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Random blurry images with manual 105 f/2.5 Nikkor-P on D3300
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<blockquote data-quote="Marcel" data-source="post: 503214" data-attributes="member: 3903"><p>Let's start at the beginning. You seem to be mentioning 2 problems that are different.</p><p></p><p>The focusing. </p><p>Focusing with modern dslr is difficult until you replace the focusing screen as was mentioned before. </p><p>Make certain that your diopter adjustment is perfect for your eyesight.</p><p>Install the camera on a sturdy tripod and manually focus on a non moving object with enough light. After finding the focus to your best of ability, turn on the LiveView, look at your camera's screen and press the "+" button a few times. This will magnify the LiveView and you will then be able to see the real focus. Sometimes, there could be a discrepency between the focusing screen in the camera's viewfinder and the actual sensor distance from the lens' focal plane.</p><p></p><p>Now for the movement you are feeling when you press the shutter and the overexposure...</p><p></p><p>This can be the diaphragm of the lens that is slow to close to the chosen aperture. You can check it with the lens off-camera by playing with the aperture lever behind the lens and see if it moves really fast and if it comes back in place very quickly when you release it. This could explain the overexposure you would get when you close the aperture. You can also check in "A" mode by varying the aperture on the lens, the camera's shutter speed should adjust accordingly to what it expects the real aperture to be. If you see that the more you close down the aperture the more overexposed your shots are (for the same scene), then the aperture blades are sticking. Sometimes, I have the same feel of focus moving with my 35 Ais and you may be right that it could move. Or is it just the diaphragm closing making this weird vibration, I don't know for certain. But I try to hold the focus ring when I shoot this lens to prevent this "focus shift".</p><p></p><p>Good luck.</p><p></p><p>Here's a shot I did with the 105 on a Df, iso 3200.</p><p></p><p><a href="https://flic.kr/p/x8k1gf" target="_blank"><img src="https://farm4.staticflickr.com/3816/20429983292_a8e6cea421_h.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a><a href="https://flic.kr/p/x8k1gf" target="_blank">MCC_9339.jpg</a> by <a href="https://www.flickr.com/photos/57847082@N05/" target="_blank">Marcel Carey</a>, sur Flickr</p></blockquote><p></p>
[QUOTE="Marcel, post: 503214, member: 3903"] Let's start at the beginning. You seem to be mentioning 2 problems that are different. The focusing. Focusing with modern dslr is difficult until you replace the focusing screen as was mentioned before. Make certain that your diopter adjustment is perfect for your eyesight. Install the camera on a sturdy tripod and manually focus on a non moving object with enough light. After finding the focus to your best of ability, turn on the LiveView, look at your camera's screen and press the "+" button a few times. This will magnify the LiveView and you will then be able to see the real focus. Sometimes, there could be a discrepency between the focusing screen in the camera's viewfinder and the actual sensor distance from the lens' focal plane. Now for the movement you are feeling when you press the shutter and the overexposure... This can be the diaphragm of the lens that is slow to close to the chosen aperture. You can check it with the lens off-camera by playing with the aperture lever behind the lens and see if it moves really fast and if it comes back in place very quickly when you release it. This could explain the overexposure you would get when you close the aperture. You can also check in "A" mode by varying the aperture on the lens, the camera's shutter speed should adjust accordingly to what it expects the real aperture to be. If you see that the more you close down the aperture the more overexposed your shots are (for the same scene), then the aperture blades are sticking. Sometimes, I have the same feel of focus moving with my 35 Ais and you may be right that it could move. Or is it just the diaphragm closing making this weird vibration, I don't know for certain. But I try to hold the focus ring when I shoot this lens to prevent this "focus shift". Good luck. Here's a shot I did with the 105 on a Df, iso 3200. [url=https://flic.kr/p/x8k1gf][img]https://farm4.staticflickr.com/3816/20429983292_a8e6cea421_h.jpg[/img][/url][url=https://flic.kr/p/x8k1gf]MCC_9339.jpg[/url] by [url=https://www.flickr.com/photos/57847082@N05/]Marcel Carey[/url], sur Flickr [/QUOTE]
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Random blurry images with manual 105 f/2.5 Nikkor-P on D3300
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