Originally posted by Craigbob Hi all,
I've got a 50-500 f/4-6.3 APO (NON OS) on it's way to me from Japan. I won an eBay auction on uit.. As I have a K-1 I didn't think I'd need the version with OS. What's the difference between the two aside from the optical stabilization and slighter larger aperture? Is the image quality the same? Will be be disappointed in this lens and wish I'd spent 3x the money for the 4.3 OS version?
I have the OS version with HSM. This is the current version for sale. The optical formula is different between the two. Some say the version with OS is sharper but I never found any direct evidence of it. The main difference is the optical stabilization and a newer multi coating on the elements. The newer version is also heavier due to the OS. Both versions use Special Low Dispersion Glass. I do not think there is a tremendous difference in the IQ between the two versions. My opinion is the current DG version has a tad warmer colors. They did reduce the minimum focus distance on the DG model which I found helpful.
*NOTES*
1. The 50-500 requires the Sigma mount modification to advoid scratching the body on your K-1. This is a free service provided by Sigma.
2. The 50-500 is big and heavy. I recommend a good sturdy tripod with gimbal or at least a heavy duty ball head.
3. It is possible to hand hold but I always tired out after about a hour.
4. The lens requires a lot of light. This is not a low light lens. You will be shooting with higher ISO's.
5. The lens needs to be stopped down for best IQ, F8-F11.
6. The 50-500 does not hold too well to heavy crops. Try getting as close to your subject as you can.
7. It can be a very rewarding and frustrating lens to use. It took awhile for me to get used to mine. It requires a whole new level of shooting style.
The OS is essentially redundant since the K-1 has such excellent SR already built in. You should be able to have a lot fun with your new Bigma.