teleconverter

[Gravityhotspot]

I purchased a sigma lens to take pictures of my son's swimming and gymnastics events. If I buy a teleconvertor will it slow the lens down from it's fixed f/2.8?

Thanks ,

Rob

[CyberDyneSystems]

Yes it will. (the f/2.8 isn't "fixed" by the way,. it is the maximum aperture.. but it is adjustable)

The 1.4X will result in an f/4 maximum

the 2X T-con will result in a max of f/5.6

The Sigma 1.4X works very well with the 70-200mm f/2.8 (is this the lens you have?) The 2X works fine but there is a noticeable degradation in quality.

[Gravityhotspot]

Yes this is the lens I have. As you can tell I'm a picture taker not a photographer. I also have a 70-300 that we've tried to use but with the light available you just can't stop the motion. We used our new lens at a swim/dive meet last week and our pictures were not underexpsoed. I did noticed the 70-300 with a 1.6 multiplyer gets a lot closer than the 200. I think the 300 has a f/4.0 zoomed all the way in so a converter may not help me out inside. I'm still getting some blur on hands and feet. I think one of the trick/skills I need to develop is to take the picture at a very slight pause or maybe get into position so that the movement is toward me. I've just now started to play with RAW files and maybe underexposing slightly and then fixing the photo like sugested in another thread will help. What we can't get over is the freedom to take as many shots as you want without fear of huge film and developing cost. We get on average one good shot for about every 25 taken (good in our terms) so it has been worth every penny we've spent. Who knows maybe on day I'll be a photographer! Lots of great info and help on this site. Thanks, Rob