperture
« on: June 27, 2020, 06:30:44 AM »

These two photos were taken at the same time, with identical lighting and zoom, and both from a tripod and using the camera's timer to eliminate camera-shake. Both were focused on the same point on the model. The only thing that changed between them was the lens aperture.

On the left, the aperture was f22, on the right, f5.6.

Each of them has their benefits.

The smaller aperture (f22) increases the image's depth of field, so every part of the model is in focus. The background texture is also better defined. The exposure time is long, so a tripod is absolutely necessary.

the larger aperture (f5.6) reduces the depth of field, so the background is significantly out of focus — this has the benefit of separating the model from its background, and the fact that his left hand is also slightly out of focus gives the figure a bit more of a sense of depth. Exposure time was significantly shorter, but still long enough to make tripod use advisable.

The miniature is from Reaper; I think it's a swamp-troll or something.

Offline Ragnar

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Re: Aperture
« Reply #1 on: June 27, 2020, 08:05:01 AM »
I struggle to remember this stuff so thanks for this.

Doesn't lengthening the aperture time increase the amount of light coming in thereby over exposing the image? 
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Offline Fitz

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Re: Aperture
« Reply #2 on: June 27, 2020, 12:54:19 PM »
Doesn't lengthening the aperture time increase the amount of light coming in thereby over exposing the image?

No, because the smaller aperture allows less light in to begin with — to get the same amount of light overall, with a smaller aperture (that's a bigger f-stop number) you have to increase the exposure time, while with a larger aperture (a smaller f-stop number) you have to decrease exposure time.

It's a balancing act between aperture and exposure. It's mostly handled automatically these days, though any decent camera will allow you to manually adjust the aperture/exposure balance.

Offline Ragnar

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Re: Aperture
« Reply #3 on: June 27, 2020, 09:06:04 PM »
Thanks for the detailed reply.

Offline Thargor

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Re: Aperture
« Reply #4 on: June 27, 2020, 09:24:43 PM »
Also worth remembering that the depth of field is affected by the distance between the camera and subject... the closer you are the shallower the depth of field.

There is a formula for it that I've never bothered to learn, but something to think about when photographing groups of figures.

Online Plynkes

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Re: Aperture
« Reply #5 on: June 27, 2020, 09:41:17 PM »
The camera I use has a function where you set the depth of field you want and it automatically calculates the exposure time. I have not as yet inquired of the manual about how to separately set the aperture value and the exposure time as mentioned above, as the automatic function has always been satisfactory so far. It's the best method I have discovered with this camera for taking group shots, so as to avoid that thing where one figure is in perfect focus and the rest are slightly out of focus. It has the added bonus that you can take nice pics of minis with ambient lighting (it can take pretty nice pics even in quite low light, it just takes forever to do it), thus avoiding the need for a complicated lighting set-up.

Tripod and either a remote or the timer function are mandatory for doing this, though. Even the vibration caused by pressing the button on the camera is enough to ruin such a shot due to the long exposure times required.

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Offline scatterbrains

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Re: Aperture
« Reply #6 on: July 13, 2020, 02:00:27 PM »
The camera I use has a function where you set the depth of field you want and it automatically calculates the exposure time.

Would that be the Aperture Priority mode?

Online Plynkes

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Re: Aperture
« Reply #7 on: July 13, 2020, 02:10:09 PM »
Yes. The little book calls it Aperture-Priority AE. On the camera dial where you actually select the mode this is abbreviated to AV (Aperture Value). Slightly confusing, but I guess they knew what they meant when they did it that way.



Offline Hammers

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Re: Aperture
« Reply #8 on: August 05, 2020, 09:04:21 AM »
All good stuff.

Offline Norm

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Re: Aperture
« Reply #9 on: August 20, 2020, 09:51:51 PM »
For that shot I would be inclined to go to f11 and pull the camera further back and then crop later.