zoom in and refocus
Mar 10, 2023 04:19:01 #
ttheme
Loc: Florida
How do you explain that my friends.If i'm photographing a person and I zoom in on the face or eye, and then I zoom out, I will have a sharper image.
Mar 10, 2023 05:33:24 #
Mar 10, 2023 05:52:15 #
ttheme, you are asking a vague question with no details of what camera, no example images, how can you expect an answer???
Mar 10, 2023 05:57:32 #
ttheme wrote:
How do you explain that my friends.If i'm photographing a person and I zoom in on the face or eye, and then I zoom out, I will have a sharper image.
Most zooms today require you to refocus when you zoom.
If referring to a digital camera zooming in on the rear screen to magnify the subject to get a better focus then zooming back out on the screen, will generally produce a sharper image than not zooming in when focusing (manual focusing).
Mar 10, 2023 06:13:02 #
ttheme
Loc: Florida
dpullum wrote:
ttheme, you are asking a vague question with no details of what camera, no example images, how can you expect an answer???
Nikon D7200. Sorry Sir.
Mar 10, 2023 07:20:55 #
It would depend on the lens, not the camera. Most older push-pull zooms worked that way. You would zoom in, focus, then zoom out as needed and focus would hold. Most newer lenses with separate zoom collars will shift the focus as you zoom. So you need to refocus anytime you change focal length. Before auto focus became ubiquitous refocusing was impractical. So zooms were designed to hold focus. This may be part of why zooms are a lot sharper today, and rival their prime counterparts in many cases.
Mar 10, 2023 07:38:18 #
Mar 10, 2023 07:44:37 #
Mar 10, 2023 08:40:41 #
ttheme wrote:
How do you explain that my friends.If i'm photographing a person and I zoom in on the face or eye, and then I zoom out, I will have a sharper image.
Hopefully, your friend, or anyone receiving this advice, is looking at you like you don't know how to use your AF-capable equipment. No wonder you're having problems trying to explain this mistake.
Mar 10, 2023 10:24:07 #
Architect1776 wrote:
Most zooms today require you to refocus when you zoom.
If referring to a digital camera zooming in on the rear screen to magnify the subject to get a better focus then zooming back out on the screen, will generally produce a sharper image than not zooming in when focusing (manual focusing).
If referring to a digital camera zooming in on the rear screen to magnify the subject to get a better focus then zooming back out on the screen, will generally produce a sharper image than not zooming in when focusing (manual focusing).
Thaz THE version that works.
You cant trust latter day stills zooms to be really parfocal. Cinema zooms are actually parfocal which is why they cost 15 to 25 k$.
Mar 10, 2023 10:27:22 #
If you want a sharp image, use your selective focus setting and manually position your single AF point, on the eye ball, the eyebrow, the nose ridge, or wherever appropriate for the shooting distance and / or desired composition.
Ideas on how to consistently obtain sharply focused images with digital technology are discussed, described and demonstrated in this post:
How to obtain sharp images in digital photography
Ideas on how to consistently obtain sharply focused images with digital technology are discussed, described and demonstrated in this post:
How to obtain sharp images in digital photography
Mar 10, 2023 10:34:07 #
Tomfl101 wrote:
It would depend on the lens, not the camera. Most ... (show quote)
Internal cams were much more precise some decades ago, and only had to hold focus over a 2x or 3x range. Theres no difference between push-pull and twin ring lens. Thaz just the external ergonomics.
Oddly enough, I discovered that a cheap kit level current (3x) zoom is perfectly parfocal. It didnt require expensive finely machined cams cuz its done entirely electronically, thus its only parfocal if you keep a half press on the shutter button.
Acoarst even a "perfectly" parfocal cine zoom is always prefocused at the long end for the age old obvious reason.
Mar 10, 2023 10:42:15 #
ELNikkor wrote:
In the '80's, did that all the time with my trusty 43-86...
That was now but this is then :-(
Mar 10, 2023 10:54:47 #
User ID wrote:
Thaz THE version that works.
You cant trust latter day stills zooms to be really parfocal. Cinema zooms are actually parfocal which is why they cost 15 to 25 k$.
You cant trust latter day stills zooms to be really parfocal. Cinema zooms are actually parfocal which is why they cost 15 to 25 k$.
True. and as you point out, way beyond most peoples ability to afford.
Mar 10, 2023 11:54:10 #
Architect1776 wrote:
True. and as you point out, way beyond most peoples ability to afford.
Kinda like major earth moving machines, you rent it when you have work for it, rather than owning it. When you need something different for the next stage of the project then you simply rent that. You return the excavators and dozers and rent a paver and roller, etc etc.
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