Sigma vs Nikkor 70-300 on a film body?

[bhop]

So, I recently bought a Nikon F100. I want a telephoto zoom. I'm probably going to save up and get an 80-200 f/2.8 D eventually, but in the meantime, I want to get a cheaper used zoom. I'll use it sometimes with my d70 as well, but probably not often.

The top contenders so far are:

-Sigma 70-300 f/4-5.6 APO
-NIkkor 70-300mm f/4-5.6D ED AF
-I've also looked around at the older Nikkor 75-300 f/4.5 AF lens, which it seems a lot of people have good things to say about compared to the newer 70-300, so maybe I should throw that in too.

All can be had for around $100-150 depending on its condition

Aside from image quality, one thing that I want to know about is focusing speed. I have a Sigma 24mm 1.8 and it's a SLOOOW focusing (on my d70), heavy lens. It is a very crisp lens though and gets the job done nicely when I use it.

Also, since i'm going to be using it mostly on a film body, and the Sigma APO seems to be optimized for digital, is there any reason why I shouldn't get the older cheaper version of it?

So, any thoughts?

 

[epp_b]

I assume you're not talking about DX and/or G lenses, right?

 

[bhop]

I assume you're not talking about DX and/or G lenses, right?

Correct.

 

[Overread]

I have read that the sigma 70-300 is better as a film camera lens than as a digital camera lens with regard to image quailty. The other thing is the sigma does have close focusing (1:2 macro) which means that it might be slower than the Nikon if it gets to having to hunt a little.