On a current job working amongst other optics with the Canon 8-64 T2.4.
On some shots against very bright backgrounds mainly windows and despite
flagging out, masking out the optic, we still have a little bit of glare
making some contours slightly soft on subjects in the foreground. The
optic is also clean, no smudge whatsoever.
The shots work but I am surprised we still have these tiny glare. Could
a change of optic be an answer? Could it be just that one Canon? Before
calling rental department and ask for another Canon 8-64 wanted to have
If you have a very bright, blown out window and place a subject in front
of it, the Canon 8-64 will always give a little bit of veiling around
that subject. I have found that you need a pretty bright window to make
that happen, but it is an artefact I've seen repeated on numerous 8-64s,
including my own. The same is true for other Canon zooms such as the 7-63,
11.5-138 & 11.5-165.
I consider it a very minor flaw in an otherwise excellent lens set. Also
be sure to have a decent mattebox or sunshade. Light hitting the front
element at an acute angle can cause a green flare that you might not pick
up until dailies.
>the Canon 8-64 T2.4. On some
shots against very bright >backgrounds…still have a little
bit of glare
I worked with the Canon 8-64 on an action TV series and we found that
we had to limit bright skies in the back ground or we would get a veiling
flair (not attractive). Not blown out skies at open stops as our day/ext
stops were 5.6 or deeper, set ups you wouldn't worry about in 35mm. It
was a surprise the first time we saw this in video dailies but there is
a hint of the flair in the viewfinder if you look carefully (even the
SR III finder). Any way we often set shots from higher angles or moved
set dressing/greens to limit patches of sky in the frame.
Mitch Gross wrote :
>Also be sure to have a decent
mattebox or sunshade. Light hitting the >front element at
an acute angle can cause a green flare that you might >not
pick up until dailies.
MB-16, Masks or Mattes, Eyebrow and sides even showing up in the safety,
even Black-Wrap closing between sides just above the rods when light bouncing
from reflector, French flag. Using all techniques I know of. The gaffer
and his boys are also doing a great job. Flags are always positioned to
cut off direct light hitting camera.
Shooting wide open no filter. Guess this looks like maybe a coating difference.
I'll have a close look at the optics on Monday morning. Have a chat with
the rental dept. to see if I can have a second one send and compare both.
That is exactly what was done the next day I saw the dailies. On one particular
set-up suggested the DoP to frame from a higher angle as I was almost
convinced that whatever we did to block off we were going to get veiling
glare. It was quickly done as a safety just in case it would look to soft.
Awaiting to see the dailies on that.
When working on these lenses, its not uncommon to find a light blue haze
on the surface of the internal lens elements. I don't know if it is the
white Canon grease "outgassing" or whatever. I've had to completely
clean the glass in several of these zooms. If you get a chance, put the
zoom on a lens projector and look down it, you will be able to spot the
Just to inform that all glare problems are gone and well gone. Changed
the lens and what a difference. Back to standard masking and flagging
procedure and no more alternative angles. Was a very frustrating moment.
The lens technician at the rental place could not see a difference on
his testing bench either. He was going to go for a test with shooting
some neg as well.