How to focus using the LCD monitor on the EOS 20Da.

Article ID: ART152542 | Date published: 05/22/2015 | Date last updated: 01/29/2016


How to focus using the LCD monitor on the EOS 20Da.


"Live View" mode enables you to adjust the focus manually while watching the image live on the LCD monitor. Two modes are available: FC 1, which provides 5x magnification (approximately 4% of the center of the image will be displayed on the LCD) and FC 2, which provides 10x magnification (approximately 1% of the center of the image will be displayed on the monitor).
  1. Set the Mode Dial to <M>.
  2. Select either "FC 1" or "FC 2".
    • Set the shutter speed to "buLb" and turn the <> dial further to select "FC 1" or "FC 2".
  3. Display the live preview.
    • Press the shutter button completely.
    • The live preview will be displayed on the LCD monitor while the shutter button is depressed completely.
  4. Adjust the brightness of the live preview.
    • Let go of the shutter button and set the aperture and ISO speed. Then check the live preview again that you have the appropriate brightness level.
  5. Manually adjust the focus.
    • Looking at the image on the monitor, turn the focusing ring until the live preview appears sharpest.
Adjusting focus
  • The focus should be adjusted within 30 seconds. Taking longer to adjust the focus will increase noise in the image.
  • Focus cannot be adjusted manually in "Live View" mode when using the following lenses, which employ electronic manual focusing:
    • EF 50mm f/1.0L USM
    • EF 85mm f/1.2L USM
    • EF 200mm f/1.8L USM
    • EF 300mm f/2.8L USM
    • EF 400mm f/2.8L USM
    • EF 400mm f/2.8L II USM
    • EF 500mm f/4.5L USM
    • EF 600mm f/4L USM
    • EF 1200mm f/5.6L USM
    • EF 28-80mm f/2.8-4L USM
  • Remote operation from a compluter using EOS Capture software is not possible when the camera is set to FC 1 or FC 2 mode
Using this camera for astrophotography
  • You cannot shoot photographs in FC 1 or FC 2 mode. When you have adjusted the focus, reset the aperture and ISO speed to take a photograph.
  • Wait 30 seconds after adjusting the focus before taking a photograph. Taking a photograph immediately after adjusting the focus will increase the noise in the image.
  • Long exposure times will inclrease noise. The following exposure times or less are recommended:





    8 min.

    4 min.


    16 min.

    8 min.

  • Sequential shooting will increase the noise in the images. When shooting photographs in sequence, you should wait an interval of time equivalent to the length of the previous exposure time before taking the next shot.
  • Astrophotography mainly employs bulb exposures, and therefore battery life is diminished. Please ensure that you are supplied with spare batteries. If possible, we recommend that you use the AC Adapter Kit (ACK-E2) supplied with the camera.
    • At normal temperature, a fully charged BP-511A battery will provide 2.5 hours of operation when shooting continuous bulb exposures.
  • When taking long bulb exposures, stray light may enter the viewfinder and affect the photograph. When you are shooting without using the viewfinder, the eyepiece cover should be used.
  • The supplied video cable can be connected to the video out terminal of the camera to enable an external monitor (TV, etc.) to be used in adjusting the focus.
  • When the camera is connected to a computer and EOS DIGITAL software is used, the name of the camera will appear as "EOS 20D" in the window.
Using this camera for regular photography

This camera is approximately 2.5x more sensitive to hydrogen-alpha light (656nm) than the EOS 20D. Photographs of normal subjects that reflect a lot of infra-red light taken with this camera will therefore appear more red than the actually are. An infra-red cutoff filter (commercially available) can be used to reduce this redness.



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