Richard,
Occasionally we will get a much more defined shadow of the masking plate (the
thingy with the notch that identifies images are from Zeiss rather than Topcon
or other camera). I can usually get rid of it by switching to a different port
& then back or rebooting either the camera or imaging software (Escalon).
Just a guess but I think it might have something to do with the mirror or
pop-in filters not getting enough of a signal to get out of the way in time.
Maybe lubricating any hinges or replacing any springs (if there are any) might
help??? You can also check that the turret that holds different filters or lens
magnifications is seating properly too or that the filters & lenses themselves
aren't loosening in their mounts.
Good luck,
Paul Paquette
-----Original Message-----
From: Richard Morrone <rmorrone@xxxxxxxxxxx>
To: optimal <optimal@xxxxxxxxxxxxx>
Sent: Fri, Feb 10, 2017 8:38 am
Subject: [optimal] Re: Camera Artifact Zeiss FF450+
Hi,
I've been using this particular FF450+ for over 8 years,and this is definitely
a camera glitch. I use two other FF450+ cameras in townand have never seen
this artifact on either of them.
I've tested my positioning by shifting the joystick off-center to theright or
left, and when this shadow shows it only shows on the right side ofthe picture.
It does not show during viewing -- only in the captured image. Different
patients, eyes and dilations show the same shadow.
When this problem occurred 5 years ago, each "shadowed" image was followed by a
misfire that did not register a blank image on the WinStation proofsheet.
The problem was fixed by Zeiss at that time, but now it has returned --
thankfully without the misfires so far. Zeiss cannot access their service
reports, so I'm asking if anyone has seen this artifact.
Thanks,
Richard Morrone
On Thursday, February 9, 2017 4:49 PM, Aissa Dirawatun <aissa9400@xxxxxxxxx>
wrote:
I agree with all the pointers Michael mentioned especially pupil size. Using 50
degree lens, pupil must be at least 6mm to get a decent photo in my experience.
I'm able to get fair photos on a 4mm pupil with the 30 degree. Smaller pupils
(hard to dilate pts) would only give me an okay ONH shots.
We still use FF4's and FF450's with great fundus photo results. It's all in the
technique, patient eye anatomy & cooperation.
:-)
Aissa
On Feb 9, 2017 3:21 PM, "jmc eye photo" <jmceyephoto@xxxxxxxxx> wrote:
richard
note pupil size on all patients where the shadow occurs.
measure the outer diameter of the projected view lamp and discover the zeiss
450 requires maximal patient dilation to work effectively and consistently.
the shadow is the edge of the iris slightly blocking the view lam and flash.
image 2 is centered in the pupil , thus, more evenly illuminated
darker pigmented pupils dilate less and really challenge the ability to
uniformly illuminate a retinal fundus.
we as photographers have no control of patient saccadic movements or shifts in
patient position after blinking.
best suggestion is a nonmyd with 4mm+ dilation for your patient.
how many people still use zeiss 450 or topcon 50ex out there these days.
no one seems to want to learn how to use them anymore
michael
john michael coppinger
jmc eye photo
www.jmceyephoto.com
On Feb 9, 2017, at 3:03 PM, Richard Morrone <rmorrone@xxxxxxxxxxx> wrote:
Has anybody seen the Zeiss FF450+ artifact in the attached image? Note the
shading that's arcing across temporal side of the image on the left. The only
difference between that and the image on the right is another press of the
trigger -- nothing else in the room has moved.
It's random, unpredictable. The shading might come halfway across the image or
a fourth of the way. I might get 1 or 4 at a time, which means more photos,
more flashes at the patient. It can happen during Colors, R-F's or FA's. It
shows up darker with poorly dilated eyes.
I've had two different Zeiss service technicians out recently to address this,
and one thought that it might be a part of the filter mechanism not getting out
of the way and that it would be an expensive job to replace it. This same
issue occurred 5 years ago, and the Zeiss tech did something simple that cured
the problem. Neither he nor I can recall what he did.
Any suggestions?
Thanks,
Richard Morrone, C.R.A.
<Artifact.PNG>
