[rollei_list] Re: Subject: Rollei graduated sky filter in Efke 25 film sheet
- From: Carlos Manuel Freaza <cmfreaza@xxxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 22 Apr 2009 14:13:40 -0700 (PDT)
Ed,
My main reading about filters was an original Focal Press book from the
'50s beginning called "Exposure", written by W. F. Berg, an engineer that
belonged to Kodak research labs, I have the Spanish translation. Berg dedicates
a chapter to explain filters basic working; you can apply the explanations to
new filters and similar situations about the book descriptions easily.
Claus Prochnow's books, Rollei Report I and Report II, have Rollei filters
production data and main features including the Rollei graduated sky filter, I
also have some old brochures about Rollei products and some old books about
Rollei like the 1950 edition "Rolleiflex and Rolleicord" by Walter Daniel
Emmanuel, another Focal press book translated into Spanish by Editorial Omega
Barcelona, Spain.
I don't think I know very much about filters Ed, hardly the basic to use them
as photographic tool, anyway thank you very much for the confidence about I
could discuss on filters with Norman Rothschild.-
Carlos
--- El mié 22-abr-09, aghalide@xxxxxxx <aghalide@xxxxxxx> escribió:
> De: aghalide@xxxxxxx <aghalide@xxxxxxx>
> Asunto: [rollei_list] Re: Subject: Rollei graduated sky filter in Efke 25
> film sheet
> Para: rollei_list@xxxxxxxxxxxxx
> Fecha: miércoles, 22 de abril de 2009, 2:52 pm
> Carlos,
>
> Your knowledge of filters for the Rollei is admirable. When
> I was at Popular Photography I edited Norman
> Rothschild's stories. He was also very knowledgeable
> about filters. Too bad he's no longer with us. It would
> be very interesting to have a story with a discussion about
> filters between you and Norman.
>
> Ed Meyers
> -------------- Original message from Carlos Manuel Freaza
> <cmfreaza@xxxxxxxxxxxx>: --------------
>
>
> >
> > Hi Jan: They could be similar filters but with clear
> variants: ND or Neutral Density filters are grey filters
> with different densities, the density is identical -uniform-
> for the filter as unit and according the photographer needs;
> the filter purpose is to block the light (every ray of the
> light spectrum) diminishing the light on the film plane
> doing necessary to increase exposure time, f.e. if you want
> to separate the subject regarding the background using
> differential DOF and the light is too bright to allow larger
> f stops, using this filter the light intensity on the film
> (or sensor) is lower allowing to open the diaphragm for
> larger stops; similar situation if you want to use a slower
> shutter speed. According the filter density, they are called
> grade 1, grade 2, grade 4, etc., exposure changes linked to
> the filter density. These filters are called "grau
> filter" in German ("grey filter") by Prochnow
> in the Report 2,
> > Rollei manufactured "Rollei-Filter
> > grau 2" and "Rollei-Filter grau 4" for
> the TLR; they are called "filtros de
> > densidad" in Spanish.
> > There also are ND filters with different density for
> the same unit, these are
> > called "graduated ND filters" and they are
> designed to vary the exposure for the
> > same subject different areas, however the filter is
> always neutral regarding the
> > color light since blocks the light color rays equally.
>
> >
> > The "graduated filters" -Verlauffilter in
> German- could be or couldn't be ND
> > filters. Some graduated filters (as unit) can have
> different colors for special
> > purposes and then they no longer are "Neutral
> Density" filters since they are
> > dedicated to block specific color rays and not others,
> but they still are
> > "graduated filters" because their surface is
> not uniform.
> > The Rollei filter shown in my photograph is a no ND
> graduated filter, it is a
> > graduated "sky filter" for Black and White
> shots. The filter purpose is to
> > obtain photographs where the sky is a significant part
> of the composition, the
> > difference regarding a regular yellow filter is that
> the sky filter has a yellow
> > part and a transparent part and then you can use the
> yellow part for the sky and
> > the transparent part for the rest of the subject, BTW
> the main use for this
> > filter is landscapes, the detail is that you can
> maintain the normal exposure
> > without to use filter factors and obtaining a dark sky
> and keeping the rest of
> > the composition the normal tonal values.
