Re: Sigma 170-500 APO
The two low points for the lens is the slow max aperture and the length it extends when zoomed. It is not a lens that can be used handheld (over 300mm), nor is it very useful for sporting events (due to the speed). I find that I get more use from my APO 300/F4. When I need the extra reach the APO 1.4x in combo with the 300 gives a little better results compared to the 170-500, in a package that is easier to manage. Of course this combo only reaches 420mm so it is not an perfect replacement for the 500mm. I have the 135-400, the speed is a little better but the extension when zoomed is troublesome. I occasionally use the lens as a wakkabout lens for wildlife. Regarding the 300 f/4 APO, this is a fine lens, it's a varifocal design, at infinity it is reported to be 321mm in focal length IIRC making the lens around 450mm when fitted with the 1.4 EX converter and focused at infinity. Regards, John John Whittingham Technician you can't be optimistic with a misty optic The information transmitted is intended only for the person to whom it is addressed and may contain confidential and/or privileged material. If you have received an email in error please notify Carmel College on [EMAIL PROTECTED] then delete all copies of it from your systems. Although Carmel College scans incoming and outgoing emails and email attachments for viruses we cannot guarantee a communication to be free of all viruses nor accept any responsibility for viruses. Although Carmel College monitors incoming and outgoing emails for inappropriate content, the college cannot be held responsible for the views or expressions of the author. The views expressed may not necessarily be those of Carmel College and Carmel College cannot be held responsible for any loss or injury resulting from the contents of a message.
Sigma 170-500 APO
Anyone have this lens mounted to their AF body...ideally a *istD? Feedback? Thanks in advance! == Brian Dipert Senior Technical Editor: Mass Storage, Multimedia (audio, displays, 2-D and 3-D graphics, and still and video imaging), PCs and Peripherals EDN Magazine: http://www.edn.com My blog: http://www.edn.com/briansbrain 5000 V Street Sacramento, CA 95817 (916) 760-0159, fax (781) 734-8038 mailto:[EMAIL PROTECTED] Visit me at http://www.bdipert.com
Re: Sigma 170-500 APO
Nikon version. Not bad, but i only have a few test shots. As suspected a tad soft at 500,but i'm impressed. Dave Anyone have this lens mounted to their AF body...ideally a *istD? Feedback? Thanks in advance! == Brian Dipert Senior Technical Editor: Mass Storage, Multimedia (audio, displays, 2-D and 3-D graphics, and still and video imaging), PCs and Peripherals EDN Magazine: http://www.edn.com My blog: http://www.edn.com/briansbrain 5000 V Street Sacramento, CA 95817 (916) 760-0159, fax (781) 734-8038 mailto:[EMAIL PROTECTED] Visit me at http://www.bdipert.com
Re: Sigma 170-500 APO
Brian, I have this lens in Pentax mount. Overall it is an OK performer. AF speed is average compared to others that I use with my *istD. Sharpness is pretty good at one or two stops down. It is best at mid range (250-400mm), just as you would expect with a zoom. The two low points for the lens is the slow max aperture and the length it extends when zoomed. It is not a lens that can be used handheld (over 300mm), nor is it very useful for sporting events (due to the speed). I find that I get more use from my APO 300/F4. When I need the extra reach the APO 1.4x in combo with the 300 gives a little better results compared to the 170-500, in a package that is easier to manage. Of course this combo only reaches 420mm so it is not an perfect replacement for the 500mm. Perry. On 2/21/06, Brian Dipert [EMAIL PROTECTED] wrote: Anyone have this lens mounted to their AF body...ideally a *istD? Feedback? Thanks in advance! == Brian Dipert Senior Technical Editor: Mass Storage, Multimedia (audio, displays, 2-D and 3-D graphics, and still and video imaging), PCs and Peripherals EDN Magazine: http://www.edn.com My blog: http://www.edn.com/briansbrain 5000 V Street Sacramento, CA 95817 (916) 760-0159, fax (781) 734-8038 mailto:[EMAIL PROTECTED] Visit me at http://www.bdipert.com -- Perry Pellechia Primary email: [EMAIL PROTECTED] Alternate email: [EMAIL PROTECTED] Home Page: http://homer.chem.sc.edu/perry
Re: Sigma 170-500 APO
As a follow up to my comments. Here are two examples from the *istD with the Sigma APO 170-500. Warning! Warning! Warning! These are full 6.1MP images straight out of the camera. Shot jpeg iso 800. EXIF intact. They are each over 2Mb. They are not retouched at all. No sharpening, so they will appear soft. I am only posting so that you can get an idea what the lens can do. http://homer.chem.sc.edu/perry/imgp1767.jpg http://homer.chem.sc.edu/perry/imgp1775.jpg Perry. On 2/21/06, Perry Pellechia [EMAIL PROTECTED] wrote: Brian, I have this lens in Pentax mount. Overall it is an OK performer. AF speed is average compared to others that I use with my *istD. Sharpness is pretty good at one or two stops down. It is best at mid range (250-400mm), just as you would expect with a zoom.
