Back Focus Issue with the EX1????

not having the camera, i ask the following out of ignorance:

if internal nd1 & nd2 somehow "cause" the backfocus issue, would the use of external nd filters also "cause" the loss of backfaocus?

has anyone access to a set of screw-on or drop-in nd filters that they could test?

as always, thanks to all for discussing the camera's issues.

i'm sure/hopeful that work around solutions will soon be developed.

be well

rob
 
rob,

Filters won't affect backfocus when put on the front of the lens. Technically, they will affect forward focus, but so little that it's negligible.

The effect on focus on either end is maybe half a millimeter. In front of the lens, that is essentially zero. In back of the lens, that's a huge amount, especially at wide angles.
 
matthew77-

thanks for the info.

since filters won't affect backfocus, a screw-on/drop-in nd filter would cut the light allowing a low f-stop (and the resulting narrow dof) while not losing focus.

would the above be a decent work-around for the current nd1/nd2/backfocus issue?

thanks in advance

be well

rob

matthew77 said:
rob,

Filters won't affect backfocus when put on the front of the lens. Technically, they will affect forward focus, but so little that it's negligible.

The effect on focus on either end is maybe half a millimeter. In front of the lens, that is essentially zero. In back of the lens, that's a huge amount, especially at wide angles.
Click to expand...
 
Absolutely, it's really the only workaround if your internal filters are screwy. But at a great cost to the convenience and speed that the internal filters provide.

My filters work fine - so I think this (clearly annoying) backfocus thing is only on some cameras.

But I wonder if it's a failure that will happen over time to the cameras that are currently working.
 
rob,

perhaps you misunderstood - my internal filters work fine so I don't need to use external ones (for ND).

I haven't purchased a matte box for my EX1. For what I do I shoot everything clean and adjust in post.

There are others (phil bloom?) who have a lot of experience with matte boxes and can tell you more.

For the occasional use of a polarizer, I use a screw on. Mostly this means losing the factory matte box as many filters are too thick to allow it to be put on top of them.
 
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