Canon EF 300 F4 L USM - 05 March 2008

My equipment has a new member - 300mm Canon lenses. It is an older model - without image stabilizer.

I tried it under the sky. As you can see below, differences at aperture 4; 5.6 and 6.3 are minimal.

Technical information:
Optics:Canon EF 300 F4 L USM
Focal:300mm
Aperature:4
Exposure:6s
Pointation:unpointed
Mount:Astro-3 + EQ-2M motor drive system
ISO/ASA:1600
Camera:modified Canon 350D

Technical information:
Optics:Canon EF 300 F4 L USM
Focal:300mm
Aperature:4; 5.6; 6.3
Pointation:unpointed
Mount:Astro-3 + EQ-2M motor drive system
ISO/ASA:1600
Camera:modified Canon 350D
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