M8 IR users - where is inf. IR focus for you?

[ampguy]

with R72 filter for say these lenses:

pre-asph Summilux 35

and

M-Hexanon 28/2.8 (has an IR mark, but I think inf. focus is actually closer than red line)

Any good techniques for IR focus bracketing? How far is far enough for infinity - 100 yards?

I have a couple of new IR images on my blog with the above lenses.

 

[jaapv]

Normally at the 5.6 DOF mark. But I usually focus-bracket. I see what you mean on your blog. That landscape could indeed be sharper.

 

[ampguy]

Thanks

Thanks

Yes, I've since gotten much sharper images around 5.6-8 on the focus scale.

If I recall, the landscape image was just a tad closer than the red IR mark on the M-Hex 2.4 lens, and needed many more degrees of closer focusing.

Probably should drag the tripod out.

Normally at the 5.6 DOF mark. But I usually focus-bracket. I see what you mean on your blog. That landscape could indeed be sharper.