Two reasons: 28 is not wide enough and 24-90 has much better quality which is
reflected on the price. BTW the best 28-105 seems to be the elderly Pentax Power Zoom
version.
Actually a good quality 24-70 would be OK for me because I have observed that most of
the time I don�t need any longer than that (but the extra 20 mm is good to have - and
a good 24-105 would be even better).
The diminishing apertures are mostly due to size and weight considerations: the
3.5/35-105 weighs 615 g (heavy!) and the 24-90 only 375 g. And it really is easier to
design a slow good quality lens which would also be cheaper to manufacture.
The choice of focal lengths is a very personal one - what works for me does not
necessarily work for you.
All the best!
Raimo
Personal photography homepage at http://personal.inet.fi/private/raimo.korhonen
-----Alkuper�inen viesti-----
L�hett�j�: Martin Trautmann <[EMAIL PROTECTED]>
Vastaanottaja: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
P�iv�: 25. kes�kuuta 2001 18:19
Aihe: Re: SMC A 35-105 vs. SMC FA 24-90
>On Mon 2001-06-25 (18:12), Raimo Korhonen wrote:
>> I have both lenses and I also did a little comparison. The lenses have
>> quite similar quality, the 24-90 perhaps having a little bit more
>> contrast and sharpness. The difference is not big but the new lens is
>> much lighter (due to more plastics) and much more versatile. The 24-90
>> is my new favourite, expensive but worth it.
>
>Why this one and not e.g. the 28-105?
>
>And a different, general question:
>
>Why do newer lenses offer inferior aperture values? I thought that new
>materials and formulas could permit for brighter lenses?
>
>In fact I was told that the maximum aperture does not depend on the
>quality or groups of the lenses, but only on geometry (front lense,
>length)?
>
>I do not get this point, since the 35/105 is labeled 'f/3.5' for the full
>range.
>
>The new lenses are
>FA 24-90/3.5-4.5
>FA 28-105/3.2-4.5
>
>Regards
>Martin
>
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