A Great Stuff for Photographer by Sigma

With so many needs of photography shoots, sometimes we need an uncanny lens to capture a great picture. For everyone who has a big budget to get any lens without compromise, maybe it never being a matter at all. But for the others, who have a limit in their budget to get any one of them (also a photographer like me :-) ), finding an alternative great lens with more valuable price are most important thing to save the rest of budget for the other things :-). So…if u’re in a same case with me, here I’ll try to give u nice report from one of big lenses manufacture, Sigma. This products was an old stuff (came out in October 2002), but still this stuff could be a great “things” for every photographer. Here we go to see their review

Sigma APO 80 - 400 mm F4.5 - 5.6 ES OS

Specification :
Focal length 80 - 400 mm
Max. Aperture F4.5 - F5.6
Min. Aperture F22 (wide)
Construction 20 elements in 14 groups
Focusing system Rear focusing
Angle of View (35 mm) 30.3° - 6.2°
Diaphragm blades 9 pieces
Minimum focus distance 180 cm
Filter size 77 mm
Dimensions Diameter 95 mm (3.7 in) x Length 192 mm (7.5 in)
Weight 1650 g (58.2 oz)
Mounts (AF) Sigma AF, Canon, Nikon (D) 
Field of view (SD9) Field of view crop approx. equiv to: 136 - 680 mm on Sigma SD9

Press release:
“An ultra-telephoto zoom lens, which overcomes image blur caused by camera shake

Sigma APO 80-400mm F4.5-5.6 EX OS is one of several new products to be introduced at Photokina 2002 by Sigma Corporation of Japan (2-3-15, Iwado-Minami, Komae-shi, Tokyo, Japan). Sigma's OS (OPTICAL STABILIZER) system detects camera shake by utilizing two sensors, and then the movement of an optical stabilizing lens group successfully compensates image blur. It is equipped with two optical stabilizer modes to compensate image blurring. Mode 1, determines the camera shake in vertical and horizontal panning and compensates blurring, this mode is effective when shooting static images. 
Mode 2, detects the vertical camera shake, and overcomes blurring. It is especially effective on moving subjects such as motor sports etc. 
Two Special Low Dispersion (SLD) glass elements in the front lens group and one in the rear group offer effective control of color aberration. The lens features full-time manual focusing and a removable tripod collar. The rear focus system prevents the front of the lens rotating; a circular polarizing filter can be easily attached and used. This lens is also equipped with a Zoom Lock Switch that eliminates "Zoom Creep". When this lens is used with the 1.4x EX or 2x EX Apo Tele Converters (optional), it becomes a 112-560mmF6.3-7.8 MF telephoto lens or a 160-800mm F9-11 MF ultra-telephoto lens respectively. The lens materials used in this new lens are lead and arsenic free ecological glass.”

Comments : Just as a habit of Sigma when renaming their products, “OS” (Optic Stabilizer) title behind a product names are similar meaning with VR in Nikon’s Lenses. It’s more important thing for a lens that has a long focal point such as this product. With OS function, any blurry picture that usually came when a lens are shaking in their long zoom can be reduced optimally. For it Aperture value, I think it’s still interest enough (even some photographer need more big aperture such as F 2,8 or etc, to have a great light composition in a dark condition), this stuff still a right choice (for me) for any outdoor photographers.