I somehow see this a lot.. or am I mistaken? :)

Nope. You do see a lot of it. Fast lenses, giving you more versatility with your shot selection.

avantange is its big openning ...good for shallow depth of field ,good for low lighting,cool color,and very good for sports...very expenssive lense 2.8L for 70 to 200 and the 1.8 for 24 to ? ....no need flash...the bigger the openning many lights well enter into the lense the smaller openning smaller lights well inter into the lense thats why we need slower shuttle speed if its low light ,but all the enviroment in the picture are sharp very good depth of field

the bigger the aperture (lower aperture number), the closest to how the human eye captures light I think? with 1.0 aperture approximately equal to the human eye's capacity to see in the dark "yata".

yup !!!!thats way we need to slow down if its dark....its the same with the cam...if its dark and u dont want to use flash, slow the shutter speed to record the lights

okay for low light. fast lenses.

The f/stop value is a ratio between the diameter of the physical size of the lens opening and the focal length of the lens. Although the aperture does mimic how the pupil of the eye works, I don't think that you can necessarily equate an aperture of f/1.0 to how the eye can see in low light situations. :D

Lenses with big maximum apertures are also called fast lenses because they allow you to use faster shutter speeds.

"The bigger the aperture, the faster the shutter speed. The smaller the aperture, the slower the shutter speed." This often quoted phrase is the reciprocal relationship between the aperture and the shutter speed.


the bigger the aperture (lower aperture number), the closest to how the human eye captures light I think? with 1.0 aperture approximately equal to the human eye's capacity to see in the dark "yata".

..but some lenses, mostly third party, are too soft @ 2.8 then your forced to shoot at smaller aperture to get to a specific sharpness. just like my tamron 28-105 f2.8 it's so soft i had to shoot at small openings - so why did i get the 2.8 in the first place:Shock:

Which is why some photographers prefer to shoot at an f/stop setting that is at least two stops smaller than their maximum aperture :D



..but some lenses, mostly third party, are too soft @ 2.8 then your forced to shoot at smaller aperture to get to a specific sharpness. just like my tamron 28-105 f2.8 it's so soft i had to shoot at small openings - so why did i get the 2.8 in the first place:Shock:

I somehow see this a lot.. or am I mistaken? :)

For low-light shooting. more pleasing background blur, heavier lens, bigger glass, and bigger holes in our pockets.

f/2.8 lenses allow the camera to capture twice the amount of light than an f/4 lens.
So for example you are shooting a subject in low light and your camera's exposure meter is set to 1/30s @ f/4, you can shoot at double the shutter speed with an f/2.8 lens i.e. 1/60s @ f/2.8 using the same ISO settings.

everybody loves 2.8 lenses :D

everybody loves 2.8 lenses :D

I'll just add to what Dexter stated:

"Everybody loves sharp, professionally built and constant aperture f/2.8 lenses." :Grin:

what's with f2.8? - shallower DOF :D

I'll just add to what Dexter stated:

"Everybody loves sharp, professionally built and constant aperture f/2.8 lenses." :Grin:

yup yup once you go fast its hard to go back. but honsetly speaking earl naninibago ako sa f2.8 you know all my other lenses were sub f2:)

wow! thanks ulit sa mga reply nyo.. I somehow understand na..

next question is, why not go bigger/faster (1.8 or 1.4 or meron pa bang mas malaki)? is this too big? Are there consequences from this end naman?

wow! thanks ulit sa mga reply nyo.. I somehow understand na..

next question is, why not go bigger/faster (1.8 or 1.4 or meron pa bang mas malaki)? is this too big? Are there consequences from this end naman?

1.8 and 1.4 are usually in the realm of prime lenses.

the fastest zoom lenses usually stop at f/2.8 ... :D

hmmm.... so the zoom lenses dont go any bigger than 2.8? Any reason why?

yup yup once you go fast its hard to go back. but honsetly speaking earl naninibago ako sa f2.8 you know all my other lenses were sub f2:)

Yup, I know Bro. coming from something like an f/1.4 at 2.8 you'd be already tack sharp as a f/2.8 at f/5.6 well something similar to that analogy... :Grin:

the fastest zoom lenses usually stop at f/2.8 ... :D

True... True... For "structure and economic" reasons... Imagine a zoom lens at f/1.4, maybe the front element of that lens would be as big as a platter. :D

I guess because of design & cost 18-300 f1.2 that would be like having an opening of 15mm at the wide end & a 250mm Filter for the long end.

Imagine a 250mm Diameter lens mouth, the lenght & weight of that! :Scared:

hmmm.... so the zoom lenses dont go any bigger than 2.8? Any reason why?

I guess because of design & cost 18-300 f1.2 that would be like having an opening of 15mm at the wide end & a 250mm Filter for the long end.

Imagine a 250mm Diameter lens mouth, the lenght & weight of that! :Scared:
Ahahahaha! You might need 5 VA's to haul that 18-300 f/1.2 lens!

now I get it :) sorry, medyo hindi second nature sa akin tong mga to but you guys are really helpful.

No need to be sorry, all of us where born without knowledge to start with, its good with this kind of community that the flame is passed on :)

now I get it :) sorry, medyo hindi second nature sa akin tong mga to but you guys are really helpful.

The Digital Zuiko zoom lens goes down to F2.0.

ideal aperture of a lens for me when shooting in low light.

The Digital Zuiko zoom lens goes down to F2.0.

But it projects a smaller image circle than the full frame standard 35mm lenses... :)

guys... are all 2.8 lenses (for canon) 'L' series? tnx. :)

No..

For a product to be deemed L series, there's more than just maximum aperture. There's also build quality and high MTF ratings for resolving power and contrast.

But it projects a smaller image circle than the full frame standard 35mm lenses... :)

You're right! Thats why its so hard taking group pics at low light condition using f/2.8. That's the down side...

You're right! Thats why its so hard taking group pics at low light condition using f/2.8. That's the down side...

You also wouldn't want to shoot at f/2.8 for a group shot since the DOF is very shallow.:)