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Canon
8 - 64 & Veiling Glare/Flare
Published : 30th September 2003
Greetings everyone,
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
your opinion.
Appreciate your help, thanks beforehand.
Regards
Emmanuel SUYS
Kamera-Assistent, Focus Puller, Assistant Camera
Français, Nederlands, English, Deutsch
Hi Manny,
I've always found the 8-64 to be a very clean lens, it's one of the reasons
that I prefer it to later versions.
I'd check out an alternative if you can.
Cheers
Geoff Boyle FBKS
Director of Photography
EU based
www.cinematography.net/geoff
>I've always found the 8-64 to
be a very clean lens, it's one of the reasons >that I prefer
it to later versions.
I'm using one now too, but if its real bright it could veil on you. It’s
not near the antiflare quality of the newer HD 21x & 11x, but its
still a solid lens that doesn't focus-breathe.
You might be able to find a better one, but it would be mostly in the
coatings, right ?
Mark Doering-Powell
LA based DP
Mark Doering-Powell wrote :
>You might be able to find a
better one, but it would be mostly in the >coatings, right?
Greetings,
Well, I would guess the difference is mainly due to coatings. Maybe the
coating is not as it used to be due to age and improper cleaning technique.
Used the Canon 8-64 quite a lot before and as a matter of fact in the
same location but in different lighting set-up. Never had such a nasty
little bugger.
In the event I cannot get an alternative, as rental facility is almost
totally empty (everyone is rolling right now), would the Canon 7-63 be as effective
glare wise?
Presumably I would have to test but time is lacking on my side as very
heavy schedule.
Regards
Emmanuel SUYS
Kamera-Assistent, Focus Puller, Assistant Camera
Français, Nederlands, English, Deutsch
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.
Mitch Gross
NYC DP
>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.
David Campbell
Steadicam/op
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.
Greetings Mitch,
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.
Or maybe I am just to picky.
Regards
Emmanuel SUYS
Kamera-Assistent, Focus Puller, Assistant Camera
Français, Nederland’s, English, Deutsch
David Campbell wrote :
>Any way we often set shots from
higher angles
Greetings David,
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.
Regards
Emmanuel SUYS
Kamera-Assistent, Focus Puller, Assistant Camera
35mm - 16mm
Français, Nederland’s, English, Deutsch
Emmanuel,
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
haze easily.
Regards
Andy Taylor
Camera ( and lens! )Engineer
Arri Media
3 Highbridge
Oxford Road
Uxbridge
Middlesex UB8 1LX
UK
www.arrimedia.com
www.arri.com
Greetings everyone,
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.
Thanks for all help
Regards
Emmanuel SUYS
Kamera-Assistent, Focus Puller, Assistant Camera
35mm - 16mm
Français, Nederland’s, English, Deutsch
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