Jump to content

sgl_imaging_challenge_2021_annual.thumb.jpg.3fc34f695a81b16210333189a3162ac7.jpg

APT live view problem...Help please!


Recommended Posts

Hi,

I am familiarising myself with APT by using it to control my DSLR (canon 550d), with lens attached, indoors, in artificial light.

I am setting up as per instructions (M, bulb setting, manual focus on lens) and am able to connect camera and get live view and take single shots and plans.

Changes in shutter speed affects the live image, as does changes in iso, but only up to a point where the image is slightly over exposed. After that, there is no difference in live view from say, 20 secs exposures upwards. The live view image of a 20 sec exposure is the same as a two minute one, though the actual recorded images are correct.

Is this a problem with the software, or does it protect the screen from showing a blown out out exposure, or is this even relevent when taking astro pics? What I am concerned about is that live view wont tell me if I am overexposing. This may not be a problem with deep space objects but could pose problems with the planets and moon.

Anyone had any experience with this? Does it sound like it's working as intended?

Thanks, Tim. 

Link to comment
Share on other sites

The display in live view is a "simulation" of the exposure and only really works over a limited range of lighting conditions... is the exp sim  text flashing...

From the CPN website...http://cpn.canon-europe.com/content/education/tipsandtricks/3142.do

Using Live View and Exposure Simulation

One of the greatest advantages of Live View shooting with Canon EOS DSLRs is the ability to see, on the rear LCD screen, a live histogram and an approximation of exactly what the final image will look like. When looking at the Live View image on the rear LCD screen, you may see ‘Exp.SIM’ (which stands for Exposure Simulation) shown in the bottom right hand corner of the screen. If this is shown in white, it indicates that the image you are seeing on the rear screen is close to what the final image will look like. If the ‘Exp.SIM’ is flashing it is probably because you are shooting in very bright or dark conditions, thus indicating that the image shown on screen will differ from that captured. If this is the case, you should judge your exposure from the histogram and exposure scale, rather than from looking at the LCD screen.

  • Like 1
Link to comment
Share on other sites

Thanks,

It works as you describe!  Problem is that I don't get the live histogram or exposure meter on APT (it will display the histogram of taken images, but not live view). When I connect APT to the camera, It turns the live view camera display off and just displays the image on the computer, minus the histogram etc etc. I can turn on the display on the camera so I have both available, but it seems quite complicated to an old geezer like me who is looking to simplify things.... 

Tim. 

Link to comment
Share on other sites

Hi Tim,

The LiveView will not help you to determine the right exposure for astro imaging ;) Also the exact exposure for LiveView can't be controlled precisely - you set what you want and the camera gives what it decides.

I definitely recommend the turn-off the display when you do astro because it is a source of serious thermal noise...

  • Like 1
Link to comment
Share on other sites

Hi Tim,

The LiveView will not help you to determine the right exposure for astro imaging ;) Also the exact exposure for LiveView can't be controlled precisely - you set what you want and the camera gives what it decides.

I definitely recommend the turn-off the display when you do astro because it is a source of serious thermal noise...

Thanks....   and battery loss as well... 

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.