Question about Zeiss Humphrey 740 Visual Field Analyzer

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Zeiss humphrey system startup state 19

Aperture may be misaligned

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I believe "state 19" is a weak main illumination bulb. Not sure if it's the same on your 740, but that's what the problem was with our 750i. Even though the bulb appears to be working, they dim over time and won't pass the start up calibration checks. On ours, there is a round access panel on top of the unit to service this bulb. Just be careful removing the bulb and don't bump any of the clear optical wheels. Part # 2660021106082 (for 750i. not sure about 740) Call Zeiss to confirm. Realize this is an old post so info is for future readers.

Posted on Jul 27, 2015

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Posted on Jan 02, 2017

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How does aperture setting affect a photograph?


The aperture is the opening in the lens through which light passes to the image sensor. Changing the aperture setting allows you to control the depth of field of a photograph. When the aperture is opened to a widersetting, (indicated by a lower f-stop number) more light is passed to the imagesensor, creating more shallow depth of field. Closing the aperture (indicatedby a higher f-stop number) allows less light to pass to the image sensor,creating wider depth of field.

NOTE: The aperture setting is one of three primary settings usedto control the overall exposure of a photograph. The other two primary settingsare ISO and shutter speed. Because the three settings work together to produce the overall exposure for a photograph, changingthe aperture setting will require complimentary changes to either the ISO or shutter speed to produce a properly exposed photograph. These changes will bemade automatically by the camera in the Auto, Program, Aperture-priority andShutter-priority modes.

There are two ways tocontrol the aperture setting on the camera:
  • Aperture-priority mode (A) - When shooting in Aperture priority mode (A), you set the aperture value and the camera automatically sets the optimum shutter speed for you.
  • Manual mode (M) - When shooting in Manual mode (M), you control both aperture and shutter speed, which gives you maximum creative control to achieve the exact results you want.

on Jan 08, 2011 | Cameras

1 Answer

Ziess /Humphrey atlas 990 servicing


You neef begin by the lowes part. You sjould rest the instrument on tje left side to get the botton screws.
In orther to take the covers you sjoul take away first the chinrest

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Where is the aperture ring on d80 Nikon


If you are using an older lens the aperture ring will be close to the camera body when the lens is on the camera. In order to set the aperture with a D80 and older lens you must set the aperture ring to "22" or the highest number on the aperture ring available. For newer lenses there is no aperture ring. You set the aperture by setting the dial on the top left of the D80 to "A" for Aperture Priority. You then set the aperture by rotating the front dial on the right side of the camera under the shutter release button. On older lenses, after setting the aperture ring to the highest number, you then set the aperture in the same manner.

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Why does my zeiss humphrey visual field machine keep shutting down?


Sounds like a heat, thermal issue. You may have a non- functioning cooling fan somewhere inside. There are several of them so don't be fooled if you hear one of them running. Same issue happens with CPUs on PC computers. Will suddenly shut off if too hot.

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1 Answer

Battery low in Zeiss Humphrey Acuitus 5015 Autorefractor Keratometer, what can i do?


The batery is a integrated circuit that is soldered to the Mother Board. You should disolder that circuit in order to replace it

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2 Answers

Autorefractor Humphrey Zeiss Acuitus 5015 not sharpen the image


The problem is in the mainboard, look for j conectors, and try to see if any is released.They control the step motor who can make the camera focus

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