Sigma APO 100-300/4 EX IF HSM User Manual (en)

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82mm filter thread
diameter
●   
accessories included:
bayonet hood (reversible
for storage) and a
durable, padded nylon
lens case
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street price;
approximately $850
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In the Field
As with Canon's USM lenses, focusing performance is fast and silent with both the EOS 1n and Elan 7E. While no side-by-side
comparisons with my Canon EF 300/4L were made in terms of autofocus performance, I can say without hesitation that I did not
notice any major difference between the two in this regard.
Optically, the Sigma performed extremely well. While there was noticeable barrel distortion
at 300mm (far less at 100mm), the lens delivered razor sharp images with accurate color
rendition and excellent contrast. Since barrel distortion is only noticeable on straight lines
that appear near the edge of the frame, it's essentially a non-issue with most nature and
wildlife subjects. With the addition of Sigma's APO 1.4 EX teleconverter, the lens has an
effective focal length range of 140mm to 420mm and a constant f/5.6 aperture. With the
teleconverter attached, there was a very slight degradation of autofocus performance, as
well as a very slight loss of sharpness and contrast, which is expected whenever a
teleconverter is used. However, even with the teleconverter attached, image quality
remained excellent. The most noticeable effect of the teleconverter (in terms of image
quality) was light fall-off in the corners of the frame with the lens wide open at f/5.6, which
was substantially reduced by f/8. No light fall-off was apparent when the lens was used
alone.
Final Thoughts
The Sigma APO 100-300/4 EX IF HSM is a unique lens...no other manufacturer makes a
model like this (Tokina makes a 100-300/4, but without HSM/AF-S/USM focusing). Price
wise, the Sigma falls approximately midway between the "consumer" level 100-300 zooms
(around $300) and lenses like Canon's 100-400/4.5-5.6 L IS and Nikon's 80-400/4.5-5.6 VR
($1500 plus). From an image quality standpoint, it performs much more like the Canon
100-400 and Nikon 80-400 (the Nikon does not offer internal focusing, internal zooming or
AF-S). Interestingly, it matches or outperforms all of these lenses in terms of lens speed
(maximum available aperture).
For those nature photographers looking for a high-quality zoom telephoto in this price range with all of the performance and features
offered by the Sigma APO 100-300/4 EX IF HSM, there's simply no other game in town...no compromise required.
About the Images
Sigma's APO 100-300/4 EX IF HSM telephoto zoom lens.
1.  
Cottontail Rabbit (Sylvilagus floridanus) - Sigma APO 100-300/4 EX IF HSM, APO teleconverter 1.4x EX, Canon EOS 1n,
Bogen 3221 tripod, f/5.6 in AV mode (shutter speed unrecorded), Fuji Provia 100F. Wide open at 5.6, the lens/teleconverter
exhibited excellent sharpness and contrast, though light fall-off in the corners was evident.
2.  
Mullein (Verbascum thapsus) - Sigma APO 100-300/4 EX IF HSM, APO teleconverter 1.4x EX, Canon EOS 1n, Bogen 3221
tripod set up at lens/teleconverter MFD, f/16 (shutter speed unrecorded), Fuji Provia 100F. At f/16, sharpness and contrast
remained superb. No light fall-off anywhere in the frame was visible.
3.  
JE-NPN 001
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