[rollei_list] Re: Bright Screens
- From: "Roger Wiser" <rwiser@xxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Wed, 4 Jan 2012 09:48:11 -0600
I have had two experiences with the Maxwell Screens. One with a Rolleicord IV
that Maxwell both installed the screen and cla'ed the camera. The cost was 3X
what I paid for the camera whic was $75. The other was a Rolleiflex F that I
installed the screen myself. Both screens were of the same brightness. The
Rolleicord produced much sharper pictures. In fact it produced the best results
that I ever had with Rolleis.
The Maxwell installation was probably the main reason. I had no other bright
screen for comparisons.
I HAVE A REQUEST. CAN ANYONE GIVE ME THE EMAIL OR WEBSITE OF THE OTHER ROLLEI
LIST, IF IT STILL EXISTS?
Roger
----- Original Message -----
From: Kirk Thompson
To: Rollei List
Sent: Tuesday, January 03, 2012 11:17 PM
Subject: [rollei_list] Re: Bright Screens
Maxwell screens come with DIY instructions, but a surprising number of people
put screens in upside down – two of my Rolleis came that way.
I've always had Krikor or Mark Hansen install the screens and colimate the
lenses at the same time. Mark says that the majority of TLRs he works on need
this (he does Rollei & Zeiss).
IMO lens calibration should be done by a tech who has a colimator & doesn't
just eyeball the focus on a piece of ground glass. But you could do the latter
yourself.
Krikor's Rollei colimator sets lenses so 60' = infinity; Mark, Infinity =
infinity. I've heard that some techs put a piece of film in the camera for
'average curl,' while some use a piece of mirror, for absolute flatness.
Apparently there are diffferent approaches to this.
Kirk
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Subject: [rollei_list] Re: Bright Screens
From: starboy0@xxxxxxxxxxxxx
Date: Tue, 3 Jan 2012 17:17:17 -0600
To: rollei_list@xxxxxxxxxxxxx
Kirk,
Were you able to install the Maxwell grid screen yourself? Thought I read
somewhere the focussing mechanism needs to be recalibrated which can be
problematic.
Thanks,
Bob
On Jan 3, 2012, at 5:03 PM, Kirk Thompson <thompsonkirk@xxxxxxxxxxx> wrote:
Not a further thought, but a previous one that didn't make it into your
summary:
Bill Maxwell makes two types of focusing screens: plain ones with grids,
and others with split-image focusing aids. User reports in this thread and
elsewhere have spoken more favorably of the former.
'Additional data': Maxwell himself recommends the plain grid screen. When
you're ordering by phone, he can go on at some length about this.
Maxwell seems to offer the split image screens just because people keep
asking for them. Just a guess: prior to autofocus, the majority of DSLRs had a
split-image focusing aid. In the absence of experience, people have perhaps
tended to ask for what looked familiar. That was my own mistake, until I tried
the plain-grid one.
Kirk
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To: rollei_list@xxxxxxxxxxxxx
From: cuffe@xxxxxxx
Subject: [rollei_list] Re: Bright Screens
Date: Tue, 3 Jan 2012 22:13:17 +0000
This is a wonderful summary in a complex area where opinions are divided.
As a group I would expect our powers of observation to be particularly good,
hence the diversity of opinion indicates to me that there may be something
deeper going on here than just a subjective diversity of opinion. I'm trying to
think of some optical reason why one type of screen could suit some users
better than others.
The factors I'm coming up with are in order of significance:
Ability to close focus
Maximum pupil diameter, as it affects the depth of field available for the
eye to accommodate.
After these two I find myself considering usage patterns which might affect
users perceptions of utility.
Here again I list these in my perceived order of importance:
Preferred viewing distance i.e with magnifying lens up to the eye or truly
at waist level.
The relative importance of center and peripheral image areas,
A users knowledge of and customary use of auxiliary features such as micro
prisms, or grid lines for aligning the image.
Has any one any further thoughts on this or data to add?
All the best
Laurence Cuffe
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