Backfocus? Or misfocus?

[dannirr]

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I have seen a lot here about backfocus. I am not really clear what that means - perhaps someone can explain that to me.

 

My Tri Elmar, when at infinity, does not bring the rangefinder into alignement (yet the images look ok to me). It does not go past, it simply never gets to alignement. Is this backfocus?

 

Danni

[cbretteville]

I have seen a lot here about backfocus. I am not really clear what that means - perhaps someone can explain that to me.

 

My Tri Elmar, when at infinity, does not bring the rangefinder into alignement (yet the images look ok to me). It does not go past, it simply never gets to alignement. Is this backfocus?

 

Danni

 

Backfocus is when focus in the image is behind where you focused when you shot it.

[Shootist]

Not really.

Backfocus is when you focus on a object and that object is not in focus and some other object behind the one you are focusing on is in focus.

It can be caused by a misaligned rangefinder or a out of spec lens.

With a auto focus SLR it is caused by a misaligned focusing sensor.

[jaapv]

I have seen a lot here about backfocus. I am not really clear what that means - perhaps someone can explain that to me.

 

My Tri Elmar, when at infinity, does not bring the rangefinder into alignement (yet the images look ok to me). It does not go past, it simply never gets to alignement. Is this backfocus?

 

Danni

 

If it is just this lens, leave it and live with it. But if most of you lenses do this, adjust infinity. I mean real infinity, like the moon or a distant mountain.