Hi Bruce, Does the fact that the lens is reporting the wrong focal length render the S/R system on the K10D useless ?
I can't see myself inputting the focal length everytime I zoom especially if i;m following action (sports/nature). Regards Patrick On 8/20/07, Bruce Dayton <[EMAIL PROTECTED]> wrote: > I kind of doubt that very many people have both lenses to compare > with. When you say the 100-300 - I have to assume that you are > meaning the Sigma 100-300/4 EX lens. If so, I have that lens and can > give you a one sided report. I also have the Sigma 1.4X EX TC and > have used it many times with the lens. > > First of all, the TC attached does not adjust the focal length > transmitted to the body - it is just as if there was no TC there. So > if zoomed to 250mm that is what gets trasmitted - TC or not. > > My reading and viewing of information indicates to me that the > 100-300/4 is a better lens than the 50-500. One would guess that at a > similar price the shorter zoom range would be optically better. Also > it is f4 throughout the zoom range where the 50-500 is a variable > aperture changing as you zoom. > > I was looking at this very issue when I got my lens and it really came > down to how often would I be out towards the 500mm end. The only time > the 50-500 has any advantage is when you are at the long end. The > 100-300/4 is faster and arguably has better optical quality. Putting > the 1.4 on causes some losses. First, you are now at F5.6, second > there is a slight contrast loss (can be made up in PP), third is > focusing - I can tell the difference in speed and locking on to > subject with and without the TC. > > The 100-300/4 can be shot wide open and net excellent images - don't really > know if the 50-500 is good wide open. > > So for me, it came down to speed and optical quality. I decided that > the 50-500 was too slow for a good percentage of my shots. If you > would be spending most of your time zoomed out beyond 300mm, then the > 50-500 might be the better choice, otherwise I think the 100-300/4 EX > is the better lens. > > As far as ruggedness, I have shot somewhere between 20,000-25,000 > images with that lens (making it the most used lens I have) and it has > held up. > > > -- > Best regards, > Bruce > > > Sunday, August 19, 2007, 10:26:19 AM, you wrote: > > PG> I'm going to be needing a long telezoom approx 400mm at the long end > PG> for nature photography ... the 50-500 seems to be very popular for > PG> this type of photography. How does it compare with 100-300 + 1.4x TC > PG> combo ? > > PG> Regards > > PG> Patrick Genovese > > > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > -- Regards Patrick Genovese -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
