Apature

[SpecialK]

Never argue with a fool. This is even better than the "4/3's is its own form- factor" thread.

[fionndruinne]

Is it bad that I find this hilarious?

Razr, assuming you do own the DSLRs you name, how about moseying over to wherever you keep them and popping a variable aperture lens on one, setting it to your precious aperture-priority or manual mode, and checking it for yourself? No doubt you'll feel violated when your f/2.8 aperture setting somehow breaks the "law of Av photography" (just where did that law originate?) by changing on its own to f/4.5. Then again, better not, since you may be freaked out by your apparently possessed camera, and sustain a heart attack.

i'm finding it hard to believe we're even talking about this. it may very well be the most ridiculous discussion in the history of this forum.

Amen to that, brother. Which is why it is so appealing.

[Razr]

This is madness.... I won't be reading this thread anymore and this is my last input.
Take the f2.8-4.5 lens as an example, and in Av or S

Which tells me me you are unaware that "S" (shutter priority) freezes the shutter and allows/forces the aperture to balance the exposure.
And "A" (Av) freezes the aperture, forcing the shutter to balance the exposure.

mode you put it to max F2.8. Then on full zoom of course the aperture can close down to 4.5.

Only if in "P" or "S" modes. Otherwise, in Av and full manual mode, the aperture (by defintion in those modes) is locked in place.

One thing can interfere with the law of photography: The law of PHYSICS, ie. Lens design.

The "lens design" is merely a tube with glass optics that allow light to pass through, whereupon the light is modifed by shutter/aperture/timer settings.

[Rooz]

Certainly not a true statement with a manual lens, and most difintiely not true when a lens is set on an aperture in Av mode. True only if the lens is set on shutter priority or "P". Not true if set on Av or M.

it doesn't matter if it is a manual lens or not. just like it doesn;t matter if its in Av or M mode.

Where did I say or infer such? Quote please. .

you just said it in the exact same post. you've been saying it from the beginning and its WRONG.

[Razr]

Is it bad that I find this hilarious?

Amen to that, brother. Which is why it is so appealing.

Razr is not the thread topic.

[fionndruinne]

Ahh, but Razr is the only one I know of who can purvey just such a topic as this.

And you'll notice that everything in my post but what you quoted was on topic.

[Razr]

of course it cannot be set wider than its max aperture. are you drunk ?

Please post the exact statement and post# where I said so.

Of course you won't find it.

[Rooz]

Which tells me me you are unaware that "S" (shutter priority) freezes the shutter and allows/forces the aperture to balance the exposure.
And "A" (Av) freezes the aperture, forcing the shutter to balance the exposure. Only if in "P" or "S" modes. Otherwise, in Av and full manual mode, the aperture (by defintion in those modes) is locked in place. The "lens design" is merely a tube with glass optics that allow light to pass through, whereupon the light is modifed by shutter/aperture/timer settings.

the lens has no bearing on the shutter speed so it's not relevant in the slightest to this discussion.

if the lens is just a tube with some glass in it what regulates the amount of light passing from the front of the lens to the rear element and ultimately the camera ? ie: where exactly are the aperture blades located ? or is that just an electronic figment of our imagination ?

you simply cannot admit your wrong which makes you so much more foolish.

[Rooz]

Please post the exact statement and post# where I said so.

Of course you won't find it.

every post you've made makes that statement.

[achuang]

every post you've made makes that statement.

That's right. Saying that a 17-70 f2.8-4.5 lens can be shot at f2.8 at 70mm is saying that the lens can be shot wider than it's maximum aperture.