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Photo Forum / Digital Photography / DSLR Cameras / June 2006MTF's Lens Reviews
For those interested in comparing sharpness of lenses, I found an interesting site: http://www.photodo.com/nav/prodindex.html Tien > For those interested in comparing sharpness of lenses, I found an > interesting site: > http://www.photodo.com/nav/prodindex.html > > Tien Useful for those who may not have seen it; it's been around a while. Problem is, "This page was last updated 5 juni 2000."  SignatureFrank ess Frank ess a écrit : > Useful for those who may not have seen it; it's been around a while. > Problem is, "This page was last updated 5 juni 2000." Yah, most of my lenses are from before that era. I find it interesting that a lot of the old AI manual focus lenses are just as good if not better than their AF counterparts. Where there seems to have been improvement is with the zooms. Tien > For those interested in comparing sharpness of lenses, I found an > interesting site: > http://www.photodo.com/nav/prodindex.html It's been a favourite reference for many photographers for a long time. Regrettably, it is poorly maintained (although they seem to have fixed most of the link problems) and not up to date with lens releases of the past few years. When comparing lenses at this site it is most important to ignore the "weighted" score for each lens. Instead, compare lenses by looking at the graphs at wide open and stopped down (usually f/8). If the sagital and tangential sharpness lines are realtively smooth and close together (for each pair at differing resolution tests), then it is a good indication of smooth bokeh performance. Of course, the "higher" the curve the better, and esp. a lower rolloff of the curve are indicative of better, usually sharper glass. Such sites are good in the sense of their independance and that they use a randomly selected lens. OTOH, they only test one sample of each lens so you have no idea if the presented lens is an exceptionally good one or an exceptionally poor one ... or representative of what you might acquire. Cheers, Alan Signature-- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: Remove FreeLunch. >> For those interested in comparing sharpness of lenses, I found an >> interesting site: [quoted text clipped - 4 lines] > most of the link problems) and not up to date with lens releases of the > past few years. I guess one of the reasons that the site is not maintained / updated is related to the demise of 35mm film. There is a site at: http://www.photozone.de/ Lenses are compared on a specific dslr body - it seems usually Nikon D200 and Canon 350d on the few reviews I looked at. Most data is for Canon, some Nikkor, and a few Olympus lenses, but the list is growing quite fast. You can't compare data such as MTF "cross-system" because of influence of anti-aliasing and in-camera processing, noise reduction etc, even if the sensor size and pixel count was the same, so there is little point using for example results of a Tamron lens reviewed on a Canon system against a Nikkor tested on a Nikon dslr. The reviews refer to testing of one sample - opening the doors to disputing this data based on sample variation. There is also some user-survey based data on this site - unscientific and probably subjective, but perhaps of some interest. >>> For those interested in comparing sharpness of lenses, I found an >>> interesting site: [quoted text clipped - 14 lines] > quite fast. You can't compare data such as MTF "cross-system" because of > influence of anti-aliasing and in-camera processing, noise reduction If the sensor delivers less than stellar performance that is a problem with the sensor, filters, processing, etc. No different than testing with film rather than an optical bench. The film / sensor is a limiting factor. Chasseur D'Images, a french photo magazine, does test various sensors (body models) with various lenses and does get differing results for a given lens. But again, that's the sensor data doing it. What they are doing is turning the individual body models into impromptu optical benches when used with their test software (DxO Analyzer). A lens is just a lens. Better lenses always give better results. "Better" is not just sharpness. Cheers, Alan Signature-- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: Remove FreeLunch. |
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