fixed aperture zoom

nivek535 · Jan 18, 2015

hi there

! (an inactive newbie here!)
I have a question about zooming with fixed aperture.

i know that the widest aperture for zoom lenses (most) are fixed by the focal length you're at,
but for example, if i use a 18-55 3.5-5.6 lens and use f5.6,
why cant i zoom from 18 to 55 keeping it fixed at 5.6?
my camera is D3200.

thanks

!

WalterB · Jan 19, 2015

at 5.6 it should be possible. Just set it to 5.6.

At 3.5 (or anything below 5.6) it is mpossible.

nivek535 · Jan 19, 2015

hey thanks for the reply, but that is exactly my question

!
Why is it not working

?

I am on M, video mode.
zoomed out (18mm), set aperture to F/5.6.
when i zoom in to 55mm, the aperture changes to F/9.x or something

.....

WalterB · Jan 19, 2015

That's weird.
I'm not familiair with Nikon, but maybe someone else knows what could be the problem...

nivek535 · Jan 28, 2015

i figured out a solution!
using aperture priority and locking exposure

gpforet · Jan 30, 2015

Might want to ensure that the camera is not changing your shutter speed or ISO. Typically aperture priority will auto adjust shutter or IS0 to keep exposure constant.
.

nivek535 said:
i figured out a solution!
using aperture priority and locking exposure

nivek535 · Feb 28, 2015

gpforet said:
Might want to ensure that the camera is not changing your shutter speed or ISO. Typically aperture priority will auto adjust shutter or IS0 to keep exposure constant.
.

oh yea, i had to point the camera around until i had the right shutterspeed before locking it

fixed aperture zoom

nivek535

WalterB

nivek535

WalterB

nivek535

gpforet

nivek535