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View Full Version : Why Can't I Go Below f4.0?



Joe Davis
06-06-2005, 05:56 PM
I was just outside trying to take some shots of my kids in the sandbox getting all wet and nasty. The sun was going down and we were under a shade tree. I tried to use shutter speed 500 and ISO 800. My light meter said to use Av of 2.0 but my IST D won't go that low. And please don't tell me to lower my shutter speed. I realize that much.

Any suggestions to help a newbie?

Thanks

jamison55
06-06-2005, 06:10 PM
The Max aperture is based on the lens, not the body. I'd guess that your lens goes no wider than F4. It should tell you on the front of the lens.

Joe Davis
06-07-2005, 05:32 AM
Ah, ok. It is a Sigma 28-200 lens. I believe it says 3.5 is the lowest on the lens.

Thanks

Edienberg
06-07-2005, 10:09 AM
Where were you in the zoom range (between 28 and 200) when you took the picture? The widest aperture you can get at 200mm with that lens looks to be 5.6. I would guess that an aperture of f4 could be used around 40-50mm.

Joe Davis
06-07-2005, 10:23 AM
I was between 50-70mm.

I guess what I am trying to say is how do you get a good shot in low light (without a flash) when you want to turn your shutter speed up?

Thanks

jeisner
06-12-2005, 03:29 AM
I was between 50-70mm.

I guess what I am trying to say is how do you get a good shot in low light (without a flash) when you want to turn your shutter speed up?

Thanks

Higher ISO (although you said you were fairly high already) or the better option is getting a bright lens... A manual (M or A series) 50mm f1.7 is fairly cheap on ebay and a must have IMHO...

Bodryn
06-17-2005, 07:22 PM
This is good news! I already have an f/1.7 from one of my old Ricoh/Pentax film cameras. I think it may be from the K-1000 I found at a rummage sale that they sold for $5. Still had film in it and worked just fine. I think somebody made a mistake on that one!