[EMAIL PROTECTED] wrote on 09.08.04 7:58: > Right now the "digital lenses" on the market tend to be ultra-wides or > wide-zooms, which are not easy to produce fast for any image circle. > There's not much incentive for manufacturers to make, say, a 33/1.4 DA > (especially if you are one of those companies that actually MADE a > 35/1.4). Personally, I'd LOVE to see a 60/1.4 DA or 20/1.4 DA to get > some of my favorite focal lengths back, but I don't think it's gonna > happen. Most pros can apparently now work exclusively with f/2.8 lenses > and get away with it, which means mostly zooms except at the extremes. And there are some lenses with image stabilisation in Canon and Nikon, allowing you to shot at speeds up to three stops slower than normally and achieve sharp pictures. If you have f2.8 zoom that would be as you had f1 one in terms of possibility to shot without the risk of image shake...
> Look at the olympus E-system. The lenses are digital only, and pretty > fast. Of course the sensor is tiny. That's not true. 4/3 sensor is almost as tall as APS sized one. It is only narrower due to aspect ratio (4:3). > Unfortunately it is very hard to get "affordable" and "good" in super > tele, especially super tele zooms. The common wisdom is not to put > teleconverters on zooms, and most pros don't use 2x teleconverters because > the quality loss is apparently too high. > The only place I see pros using 1.4x converters on zooms is on the very > highly evolved 70-200 ultrapro things from Nikon and Canon. Apparently > the quality loss isn't unacceptable when using these very good > teleconverters with what are arguably the best lenses N and C have ever > produced. Oddly, I don't think either company makes a 100-300/4 EDIF-IS > zoom. Sigma, of course, makes a 100-300/4. I don't think there is any significiant loss of quality with not only genuine 1.4x TCs, but even with cheaper constructions like Tamron 1.4x. We have made some tests with Dario using SMC-F* 300/4.5 and this Tamron, and the difference in sharpness between naked lens and coupled with teleconverter was neglible. 2x TCs is another story though. -- Best Regards Sylwek
