What's a "fixed" 2.8 lens mean?
Dec 4, 2023 09:34:57 #
BebuLamar wrote:
According to the instruction manual if you set the aperture at f/2.8 and focus to 1:1 the effective aperture is f/5.6.
It Stays at f/2.8 unless you change it yourself!!
Dec 4, 2023 11:02:29 #
tshift wrote:
It Stays at f/2.8 unless you change it yourself!!
The diaphragm doesn't change but the effective aperture changes because of the great extension to achieve 1:1 magnification. Check the manual. It's 2 stops lost of light.
Dec 4, 2023 11:19:00 #
BebuLamar wrote:
The diaphragm doesn't change but the effective aperture changes because of the great extension to achieve 1:1 magnification. Check the manual. It's 2 stops lost of light.
I think you are talking about a macro lens. I don't that is what this post is about??
Dec 4, 2023 13:04:11 #
I haven't read all seven pages, but here's what "fixed f/2.8" means. Unlike most zoom lenses, if you set the aperture to f/2.8 on a "fixed" lens, you will have that aperture no matter how far you zoom the lens. Many zoom lenses are described as, for example, "Aperture Range: f/5.6 to f/32." The farther you zoom, the smaller the aperture you get, as with the Nikon AF-S NIKKOR 200-500mm f/5.6E ED VR Lens. The f/5.6 is the largest aperture available, but that decreases as you move away from 200mm.
Dec 4, 2023 13:06:46 #
jerryc41 wrote:
I haven't read all seven pages, but here's what &q... (show quote)
At page 7, this is particularly unhelpful, as well as being technically wrong in most of the sentences and examples. You might want to go take some pictures and think about things before coming back to any of these 'technical discussion' posts ....
Dec 4, 2023 15:05:22 #
tshift wrote:
I think you are talking about a macro lens. I don't that is what this post is about??
Didn't you read the OP first post?
"Canon has a refurb RF 100MM fixed 2.8 macro lens for sale. What do they mean my fixed? Maybe I'm not up on new terminology. It wouldn't be the first time"
Didn't he said it's the RF 100mm fixed 2.8 macro???
Dec 4, 2023 16:35:36 #
jerryc41 wrote:
I haven't read all seven pages, but here's what &q... (show quote)
SO wrong!! I have the Nikon Nikkor 200-500mm f/2.8 and no it doesn't decrease as you zoom out to 500mm. Thanks BE SAFE!!
Tom
Dec 4, 2023 16:53:25 #
tshift wrote:
SO wrong!! I have the Nikon Nikkor 200-500mm f/2.8 and no it doesn't decrease as you zoom out to 500mm. Thanks BE SAFE!!
Tom
Tom
Does Nikon make the Nikkor 200-500mm f/2.8?
Dec 4, 2023 20:20:46 #
BebuLamar wrote:
Does Nikon make the Nikkor 200-500mm f/2.8?
Nikon makes a 200-500 F/5.6. If it was F/2.8 I probably couldn't lift it.
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Dec 4, 2023 21:49:36 #
BebuLamar wrote:
Does Nikon make the Nikkor 200-500mm f/2.8?
SORRY, my dumb ass. I guess I was thinking about what we were talking about. Yes it is f/5.6 Thanks BE SAFE!!
Tom
Dec 4, 2023 21:53:28 #
Bill_de wrote:
Nikon makes a 200-500 F/5.6. If it was F/2.8 I probably couldn't lift it.
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You are so right. The F/5.6 is heavy enough, I only shoot my sports with a monopod. Couldn't hand hold, at 72 years old I do well to do it with monopod. I shoot sports for Maxpreps.com. Thanks BE SAFE!!
Tom
Dec 5, 2023 06:11:16 #
tshift wrote:
SO wrong!! I have the Nikon Nikkor 200-500mm f/2.8 and no it doesn't decrease as you zoom out to 500mm. Thanks BE SAFE!!
Tom
Tom
Correct. That's why it's called an f/2.8. Regardless of the zoom range, it's always f/2.8.
For other lenses - Aperture Range: f/5.6 to f/32, Aperture Range: f/3.5 to f/22, Aperture Range: f/5 to f/22, Full-Frame | f/5.6-6.3 to f/32-36, Aperture Range: f/4.5 to f/40.
https://www.bhphotovideo.com/c/search?Ntt=Nikon%20Zoom%20Lens&N=0&InitialSearch=yes&ap=Y&gad_source=1&gclid=Cj0KCQiAsburBhCIARIsAExmsu6NVk0v_GuellpLJPfHAM8NfAuyJ5vkUafzgTcWTgfNkKHaduJrEz8aApmjEALw_wcB
Dec 5, 2023 06:17:18 #
CHG_CANON wrote:
At page 7, this is particularly unhelpful, as well as being technically wrong in most of the sentences and examples. You might want to go take some pictures and think about things before coming back to any of these 'technical discussion' posts ....
Once again, you are wrong, and I am right, but your "attacking" has maintained its traditional high quality.
https://www.canon-europe.com/pro/infobank/aperture/#:~:text=These%20terms%20apply%20to%20different,throughout%20the%20entire%20zoom%20range.
https://www.nikonusa.com/en/learn-and-explore/a/products-and-innovation/zoom-lens-maximum-aperture-fixed-and-variable-apertures.html
Dec 5, 2023 23:22:34 #
rzigmont
Loc: Olmsted Falls, Ohio
Good catch! I've caught stuff that camera shops list incorrectly on eBay or offer up, and corrected them. They thanked me.
Dec 6, 2023 15:54:44 #
mwsilvers
Loc: Central New Jersey
Bohica wrote:
The term fixed lense usually means the lens is not interchangeable. Most rangefinders came with a fixed 45 or 50mm fixed lens. for telephoto or wide angle you had to purchase auxillary lenses that screwed into the fixed lens. My Contessa LK has a Zeiss 50mm 2.8 fixed lens.
Actually, after searching online it appears the term "fixed" is used to describe three types of lenses.
1. Lenses that are not interchangeable.
2. Prime lenses.
3. Zoom lenses where the widest aperture does not change as they are zoomed in.
Sometimes you will also find better defined references such as fixed focal length or fixed aperture.
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