Is aperture impt for High Power-Zoom lense?


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Jan 2, 2009
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#1
something like 70-300mm kind? is it impt to have good aperture for those lense..

for example: AF-S VR 70-300mm f/4.5-5.6G IF-ED but its only f/4.5-5.6G...
 

giantcanopy

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Feb 11, 2007
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#2
The lenses with a large zoom ratio are the ones that comes with smaller variable apertures.
It will be too heavy, bulky, and expensive to construct them with a constant aperture.

The better quality professional zooms generally have a smaller zoom ratio, such as the 70-200mm f2.8

So you will have to see if you need a larger aperture after all.

Ryan
 

Apr 15, 2008
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#3
depends on your needs and your budget? :)

a faster lens'll allow you to capture fast subjects in dim condition and will also render nice bokeh in the OOF regions ;p
 

zac08

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Feb 21, 2005
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#4
something like 70-300mm kind? is it impt to have good aperture for those lense..

for example: AF-S VR 70-300mm f/4.5-5.6G IF-ED but its only f/4.5-5.6G...
Well, why are you looking at a long lens?

You want to shoot animals or sports? Think about it. Would you need the fast focusing speed that a larger aperture lens will afford? Would you need to shoot in low light conditions (or mebbe even overcast)?? Can you afford to increase the ISO to compensate?

If you need LOW ISO, larger aperture, and fast speed, then you have your answer.

But if you can accept high ISO shot, having a slower lens, stopping down to compensate for the slight softness, etc... then no issues.
 

Jan 2, 2009
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#5
summary = if not shooting fast moving object, no need big aperture for zoom lense?
think i got it THANKS!
 

zac08

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Feb 21, 2005
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#7
summary = if not shooting fast moving object, no need big aperture for zoom lense?
think i got it THANKS!
Wrong summary.

Having a large aperture lens also allows u to isolate a subject better with nicer bokeh.... Think about the things again slowly.
 

Jan 2, 2009
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#8
I initially oso tot about the bokeh effect thingy...

but after i read this remark, i am confused...

then does it have to do with these remark "a faster lens'll allow you to capture fast subjects in dim condition"

need enlighten...
 

thenomad

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Nov 17, 2008
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#9
I initially oso tot about the bokeh effect thingy...

but after i read this remark, i am confused...

then does it have to do with these remark "a faster lens'll allow you to capture fast subjects in dim condition"

need enlighten...
A faster lens means larger aperture.
Larger aperture means more light will get in.
More light get in means your shutter speed will be faster.
Faster shutter speed means fast subjects can be captured without motion blur.

If your subject is not moving, you don't need such a large aperture.
But, still depends on the available light.
If it's too dark, you may still get blurred images because of camera shake.
Why? Because less light means slower shutter speed.
Slow shutter speed means your camera shake is more visible.
 

Jan 2, 2009
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#10
A faster lens means larger aperture.
Larger aperture means more light will get in.
More light get in means your shutter speed will be faster.
Faster shutter speed means fast subjects can be captured without motion blur.

If your subject is not moving, you don't need such a large aperture.
But, still depends on the available light.
If it's too dark, you may still get blurred images because of camera shake.
Why? Because less light means slower shutter speed.
Slow shutter speed means your camera shake is more visible.
does it has the same meaning as this remark "summary = if not shooting fast moving object, no need big aperture for zoom lense?" :dunno:
 

weixing

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Feb 1, 2005
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#11
Hi,
Basically, a faster lens (bigger maximum aperture) allow more light in compare to a slower lens (smaller maximum aperture). So
1) a faster lens allow you to use a faster shutter speed compare to a slower lens at the same lighting condition and same ISO.
2) or a faster lens allow you to use a lower ISO compare to a slower lens at the same lighting condition and same shutter speed.
3) or a faster lens allow you to shoot at a dimmer lighting condition compare to a slower lens using the same ISO and same shutter speed.

Have a nice day.
 

weixing

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Feb 1, 2005
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#12
Hi,
does it has the same meaning as this remark "summary = if not shooting fast moving object, no need big aperture for zoom lense?" :dunno:
It's all about lighting. If there is enough light, you don't need to use a fast lens to shoot a fast moving object.

Have a nice day.
 

Eugon

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Feb 3, 2009
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#14
Does one define faster lens by looking at the f3.5 ~ 6.3 (smaller numeric the faster it is?)
Thanks
 

HaimE

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Oct 15, 2008
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#15
Does one define faster lens by looking at the f3.5 ~ 6.3 (smaller numeric the faster it is?)
Thanks

Aperture goes the other way round.. the smaller the number = more light = faster lens. example f3.5 is fater than f6.3.
example F1.4 is faster than f3.5

goes back to TS topic..

i still think it all depends on what you are wanting to snap. Topic : Is aperture impt for High Power-Zoom lense? answer is yes and no..

But to have a faster lens (any lenses ) is an advantage.. cos it can cover almost anything of the both world. In low light or even strong bright light. Im sure if any photo enthusiast would be given a choice to choose between a f2.8 lens and f3.5-6.3 lens.. they will grab the f2.8 lens.

-peace-
 

Eugon

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Feb 3, 2009
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#16
Assuming the object is a walking person from a distance. Weighing both lenses does the higher range(18-270mm) has an advantage over the shorter range eventhough the f. is lesser?
 

zac08

Senior Member
Feb 21, 2005
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#17
One major issue also...

size of lens. At the zoom focal lengths, we're used to, they are not too bad yet, but there is a Hefty difference from a 70-210 f4-5.6 vs a 70-200 f2.8 lens...

So you'd need to know that there is going to be a weight and size difference for you to capture more light.

And at longer focal lengths, this is just getting even bigger. If you have seen a 300mm f2.8 lens, you'll understand why it's not used commonly, too BIG and hard to use handheld. :sweat:
 

zac08

Senior Member
Feb 21, 2005
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#18
Assuming the object is a walking person from a distance. Weighing both lenses does the higher range(18-270mm) has an advantage over the shorter range eventhough the f. is lesser?
Sorry I dun get your query...

can u re-phrase it clearly.
 

Snoweagle

Senior Member
Jan 26, 2005
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#19
something like 70-300mm kind? is it impt to have good aperture for those lense..

for example: AF-S VR 70-300mm f/4.5-5.6G IF-ED but its only f/4.5-5.6G...
What do u want to take with this lens? In the 70-300 range, all the apertures are similar and that goes for other brands. If u want a larger constant aperture then take the 70-200 f/2.8.

If u're using this lens mostly for events under normal indoor lighting, it's sufficient.
 

Jan 20, 2009
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#20
i'd been thinking of this question myself for days...
i tink i've a conclusion.

shooting in high power zoom lens, f4-5.6 is sufficient for me. reasons due to budget and the weight and size.
u wouldn't want to hug a heavy lens every time ya?

tamron 70-300mm is my 1st choice. its cheap and just great zoom. you can see sample pictures from flickr .

its more likely i'll use it in bright daylight than at night. since our visions at night aren't any good either. and since we're using it in bright daylight, we'll be shooting in high shutter and thus IS is not so critical.

in case you're using it for night shots, long exposure without tripod will cause blur images whether you hv IS or not. and flash will not travel that far (300mm), which makes it another reason not to use it for night shots (although 70mm seems acceptable, but my kit lens can do better).

so yea. thats my answer.
 

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