So you're effectively looking for something like 28mm to something
between 300mm and 400mm. That's not too big... Well unless someone
has repealed the laws of physics that's not going to happen. I don't
think that can be made compact or light weight.
There is the FAJ 75-300 f4.5~5.6, but AFAIK nobody actually liked it,
and three different Pentax auto focus 100-300mm lenses, but I've never
heard any one say anything good about them optically, or equivalent
lenses from other systems and manufactures for that matter. So if can
find one they're probably going to be cheap.
There is a Sigma 70-300, that looks like the 70-210 that I was gifted
with about a year ago. If it's anything like the 70-210mm it's not
horrible, not great either, it will be very light, and extremely
inexpensive. KEH.com had one for about $35-40 in like new condition not
that long ago.
As to a longer max focal length, I've never heard of one. You might
start looking for a 400mm Catadioptric, Kenko currently makes one.
You won't find anything smaller or much lighter in that focal length,
but of course manual focus.
On 12/17/2016 9:33 PM, Larry Colen wrote:
Going to full frame, I no longer have a lens for the k1 to fill the niche of my
18-250, being reasonably long, if not particularly fast, but will still fit in
my camera bag and not weigh a ton.
The da 55-300, despite nominally being an aps lens seems to do ok on ff. Is
there anything even better, preferably not too expensive?
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