Large aperture lens and high ISO


Nikon123

New Member
Nov 28, 2004
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#1
Hi,

Beginner needs some advice.

With the newer DSLR which produces good images at high ISO, should I still buy large aperture lens like f1.4?

I heard that people buy large aperture lens mainly to take good pic at low light.

Thanks to the masters in advance.
 

Irvine

Senior Member
Jan 1, 2010
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#2
I heard that people buy large aperture lens mainly to take good pic at low light.
yes, that's one of the main points, but still u should know that wide apertures give u shallow dof, which is great for isolating the subject from the background (eg portraits).
 

mmeeoo

New Member
Jan 12, 2011
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#3
It depends on what is your subjects,
"good pic at low light" = clear and bright?
 

pasay

New Member
May 13, 2010
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#5
one of the main attractions of fast glass is that it CAN go to f1.4 or f1.8 should you need to. it can still go up to f4, f8, f16, but you cant say the same for kit (f3.5-5.6) lenses where f3.5 is the lowest you can go
 

Akatsuki

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Mar 2, 2008
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#6
there are just some things ISO cannot replicate like depth of field and subject isolation. if your a portraitist, large aperture lens are irreplaceable... whereas high ISO only gives a slight boost for your shutter speed in dark environment.
 

JJLoke

New Member
Aug 2, 2009
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#7
I have shot skate-boarders at night using f1.8 and high ISO.

I would say both are equally important.

Since the limit of my 450D is ISO1600, f1.8 comes in handy, allowing me to increase the shutter to reduce effects of handshake. However there will still be motion from the skate boarders at high speed.

If my ISO can go up to 6400, definitely my shutter can increase more, freezing the motion.
 

mmeeoo

New Member
Jan 12, 2011
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#10
I have shot skate-boarders at night using f1.8 and high ISO.

I would say both are equally important.

Since the limit of my 450D is ISO1600, f1.8 comes in handy, allowing me to increase the shutter to reduce effects of handshake. However there will still be motion from the skate boarders at high speed.

If my ISO can go up to 6400, definitely my shutter can increase more, freezing the motion.
why dont u use trigger flash :")
remember that 50mm@1.8 the DOF very thin, some cm.
 

Astroben

New Member
Aug 3, 2010
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#11
Even though they work hand in hand at times when required, i think we should still draw a small line between large apertures and ISO.

Eg when you go for portrait then yes it helps to get faster lens as larger apertures are still usable for portraitures.

But if you're a landscape guy and you're limited by max ISO 1600 cam capability at night, getting a large aperture lens might not help much if you set to lower f-stop. Only a little will be in focus. Probably you'll still end up at f/3.5 and above which your kit lens can also do the job
 

edutilos-

Senior Member
Dec 28, 2010
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#12
Nikon123 said:
Hi,

Beginner needs some advice.

With the newer DSLR which produces good images at high ISO, should I still buy large aperture lens like f1.4?

I heard that people buy large aperture lens mainly to take good pic at low light.

Thanks to the masters in advance.
It's good to have options.

Large aperture not just for low light, thinner dof can be useful to isolate subjects.
 

JJLoke

New Member
Aug 2, 2009
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#13
why dont u use trigger flash :")
remember that 50mm@1.8 the DOF very thin, some cm.
sure i could use flash but must also take into consideration of the skateboarders. They are practicing mid air stunts.

If i trigger flash, they can get disorientated and lose coordination, injuring themselve when they land.

I would rather get slightly lower pic quality and not to see injuries because of me. If its some dance then flash would be good.
 

#16
Hi,

Beginner needs some advice.

With the newer DSLR which produces good images at high ISO, should I still buy large aperture lens like f1.4?

I heard that people buy large aperture lens mainly to take good pic at low light.

Thanks to the masters in advance.
You get nice bokeh and shallow DOF with large aperture lenses, that what good ISO performance can't give you. :)
 

Shen siung

Senior Member
May 21, 2008
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#18
Akatsuki said:
there are just some things ISO cannot replicate like depth of field and subject isolation. if your a portraitist, large aperture lens are irreplaceable... whereas high ISO only gives a slight boost for your shutter speed in dark environment.
Yes agree. Some Large aperture lens will give good bokeh (but not always) which may favorable for portraits
 

Sep 17, 2008
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#19
It's good to have options.

Large aperture not just for low light, thinner dof can be useful to isolate subjects.
but downside is thinner dof, a little oof, ur whole image is gone. u get some leeway with smaller aperture. right?
 

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