Jonathan, Thank you for your interesting and numerous questions.
My original posting was just to give my initial impressions of the lens. Before doing any work with it, I ran two rolls of film (Velvia and Tech Pan). Both looked great (I use a 16x achromatic loupe). Beyond this I just look out for the lenses characteristics under work conditions. However, time permitting, I will test and report back on your queries. Watch this space! Regards Craig Z ----- Original Message ----- From: "Jonathan Kwok" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Saturday, October 20, 2001 4:10 AM Subject: RE: EOS 70-200L IS - First impressions > From your report, the lens sounds like a dream come true. Like many others > on this list, I have been contemplating this lens, but the realization that > it contains more lens elements than any other AF lens in the world has been > a cause for concern. > > With so many elements, chances of lens decentering (element misalignment) is > increased unless Canon's quality control is spot on. I've seen some samples > of 70-200L lenses having one of its corners noticeably softer probably due > to a slightly less than perfect alignment of the elements. > > My other concern was the loss of micro detail and lower light transmission > due to the extra glass. I mean, it could be rated at f/2.8, but may actually > transmit marginally less light due to internal reflections. How about trying > both lenses on your 1n and see if they give the exact same readings at f/2.8 > (AV mode) when pointed at the same subject under similar lighting > conditions? > > I presume the colour rendition and contrast of both lenses are also similar? > > Your observation of the improved AF performance is the first I've user > report I've read and that's welcome news. > > Another interesting observation you made was the shift in focus when > zooming. Not so good news, but I doubt it will be a problem under real > shooting conditions since I always instinctively refocus after zooming. > > I certainly do not expect this lens to have better flare resistance than its > older sibling, but to equal its performance in this department (as you > mentioned) is indeed wonderful. BTW, how does it flare? Meaning, when it > does flare, does it have huge orange hot-spots when pointed into a strong > light source or does it exhibit veiling glare and ghosting? > > Finally, how is the handling? Does the extra weight affect the balance and > do you find this weight increase noticeable compared to the older lens? Has > the quality of its construction improved, as in, does it seem more robust > than the older lens besides being more weather resistant? Is the rear > element sealed or are there gaps where dust can enter the lens barrel via > the corner gaps in the rear element (as with the old model)? * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
