rajesh_krishnamohan Posted August 20, 2004 Share Posted August 20, 2004 Hello Pros, I would appreciate if someone could explain the effect of aperture size on the sharpness of the picture. Has it got anything to do at all? When I zoom using my Nikkor 70-300 mm on my D70,(300mm) and Aperture around 5-5.6, the pictures are not as sharp. The subject is about half a mile I should say. (Check the attached image). But it is not as sharp (though the zoom brings the object nearer). It was an overcast day and I do not think that it was affected by bad lighting. Please share your thoughts on what is optimal aperture size?? Regards<div></div> Link to comment Share on other sites More sharing options...
maury_cohen Posted August 20, 2004 Share Posted August 20, 2004 In most lenses, optimal sharpness is a couple of stops down from "wide open", which would place your lens at f/8-11. It also appears that the focus in your image is slightlycloser to camera than the aircraft. Link to comment Share on other sites More sharing options...
jbq Posted August 20, 2004 Share Posted August 20, 2004 I found when I used to have one of those that at the long end it really wanted to be stopped down to f/13 or f/16 (on film). On a D70 I'd go for f/13 as diffraction will quickly start to become an issue if you stop down more). Link to comment Share on other sites More sharing options...
vivek iyer Posted August 20, 2004 Share Posted August 20, 2004 If you are using a dark lens like this one on the D70 with AF, there will be focus hunting and inaccurate focus. If your eye sight/focusing ability with the D70 is good, try manual focus (is that possible with this zoom?). f/16 will not do any harm. I shoot at f/2 to f/22 on my D70 (various lenses). Do not see any effect of diffraction on the images as in film. Stopping down is good for sharp images with the D70. Vivek. Link to comment Share on other sites More sharing options...
armando_roldan Posted August 20, 2004 Share Posted August 20, 2004 It looks like you got a dust speck on your sensor. Check out that dark spot in the sky directly above the jets engine about 1/2 to the top of the image. Link to comment Share on other sites More sharing options...
rajesh_krishnamohan Posted August 21, 2004 Author Share Posted August 21, 2004 Hi, I checked my other pictures too. Looks like I have dust like you said. Thank you for noticing it. Now how do I clean it :-) Regards Link to comment Share on other sites More sharing options...
lachaine Posted August 21, 2004 Share Posted August 21, 2004 That lens is not bad, but it gets softer when you zoom in beyond 200mm. Link to comment Share on other sites More sharing options...
arthuryeo Posted August 21, 2004 Share Posted August 21, 2004 Just want to verify the basics here: what was the shutter speed when you took took that shot? Did you hand hold or was it on tripod? Link to comment Share on other sites More sharing options...
jsbc Posted August 22, 2004 Share Posted August 22, 2004 yep, what's your shutter speed? Link to comment Share on other sites More sharing options...
john_aceti Posted September 3, 2004 Share Posted September 3, 2004 Dont forget at an airport there is much diesel and heat variations in the air. This sometimes causes neat effects like what you see from the tail. I alos took some shots from airport (Honolulu) and without the UV haze on nor the polarizing filter attached on a 35 mm film camera. The photos came out quite poor. Link to comment Share on other sites More sharing options...
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