Since I bought my 70-300mm, I've been practising more with birds-in-flight at a local park. Long way to go, though, in getting sharp stuff.
Harrier and tree swallow were taken a couple of days ago, the others this morning.
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Northern Harrier.
Attachment 66561
Camera: PENTAX *ist D
Lens: SIGMA 70-300mm F4-5.6 DG MACRO lens
Other equipment: Supplied lens hood
Shutter-speed: 1/16000
Aperture: F6.3
ISO: 400
Focal length (optical): 300mm
Focal length (35mm equivalent): 450mm
Focus mode: Center-point, AF-C
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Tree Swallow.
Attachment 66542
Camera: PENTAX *ist D
Lens: SIGMA 70-300mm F4-5.6 DG MACRO lens
Other equipment: Supplied lens hood
Shutter-speed: 1/2500
Aperture: F13
ISO: 800
Focal length (optical): 300mm
Focal length (35mm equivalent): 450mm
Focus mode: Center-point, AF-C
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Violet-Green Swallow.
Attachment 66556
Camera: PENTAX *ist D
Lens: SIGMA 70-300mm F4-5.6 DG MACRO lens
Other equipment: Supplied lens hood
Shutter-speed: 1/1250
Aperture: F8
ISO: 800
Focal length (optical): 260mm
Focal length (35mm equivalent): 390mm
Focus mode: Center-point, AF-C
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Male mallard.
Attachment 66543
Camera: PENTAX *ist D
Lens: SIGMA 70-300mm F4-5.6 DG MACRO lens
Other equipment: Supplied lens hood
Shutter-speed: 1/1600
Aperture: F7.1
ISO: 800
Focal length (optical): 300mm
Focal length (35mm equivalent): 450mm
Focus mode: Center-point, AF-S (forgot to switch to AF-C)
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Male & female Northern Shovellers.
Attachment 66544
Camera: PENTAX *ist D
Lens: SIGMA 70-300mm F4-5.6 DG MACRO lens
Other equipment: Supplied lens hood
Shutter-speed: 1/1250
Aperture: F8
ISO: 800
Focal length (optical): 300mm
Focal length (35mm equivalent): 450mm
Focus mode: Center-point, AF-C
Thanks for looking.