Guest

Problem With Sigma Lens

Sat Sep 08, 2001 8:11 pm

Hi guys

I recently purchased a SIGMA lens 100-300mm F4.5-6.7, and I am using a Nikon FM, with Kodak 200 Print.

After using it for a week, I've noticed all my shots are either blurry or have awful colour in them. Before I was using a Tamrom 70-210mm and I managed to get great sharpness and colour from it.

Does anybody know why I cant get the same quality or better quality shots?

Thanks
-Regards, VA
 
mirage
Posts: 3612
Joined: Mon May 31, 1999 4:44 am

RE: Problem With Sigma Lens

Sat Sep 08, 2001 9:47 pm

I have that Sigma 100-300 4.5-6.7 UC. I don't have that kind of problems, you can see my photos here to see the results of that lens with a Minolta 500Si.
The AF is a disaster, now I shoot always in MF.

Luis
 
Guest

RE: Problem With Sigma Lens

Sun Sep 09, 2001 12:11 am


I used to own that lens. (notice the choice of words). No more. Instead I bought the new Sigma 100-300 4.0 APO - it's great. color rendition is very good and its sharp too. its not all that expensive either which was surprising. the only drawback with it is the zoom control - its a bit stiff (but all Sigma lenses have stiff zoom control).

turbophan
 
Guest

RE: Problem With Sigma Lens

Sun Sep 09, 2001 12:51 am

Use reala or sensia 100 and dump the 200 kodak iso film. Use 1/500(action) or 1/350 for static for all your shots and you should have no more problems. If nothing has changed, exchange the lens. It might be bad one, but that highly unlikely.
 
Guest

RE: Problem With Sigma Lens

Sun Sep 09, 2001 1:36 am

I'm currently using 1/1000 or 1/500 depending on the light... the shots I took this morning (8 Sep) were very bad, even worse than my Jakarta shots. Not only were they blurred, but they were quite overlighted as well. I made measurements on my light meter before snapping, and it was in the "just right" range, so I really dont know the problem.

Kodak 200 hasnt given me any problems previously. I dont want to change to slides cos i dont have a slide projector, neither do i have a slide scanner.

I'll try to get a few scans of the bad and good shots for you guys.

-Regards, VA
 
Guest

RE: Problem With Sigma Lens

Sun Sep 09, 2001 1:55 am

Sounds like the camera is giving you bad light readings. It could be due to the lens not being 100% compatible with your camera body. I have the same problem because the meter battery is old and I dont have the $15 to replace it. What f/stops did you use when shooting in sunlight? f8 at 1/500 or f5.6 at 1/1000 should be about right.
 
Guest

RE: Problem With Sigma Lens

Sun Sep 09, 2001 2:19 am

oops, didnt notice that its max aperature is 6.7.
 
Guest

RE: Problem With Sigma Lens

Sun Sep 09, 2001 8:22 pm

CYKA,

The lens has a max aperture of 22... dont ask me why it says 4.5 - 6.7 but I try to usually use for 1/500 around F6.7 but unfortunately it gives me shots that are overlighted.. will try again with higher appertures..

Thanks
-Regards, VA
 
mirage
Posts: 3612
Joined: Mon May 31, 1999 4:44 am

RE: Problem With Sigma Lens

Sun Sep 09, 2001 8:53 pm

VA, 22 is the minimum aperture. At 100mm you have a maximum aperture of 4.5 and at 300mm you have a maximum aperture of 6.7.

At 300mm you can have a minimum aperture of 32.

Luis
 
Guest

RE: Problem With Sigma Lens

Sun Sep 09, 2001 10:20 pm

Mirage,

Oh I see, thanks. Do you think it would be a good idea if I used around 8 for daytime action shots?

Thanks again

-Regards, VA
 
mirage
Posts: 3612
Joined: Mon May 31, 1999 4:44 am

RE: Problem With Sigma Lens

Sun Sep 09, 2001 10:35 pm

I'm not an expert in technique but I think 8 should be used only in perfect light conditions. Personally I don't give priority to aperture, I prefer to give priority to shutter speed and keep it at least higher than 1/250.

Once I made 1500Km to Madrid by car, only to photograph planes. There I gave priority to aperture keeping it all the time at 8. I caught bad weather, cloudy days, the result were lots of blurried photos so I learn the lesson in the worst way.

Now I use all the time high shutter speeds, when the light doesn't permit me to use high speeds it's time to go home and be a "bad" guy at the Airliners.net photography forum  Big grin

Luis
 
Guest

RE: Problem With Sigma Lens

Mon Sep 10, 2001 3:11 am

My camera dosen't have shutter or aperture priority modes so I have to set everything manualy according to the condtions. If its a sunny or even slightly hazy day, I always leave the shutter at 1/500 and aperature at f8 and the photos always turn out nicely exposed. For evening shots I usually drop the f/stop to 5.6 or so. If a heavy cloud covers the sun then f4 is usally suitable but then I avoid shooting in such condtions.
 
da Fwog
Posts: 845
Joined: Thu Aug 19, 1999 5:25 am

RE: Problem With Sigma Lens

Mon Sep 10, 2001 6:30 am

If you are using ISO 100 film, then on a bright sunny day and with the sun shining full on your subject, you can use an aperture of F8 (which should give you better results quality-wise than using the lens wide open) with a shutter speed of between 1/250-1/500 sec. (if your camera goes in 1/2 or 1/3 stops, you should get around 1/350, 1/400 mostly I would expect - closer to the 1/500 than the 1/250). using ISO 200 film will give you double the shutter speed (1/800-1/1000 maybe) for the same aperture, or alternatively, allow you to close the lens down to F11 for the same shutter speed. If your camera is giving you exposure readings that are a lot different to this there are several possibilites: the metering is broken; the metering is not doing a good job on your subject; the metering is set in the wrong mode (maybe you are spotmetering off a part of the subject that is very dark or very light); there is a problem with the electrical contacts between the camera and lens (so the camera and lens are not communicating correctly); your battery is running flat; you have exposure compensation accidentally turned on (so you are deliberatly under or overexposing the image); your camera is either detecting the speed of your film wrongly, or else you have the wrong film speed selected. (And that's about all I can think of at the moment)

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