BoldenEagle
Well-known member
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EF 300/f2.8 L IS USM II + 2x II + 2x III extenders (1 Viewer)
- Thread starter BoldenEagle
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Robert_Scanlon
Well-known member
Not bad, plenty of detail visible, nice shot.
BoldenEagle
Well-known member
Here is another try a couple of nights ago with less stopped down aperture and lower ISO.
ISO100, 1/160, f9.
Quite low temperature (about -15 C degree) so it took some time for the objective to cool down when brought outside, before that, image quality was terrible.
It's very difficult to manually focus at this focal length as one needs to magnify the screen at least 5x and even the slightest turn of the focusing wheel introduces vibrations...
Regards, Juhani
ISO100, 1/160, f9.
Quite low temperature (about -15 C degree) so it took some time for the objective to cool down when brought outside, before that, image quality was terrible.
It's very difficult to manually focus at this focal length as one needs to magnify the screen at least 5x and even the slightest turn of the focusing wheel introduces vibrations...
Regards, Juhani
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BoldenEagle
Well-known member
I'm afraid that daylight won't help as you anyway have to find the sharpest point by manually turning the focusing wheel (remember that my combination has 1920 mm focal length when using 1.6x crop sensor) and you still need to magnify the backscreen view by 5x or 10x to see the precise focus point.
Maybe using fine marker and make marks to the focusing ring and objective body when the sharpest point is found, that at least the next time I don't have to do focusing all over again?
Regards, Juhani