> > Graduated sky filters were popular in the 20th
> century's first half for LF and
> > MF specially, Rollei manufactured the
> "Verlauffilter" from March 1935 to 1953
> > with some variants. This filter requires to work
> keeping a certain distance from
> > the lens and then the filter holder is fitted to the
> lens hood. There were
> > graduated sky filters for lens hood BI, BII and BIII,
> the BII was manufactured
> > for the Rolleilfex 2.8A and then my graduated filter
> BII that I use for the 3.5F
> > was made for the 2.8A.
> > This filter is rare today due to it was manufactured
> up to 1953 only.
> >
> > 6x6 contact prints are fine for a little album IMO,
> like those sixth plate and
> > nineth plate -7x8cm and 6x5cm- daguerreotypes from the
> 19th century. Thank you
> > for the comment about the photograph.-
> >
> > Carlos
> >
> > --- El dom 19-abr-09, Jan Decher escribió:
> >
> > > Carlos,
> > >
> > > Nice gear shot. Isn't what you are talking
> about
> > > basically a graduate ND filter
> ("Verlauffilter" in
> > > German)? I guess nowadays they are usually
> neutral gray so
> > > they also work with color.
> > > None of my Rollei brochures or accessory booklet
> show the
> > > holder in your picture. Must have been a
> relatively rare
> > > item. Definitely useful for landscapes. Current
> > > photographers frequently recommend ND filters
> even with
> > > their Canon 5Ds etc. Although, I think nature
> photographer
> > > Tim Fitzharris in Popular Photography is rather
> overdoing it
> > > with his top-of-the-line ND and other filters.
> > > I wouldn't mind finding this filter holder
> for my
> > > Rollei Bay II. Does it take regular Cokin size A
> (3x3)
> > > filters?
> > >
> > > Howeverr to be converted to using sheet film I
> would have
> > > to use at least a 4x5 camera, where it gets
> interesting to
> > > just do contact prints. For enlargements I would
> have to
> > > retool my entire darkroom with a large Omega or
> similar.
> > > Had an Omega D3 autofocus briefly, but it was a
> monster. My
> > > B22 XL sensibly limits my photographic ventures
> to 6x6 and
> > > 4.5x6 rollfilm.
> > >
> > > Happy experimenting,
> > > Jan
> > >
> > >
> > > On Apr 19, 2009, at 1:07 AM, FreeLists Mailing
> List Manager
> > > wrote:
> > > > Date: Sat, 18 Apr 2009 10:45:54 -0700 (PDT)
> > > > From: Carlos Manuel Freaza
> > >
> > > > Subject: [rollei_list] Rollei graduated sky
> filter in
> > > Efke 25 film sheet
> > > > The Rollei sky filter is an accesory that
> Rollei users
> > > don't use very much and it was commented a
> few times on
> > > the list. It's an interesting filter, it has
> a half part
> > > yellow and the other half part is transparent and
> then you
> > > can slide it in the film holder to place the
> yellow part for
> > > the sky, you can do it fitting the lens hood with
> the filter
> > > in the viewing lens previously.
> > > > I took a macro photograph with the 'cord
> IV Xenar
> > > and Rolleinar 1 close-up lens about the 3.5F
> provided with
> > > the Rollei sky filter, a filter rarely seen in
> Rollei TLR
> > > cameras and equipment photographs, and this is my
> first film
> > > sheet used with the Rollei Plate adapter, an Efke
> 25 film
> > > sheet developed in Tetenal 1+4 in the Combi-plan
> tank (very
> > > comfortable tank to work, the problem is that it
> leaks out
> > > liquid during the inversion movement). I lost one
> sheet, I
> > > forgot to loose the flm holder to put the sheet
> in the
> > > camera film plane, a beginner error.
> > > > I just uploaded the scanned sheet to Flickr,
> please
> > > see the large and original sizes, the file is
> bigger than
> > > the regular size I use for Flickr(this is an
> equipment
> > > image):
> > > >
> http://www.flickr.com/photos/itarfoto/3452366045/
> > > > Carlos
> >
> >
> > Yahoo! Cocina
> > Recetas prácticas y comida saludable
> > http://ar.mujer.yahoo.com/cocina/
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Yahoo! Cocina
Recetas prácticas y comida saludable
http://ar.mujer.yahoo.com/cocina/
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