KentG

I have had more and bigger Sigmas that you including those telephotos plus all the way up to the Sigma AF 1000/8 APO but I seldom bought any WA lenses as most of what I did was motorsports ...

My fault. I wrote that in haste at the time. Should have read all lenses before DG can no longer be upgraded (as of 2005). That was the year the chips were no longer available. And yes Sigma ...

As far as I know Sigma does not update any lens older than the docking station ones currently. Older models required changing the ROM chips. The chips are no longer available to upgrade the older ...

First one is excellent. I love it. Kent Gittings

As both a photographer and as astro-photographer what you are doing is called nightscapes not astro-photography. Its not technically considered astro-photography (called AP for short) if anything ...

Hooray, someone knows something about photography. Its the perspective of 85mm in a film or FF sensor camera that makes it a facial portrait lens (75-95 can work fairly well either but it was not ...

Sort of. Since 85mm is a portrait lens only for FF cameras. With a crop sensor 55/1.4 is closer to the ideal portrait lens framing. Kent Gittings

Its not infinity that is talked about. Pretty much all of them are correct at infinity focus. Its when you focus closer that breathing occurs. Never really bothered me but then I am not a ...

Correct. My last film camera system was based on the Maxxum 9. My most loved camera system without doubt. Especially for motorsports shooting. But alas they spent so much time before the 7D came...

Well there is the Sigma 100-300/4 EX (DG) and then there is every other zoom that goes to 300mm that fits a Pentax camera. Its that simple. Problem is they have not been made in awhile , everyone ...

In my case I judged the upgrade to not be worth it for 2 reasons. I am fully capable of shooting action with a camera that has slower AF or even no AF. Plus my second system is Canon and there is ...

I had one of those Century II 500/5.6 lenses. I agree its sharp with some PF due to the 2 element telescope design. I had one in PK mount. I had it setup at my old estate house in MD with a camera ...

Thanks everyone. Its a non-A lens and its on the way. Not too far from me either, in PA. I noticed a how-to somewhere where someone added the A contact to a Ricoh lens. Anyone here ever tried that? ...

I have looked at the How-Tos on the pin issue in the past but never have owned a Ricoh lens in the 50+ years I have owned Pentax gear on and off. Thanks. Kent Gittings

My philosophy when I buy something that availability might disappear on is to buy all the optional parts that I can find for it. Best case I have all I need and worse case the parts will have ...

What's the word on this lens? Does it have that issue with the pin getting stuck on Pentax bodies? I have seen samples from it and its sharp although the contrast is lower at F1.2. I have a chance ...

Actually using a regular lens with the AFA 1.7x TC allows you to shoot even closer than just the lens itself. Remember its got its own focusing track so if you start out with the lens at minimum ...

Your crops are good, Phil. Do you think you will find yourself automatically shooting the shot wider just to make up for the vignetting crops? Kent Gittings

The only drawback of using an APS-C lens on a FF is vignetting in the corners which I can see plainly. Good idea to crop that out. I would rather not have to do that if possible. But can be done. K ...

What I use is the 150-450 on my K-1. Hardly anything else is available short of the rare Sigma big primes in K-mount, and then you have to worry about compatibility as many of them are no longer ...