Is the Sigma 500mm F4 DG OS HSM Sport a Weather Sealed lens?

Is the Sigma 500mm F4 DG OS HSM Sport Weather Sealed

$5,449.93

Sigma 500mm F4 DG OS HSM Sport Alternatives in Nikon F (FX) Mount

Model		Focal Length	Max Aperture	Weight	Focusing	Price
	Nikon AF-S Nikkor 400mm f2.8D ED-IF II	400mm	F2.8	4800gr	AF	$9,999.00
Compare with Sigma 500mm F4 DG OS HSM Sport
	Nikon AF-S Nikkor 400mm f2.8G ED VR II	400mm	F2.8	4620gr	AF	$9,999.00
Compare with Sigma 500mm F4 DG OS HSM Sport
	Nikon AF-S Nikkor 500mm f4D ED-IF II	500mm	F4.0	3800gr	AF	$1,339.00
Compare with Sigma 500mm F4 DG OS HSM Sport
	Nikon AF-S Nikkor 500mm f4G ED VR	500mm	F4.0	3880gr	AF	$8,396.95
Compare with Sigma 500mm F4 DG OS HSM Sport
	Nikon AF-S Nikkor 600mm f4D ED-IF II	600mm	F4.0	5900gr	AF	$1,339.00
Compare with Sigma 500mm F4 DG OS HSM Sport
	Nikon AF-S Nikkor 600mm f4G ED VR	600mm	F4.0	5060gr	AF	$8,748.40
Compare with Sigma 500mm F4 DG OS HSM Sport
	Nikon AF-S Nikkor 400mm f2.8E FL ED VR	400mm	F2.8	3800gr	AF	$11,196.95
Compare with Sigma 500mm F4 DG OS HSM Sport
	Nikon AF-S Nikkor 500mm F4E FL ED VR	500mm	F4.0	3090gr	AF	$10,296.95
Compare with Sigma 500mm F4 DG OS HSM Sport
	Nikon AF-S Nikkor 500mm F5.6E PF ED VR	500mm	F5.6	1460gr	AF	$4,900.51
Compare with Sigma 500mm F4 DG OS HSM Sport
	Sigma 500mm F4.5 EX DG HSM	500mm	F4.5	3150gr	AF	$4,499.00
Compare with Sigma 500mm F4 DG OS HSM Sport

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