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Since: Dec 07, 2004
Posts: 112
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(Msg. 1) Posted: Tue Mar 22, 2005 4:50 am
Post subject: The Widepan *can* do night photography
Archived from groups: rec>photo>equipment>medium-format (more info?)
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Since: Apr 15, 2004
Posts: 241
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(Msg. 2) Posted: Tue Mar 22, 2005 12:41 pm
Post subject: Re: The Widepan *can* do night photography [Login to view extended thread Info.]
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RolandRB <rolandberry DeleteThis @hotmail.com> wrote:
> Just hope the camera and nothing
> else has moved inbetween.
Ha, ha, ha...
Ralf
--
Ralf R. Radermacher - DL9KCG - Köln/Cologne, Germany
private homepage: <a style='text-decoration: underline;' href="http://www.fotoralf.de" target="_blank">http://www.fotoralf.de</a>
manual cameras and photo galleries - updated Jan. 10, 2005
Contarex - Kiev 60 - Horizon 202 - P6 mount lenses<!-- ~MESSAGE_AFTER~ --> |
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Since: Dec 07, 2004
Posts: 112
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(Msg. 3) Posted: Thu Apr 07, 2005 4:00 am
Post subject: Re: The Widepan *can* do night photography [Login to view extended thread Info.]
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Since: Dec 07, 2004
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(Msg. 4) Posted: Thu Apr 07, 2005 6:11 am
Post subject: Re: The Widepan *can* do night photography [Login to view extended thread Info.]
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Maths first. Maths first always with me. You know that or *should* know
it by now.
Firstly recalculate the focussing distance from the DoF charts and
ignore anything that may be stated in the manual or online manual. From
the DoF values the 3 distances are 13', 20' and 26'. Then determine
infinity focus setting. Easy in this case as infinity will be the same
distance from the 26' line as the 13' line is except the other side.
Have to determine whether it is front cell focussing so I can calculate
the nodal point movement and reduction in horizontal resolution.
Sorry, lots of work to do. It may take months before I put a film in
it. >> Stay informed about: The Widepan *can* do night photography |
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Since: Apr 07, 2005
Posts: 15
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(Msg. 5) Posted: Thu Apr 07, 2005 6:24 am
Post subject: Re: The Widepan *can* do night photography [Login to view extended thread Info.]
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Since: Mar 25, 2005
Posts: 45
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(Msg. 6) Posted: Thu Apr 07, 2005 9:58 am
Post subject: Re: The Widepan *can* do night photography [Login to view extended thread Info.]
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"RolandRB" <rolandberry DeleteThis @hotmail.com> wrote in message
news:1112879508.150705.117810@l41g2000cwc.googlegroups.com...
> Maths first. Maths first always with me. You know that or *should* know
> it by now.
>
> Firstly recalculate the focussing distance from the DoF charts and
> ignore anything that may be stated in the manual or online manual. From
> the DoF values the 3 distances are 13', 20' and 26'. Then determine
> infinity focus setting. Easy in this case as infinity will be the same
> distance from the 26' line as the 13' line is except the other side.
>
> Have to determine whether it is front cell focussing so I can calculate
> the nodal point movement and reduction in horizontal resolution.
>
> Sorry, lots of work to do. It may take months before I put a film in
> it.
That is just about the silliest thing I ever read. For gosh sakes, take some
friggin pictures and see what the outcome is, or are you the most unusual
photographer who sees only metrics, _regardless of outcomes_?
It's all bull unless you make pictures.<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: The Widepan *can* do night photography |
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Since: Feb 24, 2004
Posts: 287
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(Msg. 7) Posted: Thu Apr 07, 2005 11:55 am
Post subject: Re: The Widepan *can* do night photography [Login to view extended thread Info.]
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"RolandRB" <rolandberry DeleteThis @hotmail.com> wrote in message
news:1112879508.150705.117810@l41g2000cwc.googlegroups.com...
> Maths first. Maths first always with me. You know that or *should* know
> it by now.
>
Yeah, I'm like that, too. Get a new kick-ass camera, and I can't wait to do
some math!
Mmmmmmm... math.
--
Regards,
Matt Clara
<a style='text-decoration: underline;' href="http://www.mattclara.com" target="_blank">www.mattclara.com</a><!-- ~MESSAGE_AFTER~ --> >> Stay informed about: The Widepan *can* do night photography |
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Since: Dec 07, 2004
Posts: 112
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(Msg. 8) Posted: Fri Apr 08, 2005 3:50 am
Post subject: Re: The Widepan *can* do night photography [Login to view extended thread Info.]
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I took a Widelux as my main camera for a two week trip around Europe
once. I took the friggin pictures assuming the camera was fit for the
job and all the pictures were out of focus since it is fixed-focussed
to about 8 feet. A huge wasted opportunity. Never again. >> Stay informed about: The Widepan *can* do night photography |
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Since: Dec 10, 2004
Posts: 51
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(Msg. 9) Posted: Fri Apr 08, 2005 4:55 am
Post subject: Re: The Widepan *can* do night photography [Login to view extended thread Info.]
