Here is a picture of the set with the Lego extension feet
http://www.siufai.dds.nl/Fap/_MG_9774.JPG
There are no filter threads on the projector lenses but using some linear
polarizer foil is a good tip. Thanks. I'll try to find some.
Siu Fai
Sent from my iPad
On 5 okt. 2016, at 19:28, John Wild <jwild@xxxxxxxxxxxxxxxxxxxxxx> wrote:
I used Cokin ones that I had to hand, the larger size. I bought a pair for
photographing a solar eclipse (I have turned my hearing aid off so I wont
hear when you shreik at me!). At right angles they block out most of the
light from the sun but not as much as a proper solar viewer.
They were just large enough to cover the front of the lens opening but I made
a pair of adapters out of large polythene waterpipe, machined to fit (I have
a lathe and mill in my workshop). Initial experiments were with sticky tape
but adjustment was hit and miss.
There are many brands available but I have some Hoya ones for camera lenses.
They do not have to be of best quality. Do projector lenses have a thread to
accept filters?
Lego, I never gave that a thought, having the equipment, I went the long way
around! I used Lego train track and a motor unit to make a running target
setup. The target acted like a sail and the wind blew the carriage off the
track, so only useable for dry firing inside! Design and circuit construction
was good fun though. I have not used it for a long time because I kept
hitting the lampshade as I swung round...
John
From: rollei_list-bounce@xxxxxxxxxxxxx <rollei_list-bounce@xxxxxxxxxxxxx> on
behalf of Siu Fai Au <siufai@xxxxxx>
Sent: 05 October 2016 17:55
To: rollei_list@xxxxxxxxxxxxx
Subject: [rollei_list] Re: about 6x6 slide projectors
John, where you getting the polarizers for the projectors?
I was thinking shooting a pair of Rollei 35 and project them in stereo with
the MSC300P. The MSC can do that for a limited amount of time to prevent
overheating. Alignment is easy on these machines.
Regarding that extension leg for the 6x6 projectors, I made one myself with
Lego.
Siu Fai
Sent from my iPad
On 5 okt. 2016, at 12:26, John Wild <jwild@xxxxxxxxxxxxxxxxxxxxxx> wrote:
I use http://www.peak-imaging.com/htmls/film_processing.htm for my ;
processing and they charge £4.80 for a 120 roll. There is a postage charge
on top so more than one roll gives better value.
I have a pair of Rolleivision 66AV projectors which I 'reluctantly' had to
buy complete with a Rollei fade controller at the end of the day at London
Photographica a few years ago from a 'tired, must sell at what ever price, I
do not want to have to carry this lot home' vendor. I then had the task of
carrying it home and soon saw why he wanted to off load it.
Not only can the setup do a fade show, it can do side by side panoramas and
3D projection. I have a Rolleidoscop 6x13 which I enjoy using but the
reported discontinuation of slide film may soon make that a dinosaur but in
the meantime, I take it out for a 'walkies' every so often.
Polarising filters and polarised glasses - they need to be linear ones - are
required. Coloured filters with coloured glasses can be used but that
destroys the colour rendition of quality transparency images. I made a
metalised screen using Screen Goo (Goo Systems Ultra Silver 3D Pair) from
http://www.goosystems.co.uk/products.php.
This is an American product but the UK/European supplier is 2 miles away
from me so a visit was worth while. A metalised screen retains the
polarisation of the images on reflection whereas a conventional screen
diffuses the light reflected from the screen.
It is imperative that the slides are positioned accurately in the mounts -
vertical position and horizontal angle of the image together with the
horizontal offset have to be carefully adjusted. Because they are seperately
mounted, I used a guide downloaded from Rocky Mountain Memories
http://www.rmm3d.com/
It is easier to mount pairs in a single mount for viewing with a stereo
viewer because both slides can be viewed side by side with the correct
linear displacement at the same time through the viewer and correctly
positioned before being taped in place and the mount sealed. The individual
6x6 projector slide mounts do not permit a viewer to be used because of the
greater linear displacement caused by the frame width of the two mounts,
hence a guide is required to position specific features of the image and
create the correct linear displacement for projecting. When projecting a
number of images, correct alignment of each pair is essential otherwise
members of the audience have to continually adjust their visual perspective
for each image.
Setting up and aligning the projectors for stereo projection is quite a time
consuming process. Aligning the two images from the projectors, one on top
of the other requires patience. The effect of keystoning can be reduced by
angling both projectors to the screen, one upwards and one downwards. Rollei
made an extension leg to support the upper projector which should be
adjusted to align the images in the horizontal plane and turning one or the
other adjusts the vertical plane. I made my own extension leg because the
only one I could find was on Ebay and the German vendor wanted too much for
it. Slight adjustment to yaw - if that is the correct term - can be made
with bits of paper or thin card. The lamp brigntness must be matched too.
This is more easily assessed once the polarised filters have been attached
to the lens and rotated to be 90 degrees to each other. Viewing through the
polarised glasses enables the filters to be rotated correctly when opening
and closing one eye at a time also the relative brightness and final minor
adjustments to projector angles can be made.
Mounting slides takes about 20 minutes for each pair, projector setup takes
about 3/4 hour, take down, 10 minutes!
Impressive slide show, well worth the effort for an enthusiastic audience
but not really worth it for a bored audience viewing the annual holiday
snaps.
Panoramas will be my next challenge, that is on my bucket list.
John
But for the most part, I wait until summer visits to Europe, and head to
a DM drugstore in Germany, for the 2.40 or 3.40 Euro processing charge
for a roll of 120, price dependent on whether sleeve or unsleeved.
Which other countries have similar prices to develop 120 slide film John
Probably none: Deustchland ist unser Foto-Paradies!
I have my 120 colour slides E6-processed by mail order in France, but
the cost is about 8 euro per roll which is still much less than USD 16,
even taking into account the current exchange rate (as of 2016-10-03):
USD 1.1 per 1 euro.
