Congrats on the modification. As I mentioned before, it's like
I've got a whole new camera with this addition.... doesn't help that it
was inexpensive, too!
On 2/1/06, Thibouille <[EMAIL PROTECTED]> wrote:
Now, how did you do to have it cut exactly as it should?
There's no "should" :)
I measured the original and the one to be cut down with a dial
calipers. Splitting the difference and give myself 0.005" "fudge-factor"
on each side, I ran the edge of the calipers' fingers down each edge to
scratch a line. Then I just sanded to the line.
>> How to be sure that the prism will be in the middle?
I just cut a bit from each side at a time. The circle is not perfectly
aligned with the central af confirm point, but that's not really
important. Now that you mention it, and as Tomasz just said, it would
be interesting to have the circle 2/3rds to one side. It would also be
interesting to have two or more circles, actually...
Even after all of that, mine's not quite in the center. The AF
red dot shows up about 1/3 of the inner circle (split prism) off-center to
the right. I am able to position my eye around in the viewfinder enough
to get even blacking-out at high f-stops even in this case. It would
probably have to be off a fair bit to not be able to do that.
> I just thought: given the original size of these screens, if you want
a vertical split prism you could cut it that way--I think the shorter
side of the MX screen is a bit longer than the longest side of the
istD one. You could even get a not-quite horizontal split, I bet you
could get ~30 degrees or so. Cutting would be more difficult though.
I've thought of that. It *would* be more difficult to cut, but it
might even have the advange of going 3:2, rather than 1:1 as in 45
degrees... i.e. pointing corner-to-corner in the frame. I don't know if
that would look right or not. I think making a jig to cut it would also
be required.
I should have taken more pictures of the process but I was
skeptical as to whether or not it would work. I'll try to take some when
my friend (with a Canon 350) does it... real soon now that he's seen mine.
He's got an old screwmount Takumar 55mm f/1.8 and a VS1 70-210 f/3.5 that
he rarely uses because he cannot see to focus them.
-Cory
--
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* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
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