From: Lea Murphy <lea@xxxxxxxxxxxxxxxxx>
Subject: Re: good lens gone bad?
To: "List for Photo/Imaging Educators - Professionals - Students" <photoforum@xxxxxxxxxxxxxxxxxx
>
Date: Thursday, January 29, 2009, 10:27 AM
Les,
Thank you for your input on this. I appreciate it.
I have a couple of non-Canon lenses. This Tamron is one I
love so much that I bought two of them because I like having
an f/2.8 through the zoom. It's light and small and I
love that. Plus it's a good lens.
I will definitely look at the Canons you noted if I have to
replace this lens.
Again, thank you.
Lea
On Jan 29, 2009, at 2:45 AM, fotofx@xxxxxxxxxxxxx wrote:
Hi Lea,
You probably just wore it out, it does happen. The
Tamrons are built much better than the Sigmas, but try and
find a Canon 24-70 2.8L or the 24-105 f4L, both are
mainstays in my kit and the 24/105 is great for portraits.
If you want a fixed FL the 85mm 1.4 cannot be beat. The
images quality and bokah are the very best that Canon has to
offer and will blow away anything else you have put in front
of your camera. I suggest renting from my friends at
borrowlenses.com prior to your purchase.
Yes the Canon lenses are more expensive than
aftermarket glass. but I have NEVER had one fail on a shoot.
My 70-200 2.8 used to be a rental prior to my owning it, it
has been in 5g dives, vibrated against all manner of
machines and hit by an overthrown baseball at a Giants game,
still keeps on ticking.
Lots of folks may chime in about this or that Sigma or
Tamron. I would think that many doe not have cameras and w/
lenses that are over 250,000 frame shot under harsh
conditions. Canon L series lenses are just that much better.
I sold Canon and the other stuff too. But the real
difference is the build quality and the images it helps you
to create. There is a real reason the aftermarket stuff is
cheaper.
Cheers,
Les
-----Original Message-----
From: Lea Murphy <lea@xxxxxxxxxxxxxxxxx>
Sent: Jan 28, 2009 3:11 PM
To: List for Photo/Imaging Educators -
Professionals - Students
<photoforum@xxxxxxxxxxxxxxxxxx>
Subject: Re: good lens gone bad?
Wow. Very helpful information.
Thank you so much.
Lea
On Jan 28, 2009, at 2:08 PM, Mark Blackwell wrote:
Ok Lea You have definitely identified the
source of the problem.
If the lens won't work on another body and
another lens will work on
the body that had the problem, its definitely
the lens. But there
are a couple of things to check.
First look real close at all the contacts and
re clean them if
possible. Years ago I had one go funky and I
cleaned the contacts
on the body, but not the lens. The gunk was
on the lens contacts.
Check for damage to pins, but you likely have
already done both.
Before I sent it back to the factory, Id check
around for a local
repair man/person to take a look at it. IF
there is anything that
they can do with it, its likely going to save
you some down time.
Yes contacts could go bad. The grinding
though to me sounds like it
might be something internal that has gone bad
that is demanding more
voltage than the body expects. The camera
sensing the need for
excess voltage suspects that something is in
the way of the current
causing the clean contacts message. I
don't know how easy it would
be to get to replace a motor or gears and
hopefully it isn't that.
Yet the good local guy could likely tell you
with just a listen, if
there is one near you and give you good sound
advise on how to
proceed.
--- On Wed, 1/28/09, Lea Murphy
<lea@xxxxxxxxxxxxxxxxx> wrote:
From: Lea Murphy
<lea@xxxxxxxxxxxxxxxxx>
Subject: Re: good lens gone bad?
To: "List for Photo/Imaging Educators
- Professionals - Students"
<photoforum@xxxxxxxxxxxxxxxxxx
Date: Wednesday, January 28, 2009, 11:53
AM
It's a Tamron.
I have two of the exact same
lens...it's a 28-70mm
f/2.8.
I put the second one on and all is well.
The first one still won't work.
Lea
On Jan 28, 2009, at 11:46 AM, rebphoto
wrote:
What brand of lens?
I had a Sigma lens that worked fine
for over a year with my 10d and
then decided not to talk with the
camera
anymore. Kept giving the error 99.
I gave it to a friend.
He sent it to Sigma and for about
$10.00
they did something so it would talk to
his
Canon Rebel.
Russ
R.E. Baker
Photography
rebphoto@xxxxxxxxxxx
www.rebphoto.smugmug.com
Feed a Cat...
Starve a Fever........
----- Original Message -----
From: Lea Murphy
To: List for Photo/Imaging Educators -
Professionals -
Students
Sent: Wednesday, January 28, 2009
12:38 PM
Subject: good lens gone bad?
I have a dedicated 5D and lens in my
studio. It never
leaves there and isn't used by anyone
else.
Today when I used the camera for a
session it was
acting all funky, had a heck of a time
making focus and was
kind of grinding around as if I were
manually focusing with
the lens set in autofocus mode. I removed
the lens, put it
on my 5DM2, it behaved the same way and
the camera gave me
an error saying the contacts needed
cleaning. I cleaned them
but the problem persists. Can a lens or
lens contacts go
bad? It hasn't been dropped or used
outside the studio
ever. Actually, it's never off the
studio body. Any
ideas what in the world is going on here?
Lea
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