PeterB666
Top Veteran
So if you set the focus to infinity and then turn to a very distant object, kilometres way or many thousands of kilometres, e.g. the moon, is it in focus or not?
If not, then and only then can you claim infinty is not infinity.
Likewise, if you place an object at a measured 3 metres and set the focus ring to 3 metres, is it in focus or not?
When working with extremes of depth of field (for example relying on an assumed hyperfocal setting), you need to take into consideration what you intend to do with the images. As the Cambridge calculator shows, there is more to take into consideration than just the focal length and aperture of the lens.
With most lenses these days not having depth of field markings (or so few that they are useless) there is no substitute for experience and applying that same experience in practice.
If not, then and only then can you claim infinty is not infinity.
Likewise, if you place an object at a measured 3 metres and set the focus ring to 3 metres, is it in focus or not?
When working with extremes of depth of field (for example relying on an assumed hyperfocal setting), you need to take into consideration what you intend to do with the images. As the Cambridge calculator shows, there is more to take into consideration than just the focal length and aperture of the lens.
With most lenses these days not having depth of field markings (or so few that they are useless) there is no substitute for experience and applying that same experience in practice.