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11 questions
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2 votes
2 answers
75 views

Do non-constant aperture zoom lenses vary aperture when zooming, when the aperture is not set to wide-open?

I am an experienced amateur photographer and videographer using a Sony a7sII with a Sigma 28-300mm f3.5-6.3 hyperzoom lens for a music video shot. I notice that when I test the shot zooming out all ...
smashing_syntax's user avatar
smashing_syntax
  • 21
1 vote
1 answer
1k views

Why does aperture change when I zoom my lens even in manual mode? [duplicate]

I have my Nikon D7500 set to Manual Mode. I can change the shutter speed and it maintains the setting. When I change the aperture, the setting is not maintained and varies depending on the zoom of ...
lestat1978's user avatar
lestat1978
  • 11
2 votes
3 answers
357 views

From a user perspective, is a stopped down variable aperture zoom lens equivalent to a constant aperture zoom lens?

Let's say that I have a 24-70 F3.5-4.8 variable aperture zoom lens. If I were to stop down that lens to 4.8, would it then be equivalent to a 24-70 F4.8 constant aperture zoom lens from a user ...
Speldosa's user avatar
Speldosa
  • 131
0 votes
2 answers
287 views

zoom or aperture which one decreases DoF?

When I want to decrease my DoF and have Bokeh in my photos, I always stuck between choosing either opening the aperture or zooming. Should I start zooming or should I decrease the aperture? Edit: I'...
Andrew Ravus's user avatar
Andrew Ravus
  • 163
15 votes
3 answers
2k views

How do zoom lenses restrict their widest aperture at the telephoto end?

Does the aperture ring lock the apertures beyond, say 5.6 at length lens's telephoto end? Does the lens introduce an obstacle to the aperture ring so the lens can't be opened anymore beyond the ...
user152435's user avatar
user152435
  • 1,515
2 votes
1 answer
969 views

Why don't all zoom lenses have variable f-numbers? [duplicate]

As I understand it, the f-number is a ratio between the focal length and the aperture diameter. A zoom lens can change focal length, but shouldn't the maximum aperture be a fixed size? If so, that ...
Brendan Abel's user avatar
Brendan Abel
  • 123
40 votes
2 answers
10k views

Why no zoom lenses with a maximum aperture wider than f/2.8?

I can understand that a zoom lens with a maximum aperture wider than f/2.8 would be difficult and costly, but it seems like something pros would kill for. Surely it can't be more expensive (if its ...
rfusca's user avatar
rfusca
  • 26.5k
10 votes
3 answers
2k views

What is the technical name for a zoom lens which has a fixed maximum aperture?

What is the technical name for a lens which has the same maximum aperture throughout the entire zoom range?
Aquarius_Girl's user avatar
Aquarius_Girl
  • 5,612
22 votes
2 answers
5k views

Why do zoom lenses and compact cameras have varied maximum aperture across the zoom range?

Why does a camera's maximum (allowed) aperture get smaller when you increase its zoom?
William C's user avatar
William C
  • 641
7 votes
4 answers
2k views

Is depth of field and bokeh influenced by distance to the subject?

I know that the aperture size has a direct effect on the depth of field. However, what about distance to the subject? Let's say I took two pictures, one at 24mm and one at 70mm, using the same lens ...
Daniel T.'s user avatar
Daniel T.
  • 1,827
46 votes
7 answers
14k views

How do constant aperture zoom lenses work?

Cheaper zoom lenses usually are faster at the wide end and slower at the long end (for example, the $150 Canon EF-S 18-55mm f/3.5-5.6). More expensive constant-aperture zoom lenses have the same ...
Ken's user avatar
Ken
  • 5,088