focus on infinity???

[debbie]

well, I just wonder, if I would foucus on something very far away, the moon for example, should not the focus ring be set to infinity?? Or is it something strange with the lens if it´s not??

[Jewelltrail]

Debbie:

You are correct, the Moon is at infinity.

Regards,

Ernest

[pasipasi]

Some lenses can focus beyond infinity. Then the focus ring is like a millimeter from infinity.

[Talisker]

If it's a zoom lens then the focal point may vary slightly at different focal lengths, so the lens has to refocus as you zoom (its cheaper that way) - thus the position of the focusing ring changes. Not all lenses have the barrels marked to reflect this.

[Canada_Rockies]

Many long lenses focus past infinity. This allows the changing length of the lens due to temperature changes to still allow the lens to reach infinity. As the temperature of a metal lens barrel drops, the length of the barrel gets shorter, and one must focus out a bit further to attain infinity focus.