A Photography forum. PhotoBanter.com

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » PhotoBanter.com forum » Photo Equipment » 35mm Photo Equipment
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

Interesting Leica product announcements today ...



 
 
Thread Tools Display Modes
  #11  
Old May 14th 12, 09:34 AM posted to rec.photo.digital.slr-systems,rec.photo.digital,rec.photo.equipment.35mm
Trevor[_2_]
external usenet poster
 
Posts: 874
Default Interesting Leica product announcements today ...


"PeterN" wrote in message
...
As I posted elsewhere, experiments are part of understanding a process. I
used to mix my own developers, not to save money, which I didn't, but to
learn how the different times and chemicals affected the images.


Me too, along with thousands of other darkroom experiments.

see no reason to trivialize his experiments.


OK, not trivializing them, just surprised he didn't realise his findings
were well known for well over half a century. Of course it's nice to see
these things for yourself, but then there is no need to post as if it's a
new discovery. However I'm not having a shot at him if he didn't already
know, and I'm sure many others hadn't thought about it.
I'm sure Prokudin-Gorsky knew about it however.

Trevor.



  #12  
Old May 14th 12, 04:25 PM posted to rec.photo.digital.slr-systems,rec.photo.digital,rec.photo.equipment.35mm
David Dyer-Bennet
external usenet poster
 
Posts: 1,814
Default Interesting Leica product announcements today ...

"Trevor" writes:

"PeterN" wrote in message
...
1. Leica M Monochrom, with 18 MP black and white full frame sensor. No
need for a Bayer pattern, no AA filter, no interpolation. Low noise
up to ISO 10,000.

Hmmm.... I can see already plans for a Photoshop add-on tool to merge
together three images taken with R,G,B filters. Kinda like a modern
autochrome @ 10000.

It's easy enough to do without any special tool. I did it testing my
theories about what caused certain background effects in the famous
Prokudin-Gorsky photos (http://www.loc.gov/exhibits/empire/); my RGB
merges are athttp://dd-b.net/ddbcms/2001/05/composite-color/.



Interesting experiments.


Why? I'm puzzled that he didn't realise people were doing this over 50 years
ago with multiple exposures on color film using real filters, and the main
aim was to get those colored ripples on water, or rainbow colored clouds
etc.


Who didn't realize what? Look, right up there in my quote, it says my
doing it was inspired by seeing the Prokudin-Gorsky photos (from rather
more than 50 years ago).

To be more detailed, in discussion, we concluded that the interesting
effects in the water and clouds were caused by the different exposure
times for the color channels, but I wanted to really nail down that
theory by reproducing the effect. So I did.

That's the only reason to do it these days too, not try to eliminate
it as David suggests. Obviously Prokudin-Gorsky would have seen this effect
immediately and taken steps to avoid it when he didn't want it.

However if Prokudin-Gorsky used a 3 lens projector, why could he not use a 3
lens camera and take simultaneous images? Are we sure he didn't? The image
of the Nilova Monastery shows no colored ripples on the water or clouds at
all, so either it's been very heavily doctored, or he did take simultaneous
images.


We don't have his exact camera. However, ALL the cameras we do have (or
have writings about) from that period using a three-exposure system took
them sequentially, not simultaneously. It does seem like simultaneous
exposures were technically possible, but it doesn't seem that anybody
actually did them.

I haven't tried reconstructing the Nilova Monastery picture myself, but
the individual scans are on the loc.gov site. That would quickly tell
you if the colored ripples were removed in post-processing or were
absent from the picture, at least. The water does NOT look absolutely
flat. I could believe the clouds were moving slowly enough not to give
visible fringing, but I'm not so sure about the water.
--
David Dyer-Bennet, ; http://dd-b.net/
Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/
Photos: http://dd-b.net/photography/gallery/
Dragaera: http://dragaera.info
  #13  
Old May 14th 12, 04:26 PM posted to rec.photo.digital.slr-systems,rec.photo.digital,rec.photo.equipment.35mm
David Dyer-Bennet
external usenet poster
 
Posts: 1,814
Default Interesting Leica product announcements today ...

"Trevor" writes:

"Savageduck" wrote in message
news:[email protected]
Why? I'm puzzled that he didn't realise people were doing this over 50
years
ago with multiple exposures on color film using real filters, and the
main
aim was to get those colored ripples on water, or rainbow colored clouds
etc. That's the only reason to do it these days too, not try to
eliminate
it as David suggests. Obviously Prokudin-Gorsky would have seen this
effect
immediately and taken steps to avoid it when he didn't want it.
However if Prokudin-Gorsky used a 3 lens projector, why could he not use
a 3
lens camera and take simultaneous images? Are we sure he didn't? The
image
of the Nilova Monastery shows no colored ripples on the water or clouds
at
all, so either it's been very heavily doctored, or he did take
simultaneous
images.

It is thought Prokudin-Gorsky probably used a personally customized
versions of the earlier Adolf Miethe camera produced by Bermpohl Company.


That camera doesn't take simultaneous images, so the question remains why no
color artifacts are visible in the Prokudin-Gorsky photo's. If they have in
fact been doctored to the extreme, it should have beeen stated what was done
IMO.


In many of the photos the color artifacts ARE visible. Just a few
aren't; those could be good luck with weather, fast operation of a
sequential camera, or perhaps extensive post-processing. As I said, the
original scans are downloadable from the LOC site, it's easy to check if
the artifacts are present before post-processing.
--
David Dyer-Bennet, ; http://dd-b.net/
Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/
Photos: http://dd-b.net/photography/gallery/
Dragaera: http://dragaera.info
  #14  
Old May 15th 12, 03:09 AM posted to rec.photo.digital.slr-systems,rec.photo.digital,rec.photo.equipment.35mm
Trevor[_2_]
external usenet poster
 
Posts: 874
Default Interesting Leica product announcements today ...


"David Dyer-Bennet" wrote in message
...
We don't have his exact camera. However, ALL the cameras we do have (or
have writings about) from that period using a three-exposure system took
them sequentially, not simultaneously. It does seem like simultaneous
exposures were technically possible, but it doesn't seem that anybody
actually did them.


I can't see how you can avoid color fringing on water and clouds without
simultaneous exposure or serious post processing.


I haven't tried reconstructing the Nilova Monastery picture myself, but
the individual scans are on the loc.gov site. That would quickly tell
you if the colored ripples were removed in post-processing or were
absent from the picture, at least. The water does NOT look absolutely
flat. I could believe the clouds were moving slowly enough not to give
visible fringing, but I'm not so sure about the water.


It's very rare the clouds will stay still long enough either for the time
needed to change filters and take 3 exposures without some fringing either.

I'm just saying, all these things would have been well known to P-G through
experience. IF the Nilova photo and others are not heavily doctored, I'm
betting he used a 3 lens camera, or 3 cameras simultaneously. Of course he
would only have done that after using a single camera/lens and discovering
the problem in the first place.

Trevor.


 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Interesting Leica product announcements today ... Wolfgang Weisselberg 35mm Photo Equipment 18 May 16th 12 03:22 AM
Interesting Leica product announcements today ... PeterN Digital SLR Cameras 1 May 11th 12 04:43 AM


All times are GMT +1. The time now is 11:59 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
Copyright 2004-2022 PhotoBanter.com.
The comments are property of their posters.