Equivalent focal length - a more correct way to compare
Mar 31, 2024 01:35:10 #
a6k wrote:
Wrong. They affect ability to crop for small distant subjects.
Missing the point completely.
Mar 31, 2024 10:06:02 #
SuperflyTNT wrote:
I have no issue with User ID. He made a valid point. Jeez. I guess that means he’s also ignoring UHH sacred traditions.
The bozo who wrote that will sometimes post inuendo that we two are one person running two accounts ... but hes typically inconsistent in his "logic". Basically hes just kinda grumpy and humorless. This is an entertaiment site and seems to thrive on having a wide cast of typecast players, so he has a specific role in the overall success of the site. UHH rolls on.
Mar 31, 2024 10:08:20 #
Bruce T wrote:
But depth of field is important. If you want a very shallow depth of field, you need a fast lens…f/1.2,f/1.4. If you want everything in focus you can use a f2/8 or f/5.6 lens and set it at f/8 for your shot.
DOF is sometimes important. I don't see how a fast lens has anything to do with DOF.
DOF is controlled mostly by lens mm, distance to subject, f stop
Mar 31, 2024 10:27:49 #
User ID wrote:
The bozo who wrote that will sometimes post inuendo that we two are one person running two accounts ... but hes typically inconsistent in his "logic". Basically hes just kinda grumpy and humorless. This is an entertaiment site and seems to thrive on having a wide cast of typecast players, so he has a specific role in the overall success of the site. UHH rolls on.
That’s the only reason I engage him. I feel it’s a duty of my role here.
Mar 31, 2024 10:29:13 #
frankraney wrote:
DOF is sometimes important. I don't see how a fast lens has anything to do with DOF.
DOF is controlled mostly by lens mm, distance to subject, f stop
DOF is controlled mostly by lens mm, distance to subject, f stop
Well “fast” means a wider f stop. Seems pretty straightforward to me.
Mar 31, 2024 10:34:09 #
frankraney wrote:
DOF is sometimes important. I don't see how a fast lens has anything to do with DOF.
DOF is controlled mostly by lens mm, distance to subject, f stop
DOF is controlled mostly by lens mm, distance to subject, f stop
Fast lenses give you shallow depth of field. Today it's about the only reason to have fast lens. Imaging sensor can do so well at high ISO that fast lenses for more light isn't needed any more.
Mar 31, 2024 11:07:58 #
SuperflyTNT wrote:
Well “fast” means a wider f stop. Seems pretty straightforward to me.
Completing the concept for the noobs among us: Wider apertures allow more light to hit the sensor or film, so you need less time to complete the exposure. A shorter open shutter interval is described as a faster shutter speed. So a "fast" lens is one with a wide aperture that allows a "faster shutter speed." "Faster shutter speeds" stop faster action or action closer to the camera.
The lens itself isn't fast or slow. It just exists and lets a specific maximum amount of light through. But we describe it with shorthand when we compare... with a specific intent in mind.
There was an old pro at the camera store I dealt with in the 1970s who explained concepts like this to new customers. He deconstructed all the terminology and explained where it came from. When you know the WHY, the what to do or not do becomes obvious (to most people).
Mar 31, 2024 11:58:54 #
SuperflyTNT wrote:
Well “fast” means a wider f stop. Seems pretty straightforward to me.
True, but it is only one component for DOG. it also is used for a faster shutter speed. And a longer lens can give shallower DOF ( just have to be careful with compression). A fast lens let's more light in and allows for a faster shutter speed. The three things I mentioned control DOF more than a fast lens.
Mar 31, 2024 13:09:59 #
Retina
Loc: Near Charleston,SC
jerryc41 wrote:
This seems to be a very contentious topic. I wish... (show quote)
The proportion of camera buyers who know what FL means using a 35mm film camera will decrease. When 35mm film cameras are seen mostly on museum shelves and later generations ask what is meant by filming a scene or taping a conversation, I wonder if the equiv. FL for any non-FF camera will also lose its significance altogether. Maybe it will be replaced by the angle or range in degrees in the field of view or something else not tied to a historical standard.
Mar 31, 2024 13:25:39 #
Retina wrote:
The proportion of camera buyers who know what FL means using a 35mm film camera will decrease. When 35mm film cameras are seen mostly on museum shelves and later generations ask what is meant by filming a scene or taping a conversation, I wonder if the equiv. FL for any non-FF camera will also lose its significance altogether. Maybe it will be replaced by the angle or range in degrees in the field of view or something else not tied to a historical standard.
As it should be stated in the beginning. Stating the actual focal length of the lens, the size of the sensor and perhaps the angle of view is much better than 35mm equivalent focal length.
Mar 31, 2024 18:59:19 #
a6k wrote:
I used two cameras+lenses: br br Sony 𝜶6500 with... (show quote)
Well your comparison isn't right. I am looking for someone with a Nikon Df and D850. Using the same lens and do your test. You will see the 2 cameras which have same size sensor using same lens the size of the subject is much different when you do a 100% zoom in editing software.
Mar 31, 2024 19:41:39 #
frankraney wrote:
True, but it is only one component for DOG. it also is used for a faster shutter speed. And a longer lens can give shallower DOF ( just have to be careful with compression). A fast lens let's more light in and allows for a faster shutter speed. The three things I mentioned control DOF more than a fast lens.
I’m not sure if you’re just dense or being disingenuous. A fast lens lets more light in specifically because it has a larger aperture and that larger aperture is the #1 thing for shallow depth of field.
Mar 31, 2024 19:44:34 #
BebuLamar wrote:
Well your comparison isn't right. I am looking for someone with a Nikon Df and D850. Using the same lens and do your test. You will see the 2 cameras which have same size sensor using same lens the size of the subject is much different when you do a 100% zoom in editing software.
Could it be because the df is a ff camera and the 850 is a dx, ff vs crop sensor? And what is the lens made for?
Same size Sensor in what, pixels?
Mar 31, 2024 19:51:02 #
frankraney wrote:
Could it be because the df is a ff camera and the 850 is a dx, ff vs crop sensor? And what is the lens made for?
Same size Sensor in what, pixels?
Same size Sensor in what, pixels?
No both are FX (FF). The difference is that the Df is only 16MP and the D850 is 45MP. Any Nikon F mount lens it doesn't matter. Just use the same lens.
Take a picture with each camera. Same distance from camera to subject. Same lens. display both in PS and zoom to 100%. The subject in the D850 image is 1.7 times the one from the Df.
Mar 31, 2024 19:57:19 #
SuperflyTNT wrote:
I’m not sure if you’re just dense or being disingenuous. A fast lens lets more light in specifically because it has a larger aperture and that larger aperture is the #1 thing for shallow depth of field.
What was stated was a fast lens was needed to control DOF. As I stated (and it is correct) DOF is controlled by, lens mm, apperature, and distance to subject.
I also stated a fast lens let's more light in, allowing for faster shutter speed. Can you get a shallow DOF with one, yes, but it is only one component, but not necessary, a shallow DOF can be had at lower apertures,
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