There is a just released useful video presentation of both stacking and
bracketing, with explanation of both modes, and clarification of the different
presentation in the menus of OM-1 and OM-D
https://friedmanarchives.blogspot.com/2022/06/focus-stacking-on-sony-olympus-and.html
He goes on to cover S and F cameras too, as if anyone would want to use them,
as well as merging stacks in PS with links to cover Helicon Focus.
Although it's on Gary Friedman's site, the video is Tony Phillips' work.
Piers
-----Original Message-----
From: olympus <olympus-bounces+piers.hemy=gmail.com@xxxxxxxxxxxxxxxxx> On
Behalf Of Moose
Sent: 27 June 2022 21:48
To: olympus@xxxxxxxxxxxxxxxxx
Subject: Re: [OM] WTFocus Stacking`
On 6/27/2022 11:07 AM, DZDub wrote:
> On Mon, Jun 27, 2022 at 12:09 AM Moose <olymoose@xxxxxxxxx> wrote:
>
>> On my E-M II:
>>
>> Focus stacking = Off (i.e. Focus Bracketing = On, as set on the
>> prior screen.)
>> Set number of shots = 31
>> Set focus differential = 1
>> Charge Time = 0
>> --------
>> Focus stacking = On (as an option within Focus Bracketing)
>> Set number of shots = 11
>> Set focus differential = 1
>> Charge Time = 0
>>
> This makes sense to me now. Thanks for sticking with me.
Excellent! My pleasure, literally.
> I've even gotten
> it to work, and it's extremely fast compared to focus stacking, which makes
> me think the 15 seconds or so that it takes to do an in-camera focus stack
> is mainly spent on processing rather than exposing.
Yup. If you watch the EVF/LCD during the process, you can see when shooting
stops and processing begins. On my E-M1 II,
shots are quick, writing out ORFs and JPEGs and then processing is almost all
of the time.
>> You mention backgrounds more than once. That's not what I'm looking for
>> with stack/bracketing. I'm looking for deeper
>> DoF than one shot can provide. Yes, the background matters, but that's a
>> separate issue to me, dealt with differently.
> Two sides to a coin to me, although I suppose I think about backgrounds
> more because I'm generally unwilling to spend a lot of time on backgrounds
> in post. I generally bracket (the old fashioned way) from f5.6 to f11 to
> see where I get the best compromise of DoF and good background.
Chuck and the other DoF mavens claim(ed) that f5.6 is optimal for a 4/3"
sensor. My experience and testing disagree, but
f11 does get into visible loss of detail/sharpness.
I suspect that part of the disagreement 'tween the tables and practice may be
that demosaicing the Bayer array data
loses detail. Ctein estimates that loss at 50%. I've certainly seen it. Shoot
on a tripod, regular and HR. Downsample
the HR file to the size of the straight shot. The result has much better,
clearer fine detail.
In my Bracketing practice, part of the process of leafing through the stack to
determine which frames to merge is
looking at the background.
> I guess I'm saying they are never really separated for me.
>
> One of the jobs of the stacking soft/firmware is to align the frames.
> The second is to adjust for focus breathing making
> frames slightly different sizes. All before actually merging focus.
>
> Focus breathing may be one of the criteria for choosing which lenses are
> compatible with in-camera FS
Notice that the Stacked JPEG is larger than the individual shots. There's a
frame when shooting FS to show the tighter
AoV. Dealing with focus breathing?
> I assumed it was something more proprietorial than focus breathing per se.
I did say "may be" and "one of the criteria". 😁
> Not all mZ lenses seem to work, which suggests design is a key.
It's all clear as mud to me. None of the non-macro primes are included, only
zooms, the macros and 8mm fishy.
> Do you happen to know if any Panny m43 lenses will focus bracket on an Oly
> camera?
Random grab - Panny 25/1.7 works fine. I suspect they all do. Bracketing is
much less fussy than Stacking.
Testing, Testing Moose
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