check reflection of white light in the lens elements and coatings,
you can usually count reflections and see different coating colorations:
From Shutterbug Lens Flare Definitions and Solutions by Don Garbera, p.
38, March 1989 - The color of multicoating on your lenses indicates the
Hi Gui,
Although is is not difficult to build a 120 back (I built a 120 6X12
panoramic pinhole camera from scratch), why not get one of these 120
backs that are fairly common on eBay? Here is one right now:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=1394656270
You may also consider
This may be old hat to some on the NG, but I am going to pass it along.
I had been restoring a Gundlatch-Manhattan 4x5 view camera. The leather
was a total loss so I carefully removed it with a sparse wet-down of hot
water. Unfortunately, some of the water leaked into the camera interior
and
a lot of the time, high resolution values for lenses are quoting
aerial resolution, of the lens alone based on imaging a test chart
and looking at the film plane with a modest power microscope. This
is very different from on-film resolution using standard films etc.
so a 200-250 lpmm aerial
This seems to hold up. My Grandagon N MC produces a rainbow of green
,yellow, and blue. My Single coated Ronar is a consistent blue-green. May
3 inch aero lens has yellow, blue and green. My 6 inch lens has blue and
purple. The aero lenses son't have as many different colors or as vivid as
This is very interesting. You should post this thread to the Altternative
photo list ( [EMAIL PROTECTED] )
as well as the Carbon list(carbon( [EMAIL PROTECTED] )... They
would all have a intrest in this information.. John Cremati.
John Cremati
- Original Message -
In old painting restoration the art conservators remove old varnish I
believeby rubbing alcohol with cotton Q tips first and if that does
not work they will try denatured alcohol second which is a little stronger
and if that does not work they will use acetone as a last resort ..
John Cremati wrote:
In old painting restoration the art conservators remove old varnish I
believeby rubbing alcohol with cotton Q tips first and if that does
not work they will try denatured alcohol second which is a little stronger
and if that does not work they will use
The reason the brake fluid works is that these old finishes were
shellac, not varnish. The brake fluid softens the shellac which then
rehardens.
This is exactly what went through my mind when I read about the whitening
effect of the water-- shellac was famous for the ease with which it could be