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Matt Clara wrote:
>
> "RolandRB" <rolandberry.TakeThisOut@hotmail.com> wrote in message
> news:1112879508.150705.117810@l41g2000cwc.googlegroups.com...
>> Maths first. Maths first always with me. You know that or *should* know
>> it by now.
>>
>
> Yeah, I'm like that, too. Get a new kick-ass camera, and I can't wait to
> do some math!
> Mmmmmmm... math.
>
What does he do when he gets a new calculator?
--
<a style='text-decoration: underline;' href="http://www.petezilla.co.uk" target="_blank">http://www.petezilla.co.uk</a><!-- ~MESSAGE_AFTER~ --> >> Stay informed about: The Widepan *can* do night photography |
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Since: Mar 25, 2005
Posts: 45
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(Msg. 10) Posted: Fri Apr 08, 2005 10:18 am
Post subject: Re: The Widepan *can* do night photography [Login to view extended thread Info.]
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"RolandRB" <rolandberry.DeleteThis@hotmail.com> wrote in message
news:1112957423.197877.202540@g14g2000cwa.googlegroups.com...
>I took a Widelux as my main camera for a two week trip around Europe
> once. I took the friggin pictures assuming the camera was fit for the
> job and all the pictures were out of focus since it is fixed-focussed
> to about 8 feet. A huge wasted opportunity. Never again.
It seems reasonable to test the camera with a roll or two first, but I can't
see why one must spend "months" doing mathematical estimates as to how it
may perform. Take some pictures to be sure there are no hidden issues.<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: The Widepan *can* do night photography |
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Since: Mar 25, 2005
Posts: 45
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(Msg. 11) Posted: Fri Apr 08, 2005 1:50 pm
Post subject: Re: The Widepan *can* do night photography [Login to view extended thread Info.]
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"Peter Chant" <pete RemoveThis @petezilla.co.uk> wrote in message
news:3bmsbuF6gr8mdU1@individual.net...
> Matt Clara wrote:
>
>>
>> "RolandRB" <rolandberry RemoveThis @hotmail.com> wrote in message
>> news:1112879508.150705.117810@l41g2000cwc.googlegroups.com...
>>> Maths first. Maths first always with me. You know that or *should* know
>>> it by now.
>>>
>>
>> Yeah, I'm like that, too. Get a new kick-ass camera, and I can't wait to
>> do some math!
>> Mmmmmmm... math.
>>
>
> What does he do when he gets a new calculator?
He tries to take pictures with it.
Frankly, I don't believe RolandRB has the camera in question.<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: The Widepan *can* do night photography |
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Since: Mar 06, 2004
Posts: 335
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(Msg. 12) Posted: Fri Apr 08, 2005 1:55 pm
Post subject: Re: The Widepan *can* do night photography [Login to view extended thread Info.]
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Recently, jjs <jjs.RemoveThis@jjs.jjs> posted:
> "RolandRB" <rolandberry.RemoveThis@hotmail.com> wrote in message
> news:1112957423.197877.202540@g14g2000cwa.googlegroups.com...
>> I took a Widelux as my main camera for a two week trip around Europe
>> once. I took the friggin pictures assuming the camera was fit for the
>> job and all the pictures were out of focus since it is fixed-focussed
>> to about 8 feet. A huge wasted opportunity. Never again.
>
> It seems reasonable to test the camera with a roll or two first, but
> I can't see why one must spend "months" doing mathematical estimates
> as to how it may perform. Take some pictures to be sure there are no
> hidden issues.
>
Or... "a picture is worth a thousand equations". 
Neil<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: The Widepan *can* do night photography |
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Since: Dec 07, 2004
Posts: 112
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(Msg. 13) Posted: Mon Apr 11, 2005 12:02 am
Post subject: Re: The Widepan *can* do night photography [Login to view extended thread Info.]
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"months" was an exaggeration. It was just a case of finding the time.
I've done the maths now. I wanted to calculate what would happen to the
horizontal resolution at the three marked distances and also if set to
infinity if the whole lens was being shifted laterally moving the
secondary principal point off the axis. Then I take the photos and
compare actual results with calculated results.
The lens does indeed move laterally and is not front-cell focussing. If
the whole lens is moved without internal adjustment and the secondary
principal point is moving off the axis then this will be the result for
maximum horizontal resolution, assuming the secondary principal point
for the marked mid-point is exactly on the axis.
near (13') = 7 lp/mm
mid (20') = max lp/mm
far (26') = 16 lp/mm
inf = 3.7 lp/mm >> Stay informed about: The Widepan *can* do night photography |
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Since: Dec 07, 2004
Posts: 112
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(Msg. 14) Posted: Mon Apr 11, 2005 4:09 am
Post subject: Re: The Widepan *can* do night photography [Login to view extended thread Info.]
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