Algernon

Joined: 22nd May 2010

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Algernon
Possibly huge numbers going back to previous
versions. I went back to v3.6ish on one PC and I'm
on v2 on this one, because Fasterfox still runs on
it and shows things like how long a page is taking
to load etc. This page took 0.440secs

I hate change just for the sake of change.

Comment by Algernon posted on Firefox 8 out at 10/11/2011 - 08:29

Algernon
Most of the MF lenses I've tried on the K-5 require beyond -10
Bit of a pain

It would be useful to know if "apply all" gets overridden?

Comment by Algernon posted on AF microadjustment at 09/11/2011 - 18:02

Algernon
Another use for the green hexagon is with M42 lenses. If it works
OK you can leave the lens set at the working aperture i.e. f/5.6
or f/8 and still focus OK, because a lot of zooms are that aperture
anyway.

Try focusing a 28 to 50mm lens at f/5.6 visually and you will see
what I mean about DOF.... it looks in focus, but isn't when you
import the pic onto a PC.

Comment by Algernon posted on AF microadjustment at 09/11/2011 - 14:00

Algernon
Gwyn wrote:
trixie wrote:
Gwyn wrote:
Sounds like a variation on the old chainpod to me.
Not sure what that is???
Have a look at this to give you an idea. Also done with a length of string

The simple modern version is a retractable dog lead, either using the lead or replacing it with chain .
That looks like it would at least stop you falling over backwards whilst taking a photograph!

Comment by Algernon posted on SteadyEpod. at 09/11/2011 - 11:50

Algernon
With a 35mm f/2.8 lens I even tried using LV at 10X to find the two
points where a target a meter away went in and out of focus so that
I could take an average of the two which would have been near enough
the correct point of focus. I used a focus rack that had +/- 30mm
adjustment, but it stayed in focus all the way according to the
10X image on the screen.... so I need something with +/- 100mm
adjustment.

The green hexagon on the other hand was sensitive to about +/- 3mm

Comment by Algernon posted on AF microadjustment at 09/11/2011 - 10:36

Algernon
The DA is slightly sharper wide open. Not much in it stopped down.
It's also faster and quieter focusing. Works well with the 1.7AF

Comment by Algernon posted on F* 300 f4.5 or DA * 300 f4? at 09/11/2011 - 10:09

Algernon
I've always used MF with 6x6 cameras... although when it looks in
focus.. it's not really in focus from a critical POV that is

By definition anything within the DOF looks in focus and you
can't argue with that.... so if I have a subject at say 10m and
and the DOF is from say 6.5m to 20m.... anything between
6.5m to 20m is going to look in focus... I might
actually be focused at 6.6m not 10m and I lose the
DOF behind the subject, because the true DOF is
now from about 5m to 10m

This partly shows what a lot of theoretical nonsense DOF tables
are You simply can't focus accurately enough for
them to be any use.

The green hexagon is incredibly accurate, I've tested it. The
problem is transferring that accuracy to the focus ring on the
lens.

LV Contrast AF is also accurate, but no use with MF lenses.

I'm really struggling with 28mm - 35mm f/3.5 lenses because
they have a big DOF, that's why I tend to use INF + f/8 and
leave it there. If I try to focus the object I focus on is
usually OOF... possibly my screen needs shimming.

Comment by Algernon posted on AF microadjustment at 09/11/2011 - 09:56

Algernon
It looks a great portrait lens... the bokeh is spot on.
I wouldn't use it for wildlife though. It's really a job for
something longer.

Looks sharp enough on the cityscape, but I'm not a fan
of afternoon sunlight at this time of the year

Comment by Algernon posted on Getting to know my FA*28-70 f/2.8 at 09/11/2011 - 08:33

Algernon
Really cute birds and well photographed

The first shot should have enormous sales potential
Could be used for almost anything

Comment by Algernon posted on Frogmouth at 09/11/2011 - 08:27

Algernon
ChrisA wrote:
So.. going back to the lens that's back focusing more than the K-5 adjustment allows... what's best to do?
I've the same problem with some MF lenses. If you are talking about AF lenses you can use LV with Contrast AF.... it's very fast.

Comment by Algernon posted on AF microadjustment at 09/11/2011 - 08:16

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