when i first saw this i could not help but think of a city made of ice, far in the distance in the fog! i had to look it up to find out those were radio towers...i couldn't for the life of me figure out what thay might be! strangely whimsical image!
It's a nice, chilly picture, the sharpness is not perfect but at 300mm length that was to be expected I guess. I guess you used the 70-300VR Nikkor, maybe you'd want to try the same picture with f8.0 the next time. That's no critique, just a note, cause I know the characteristics of those 70-300 lenses well(I sell that stuff at a local camera store and people can be very persistent if they think their lenses don't work as they'd like ^^).
Well enough on the tech side, the composition is good and I know how hard it is to get a picture like that "done" -Though you might want to make it a panorama like image by cropping half of the sky out.
No, no, f8.0 is no other lens, it's merely using a smaller aperture of your main lens. You need to use the "A" Setting of your camera for that(just spin the 'wheel' ), you must know that every lens get's better to the center of it and by stopping down(that's what you call it if you make the aperture smaller) to f8.0 you'll use only the finest area of the lens, but you'll need more light too, as less light can enter the lens at once. Overall sharpness will rise that way.
Two years is a little old for that macro lens I fear. I don't believe sigma will fix it by warranty anymore. You should bring the lens to where you've bought it or you could contact sigma directly I guess. I wouldn't buy another one if the old one can be fixed. While there are better macros out there already(like the Nikkor 85mm VR) for arround $400-500, your lens still remains great in quality.
gotcha - smaller aperture if i put the camera on a tripod - what can i do to keep the lens open longer so more light is allowed in?
i just put the macro lens on my camera - and it's working seems there is a toggle switch for limit and full and when i choose full it works just fine but when i choose limit - it now tries to focus but never does which is an improvement - last time i tried - the lens would not even try to focus
thanks again for all your help - you jusst saved me $500.00