What's an "optical purist"?
Is that someone who likes quality?
Exactly, 'jekostas" ... according to you and the "others", if you are not willing to spend the $500 for T/Cs and whatnot ... STOP shooting images. Just STOP it.
According to these "pursists", they ask, "What is wrong with you people? If you you are not willing to pony up top dollar for the best and brightest, you are not worthy to post anything! STOP SHOOTING IMAGES!"
Thanks guys, for making the point. I knew I could count on ya! ;) Some folks are soooooo predictable. Attachment 50573
Although I will admit, it is darn nice to have a $1000 optic to go to, when you need it. In fact, having several is a fine option, too. Criipes, why not the whole bag? Oh yeah, that costs real money... Oh, where's the U.S. Senate and House of Reps when you need 'em, eh? They can spend our tax money like hogs to slaughter of innocents. What not throw top drawer glass for all good little girls and boys in an amendment? Just watch what happens this week! Abortions ... and everyone gets to pay for it. Now, that's a good use of my hard earned cash, birth control on MY dime. You play, I pay! Gee, thanks. May I have another?
The biggest problem you face using T/Cs is that dedicated or matched teleconverters are specially design for certain lenses to achieve optimum performance. There are only 3 dedicated/matched teleconverters for Minolta AF:
1. Minolta APO / Sony APO
2. Kenko Pro 300 (Pro 300 DG) / Tamron SP
3. Sigma EX / EX DG
Dedicated/Matched teleconverters are only for specific lens because the distance between the first element and the mount is much shorter than 8-9mm therefore it will not physically fit with all lenses.
Okay ... let's say the "purists" win ... and we have to use REAL lenses ... and not some bastardized version of something we are toting around due to weight constraints and vacation locales ...
How much we talkin'?
SIGMA APO 500mm F4.5 EX DG/HSM (7 lbs) -> $4,099
SIGMA APO 800mm f5.6 EX DG HSM (10.5 lbs) -> oops, no SONY-mount. If there were, $6799
Of course these bazooka-shaped pipes are an easy tote (NOT). With the use of SIGMA EX T/Cs, you can vary their length.
Sigma 824205 Sigma 1.4X EX DG APO Teleconverter for Minolta/Sony AF -> $209
Sigma 876205 Sigma 2X EX DG APO Teleconverter for Minolta/Sony AF -> $259
Sigma EX Teleconverter
The Sigma EX teleconverter or EX DG is a dedicated teleconverter designed for Sigma EX series telephoto and telephoto lenses:
Like other dedicated/matched teleconverter, its front element also sticks out of the lens tube. The Sigma APO EX DG teleconverters lens element actually stick out between 2-3mm beyond the lens mount and therefore it will not fit all lenses.
Note: Sigma has now introduced HSM lenses for Sony but according to users report the current Sigma 1.4X or 2X EX DG teleconverters are not compatible with its HSM lenses. Sigma is planning to introduce new teleconverters that are compatible with HSM lenses but the exact release date is still TBD.
and coming up with a 720mm f/6.3 and a 1000mm f/9 for the SIGMA 500mm f/4.5
and if we could actually get a SIGMA 800mm f/5.6, make up a 1120mm f/8 and a 1600mm f/11
These have to be amazing to see on a backpack. Probably would look more like "rocket-man."
Anyway ... real lenses eliminate the T/C conundrum, but are quite limited in the SONY realm. Getting out there can be a chore, no matter what you pick, at this point. I sense that next year, things will change, once again, when it comes to the LONG SHOT. ;) So, we live with fuzziness and smile.
if you want to prove your point, take an ACTUAL shot of something decent with that setup to shut everyone up.
if i want that sort of range, the money is better spent on a superzoom imo.
Or, you could just not use teleconverters and work with the glass you have.
I know, I know, strange thought.
I'll remember to tell the ship's captain to pull in a little closer to that ICEBERG, as I get a shot of the polar bear sipping on the real thing.
so show us a shot of the polar bear.
And, what good is the shot of that polar bear if you have to explain to everyone that views it, "that's a shot of a polar bear" because it's so blurry and lacking in contrast they can't tell what it is?
It's painful to see a 3x teleconverter put on such a nice piece of glass.