beyond infinity (Page 3): Yes, you are. My wife agrees: You and I are both wrong-- except about this... ;-)...

LoneRangeFinder Loc: Left field

sbesaw wrote:

Or, "if a tree falls in the woods and my wife doesn't hear it am I still wrong?"

Yes, you are. My wife agrees: You and I are both wrong-- except about this...

;-)

sbesaw Loc: Boston

LoneRangeFinder wrote:

Yes, you are. My wife agrees: You and I are both wrong-- except about this...

;-)

:-) :D :-D

lighthouse Loc: No Fixed Abode

Good answer jeep_daddy, this is why I always thought it was, and to allow for tolerances of +/- focus accuracy.
Cheaper and in this instance probably better to build to an accuracy of 2% than 0.1%.

jeep_daddy wrote:

Because on hot or cold days the lens barrel can expand and contract causing slight differences in focus. If it stopped exactly on infinity, on a hot day the barrel of the lens might expand 1mm longer then on a cool day causing your focus to be soft.

Mousie M Loc: Coventry, UK

bunuweld wrote:

We are getting into the mysterious land of astroph... (show quote)

I understood that the universe is a giant torus = donut shape, and all straight lines go round the torus and join up again. So if you have a powerful enough lens and enough time to wait you would look through it into space and see your own back. Now that would be a lens worth saving up for...... (Do you think there is a cheaper Sigma version??)

lighthouse Loc: No Fixed Abode

Ah yes, but what if the universe is really a mobius strip.

Mousie M wrote:

I understood that the universe is a giant torus = donut shape, and all straight lines go round the torus and join up again. So if you have a powerful enough lens and enough time to wait you would look through it into space and see your own back. Now that would be a lens worth saving up for...... (Do you think there is a cheaper Sigma version??)

n3eg Loc: West coast USA

lighthouse wrote:

Ah yes, but what if the universe is really a mobius strip.

I went to a Mobius strip joint once...

My lens focuses beyond infinity. Maybe I should check my star shots for black holes.

Mousie M Loc: Coventry, UK

lighthouse wrote:

Ah yes, but what if the universe is really a mobius strip.

I want the lens anyway.

I think your comments on accuracy in manufacture are right, together with the expansion thing. I have used a number of pairs of binoculars, and the cheaper ones always seem to have more "play" at the infinity end of the focus, and certainly a lot more than camera lenses.

wlgoode Loc: Globe, AZ

SharpShooter wrote:

Leo, sometimes an object is really so far away that it's actually a little further away than infinity. That enables you to focus on it more precisely.
Hey, just kidding!!
The lens needs to be able to hunt. It will move back and forth untill it can lock focus without hitting the stops. It's said that expansion also plays a role, but thats not something I have actually research myself. SS

Yep, Beyond the edge of the multiverse.

bunuweld Loc: Arizona

n3eg wrote:

I went to a Mobius strip joint once...

My lens focuses beyond infinity. Maybe I should check my star shots for black holes.

That's why black matter matters.

RAK Loc: Concord Ca

Me thinks that is called Bi Lateral Knee Replacement. If the pain in my joints are correct. I am 62 and they did not want to both at once but i said I would not go thru two recoveries. So I have converging lateral lines I can shoot from any time I want. If your wife had both done at once my hats off to her and you better mind your P&Q's cause she is one tough lady to do that and when she recovers you wont be able to out run her around the dinning room table. And as Buzz Light Year said from here to infinity, and beyond. Just keep working on it down load frequently examine and make adjustments until ya git it rite.

wlgoode Loc: Globe, AZ

Havya noticed that many positions on UHH are Moibus strip positions? They only have one side!

Pablo8 Loc: Nottingham UK.

henk33 wrote:

Beyond infinity is required when you want to shoot infrared. As infrared has a larger wave length, the focus length is shortened a little. To compensate that you must use a slight larger distance on the camara than the real distance.
Shooting at infinity requires than a setting a fraction beyond infinity.

My understanding was, that one focuses nearer than visual focus point when shooting IR. I've been doing it that way for years, on both film, and now digital, and getting good results. Maybe I should change??.....maybe NOT!

Bruce with a Canon Loc: Islip

Dave Lind wrote:

Ooohhh thats pretty heavy - bit like "if I wasn't me who would I be"

Which raises a more fun question, If you weren't you, who would pay for your gear?

AND what gear would you shoot?

Mousie M Loc: Coventry, UK

RAK wrote:

Me thinks that is called Bi Lateral Knee Replaceme... (show quote)

Whatever you are on, please can I have some?? 8-) :shock: :)

UtahBob Loc: Southern NJ

Pablo8 wrote:

My understanding was, that one focuses nearer than visual focus point when shooting IR. I've been doing it that way for years, on both film, and now digital, and getting good results. Maybe I should change??.....maybe NOT!

Based on looking at the ir marks on lenses, I think that is the appropriate method.