Using a 2x extender

[johnrmoyer]

Sometimes I see people advise against using a 2x extender. I frequently use one when there is enough light and I cannot get closer to the subject

Benefits:

• doubles focus length
• doubles magnification
• costs less than a 800mm lens when one already has a 400mm lens
• Canon extender images can be improved by digital lens optimizer in DPP

Disadvantages:

• decreases aperture
• shallow depth of field
• increases F Number
• a higher ISO or lower shutter speed will be needed
• small aperture diffraction blur

Ruby-throated Hummingbird (Archilochus colubris) on Salvia greggii flower in Norman, Oklahoma, United States on July 9, 2024

EXIF:Image	ExposureTime	1/1600
EXIF:Image	FNumber	13.0
EXIF:Image	ISO	2000
EXIF:Image	LensModel	EF100-400mm f/4.5-5.6L IS II USM +2x III
EXIF:Camera	Model	Canon EOS R5
MakerNotes:Image	FocusDistanceUpper	4.96 m