Apertur-Stacking

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Guppy
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Joined: Mon Dec 20, 2010 10:36 am
Location: Switzerland
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Apertur-Stacking

Post by Guppy »

In enlarging photography, sometimes a smooth sharpening process with maximum resolution in the focal plane is desired.

For example, if aperture 2.8 is the highest resolving aperture, the depth of field is very shallow,
with aperture 22 the depth of field is large, but the resolution in the plane of focus is poor.
One way to achieve maximum resolution in the focal plane and still maintain a smooth focus is aperture stacking.

Image
http://files.homepagemodules.de/b649264 ... kesnjd.jpg

Here I used the Laowa 25mm F 2.8, 2.5-5X Ultra Macro, with an image scale of 4.5:1. Camera: Nikon D810
The beetle is a large tropical weevil (Eupholus magnificus).

Image series, aperture and flash steps:
F-stop 2.8, flash power 1/128
F-stop 3.2, flash power 1/107
F-stop 3.6, flash power 1/85
F-stop 4.0, flash power 1/64
F-stop 4.5, flash power 1/53
F-stop 5.0, flash power 1/43
F-stop 5.6, flash power 1/32
F-stop 6.3, flash power 1/27
F-stop 7.1, flash power 1/21
F-stop 8.0, flash power 1/16
F-stop 11.0, flash power 1/8
F-stop 16.0, flash power ¼

This series of 12 images was stacked with Zerene Stacker.

That's it.


Image
Image with f-stop 2.8, maximum resolution, low depth of field.

Image
Image with f-stop 22, low resolution, high depth of field.

Aperture stacking can be combined with focus stacking as required.

Kurt

dolmadis
Posts: 737
Joined: Wed Dec 07, 2011 1:51 pm
Location: UK

Re: Apertur-Stacking

Post by dolmadis »

Guppy wrote:
Wed Sep 16, 2020 3:46 am

Aperture stacking can be combined with focus stacking as required.Kurt
I am struggling with this one and would welcome an example of how the two techniques can be deployed together and the benefit.

Thanks

John

Guppy
Posts: 141
Joined: Mon Dec 20, 2010 10:36 am
Location: Switzerland
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Re: Apertur-Stacking

Post by Guppy »

Here with this beetle you could extend the highest resolution range of the eye a bit with a focus stack at f-stop 2.8,
then the area around the eye would be sharper.

Kurt

dolmadis
Posts: 737
Joined: Wed Dec 07, 2011 1:51 pm
Location: UK

Re: Apertur-Stacking

Post by dolmadis »

Thanks for explaining how DOF stacking and Focus stacking can be combined.

I note that you have varied the flash output between aperture settings so that light exposure remains as constant as possible.

I assume that these are manual flash settings.

Do you think that the Aperture Priority could also be used thus auto changing shutter speed and ISO to maintain constant exposure in a setting?

Best


John

Guppy
Posts: 141
Joined: Mon Dec 20, 2010 10:36 am
Location: Switzerland
Contact:

Re: Apertur-Stacking

Post by Guppy »

Hello John

It can also be done with automatic exposure, both by changing the exposure time and by changing the sensitivity (ISO).
Actually it is very simple and clean.

Kurt

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