Live view image resultion to low for Bahtinov mask

[ChristianR]

Description

I’m unable to focus my Skywatcher Esprit (80/400) scope with Canon EOS 6D (full-frame) with Bathniov mask in live view.

When I zoom in, I see the stars “pixels” and no spikes.

Steps to Reproduce

• Put Bathinov mask on scope (Skywatcher Esprit 80mm aperture, 400mm focal length)
• Connect DSLR camera (EOS 6D, Pixel size 6,5 µm, resolution 5.472 x 3.649 Pixel)
• Set high ISO value (e.g. ISO 25600)
• Enable live-view
• Zoom in (200-400%) to see the spikes

Expected behaviour

• See spikes in nearly the same resolution as with snapshot (e.g. ISO 25600).
• Same as with e.g. cameras internal screen and magnify button or APT and 10x zoom

Actual behaviour

• I can see pixels arround the star but no fine spikes.
• It seems as the zoom works on the basis of a low resolution overview image

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Attached samples: Vega 455% (without batinov mask) + Snapshot with bahtniov mask

[ChristianR]

After some daystime tests, I figured out Raw converter = DCRaw (Options -> Equipment) leads to a more relastic live view and higher resolution for Canon EOS 6D.

[ChristianR]

Solved with Raw converter = DCRaw (Options -> Equipment) for Canon EOS 6D.