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| Bracketing issue - Page 1 | |
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| Posted: Sat Mar 12th, 2016 07:23 |
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1st Post |
Eric
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I suppose it's only taken me 20 years to notice it and even then on the last commercial shoot. I had taken to bracketing exposures when shooting kitchens. The diverse lighting from atriums to large patio doors mixed with contrasts fittings mean I either had to hide strobes everywhere to light dark voids ....or bracket and overlay exposures to fill in the dark holes. So lately, being quicker at photoshop than setting up lighting, I have adopted the overlay approach. To do this, I needed and used a sturdy tripod, to ensure fidelity of positioning. But here's the rub, as they say.... Yesterday, I needed to clone out some spurious wall light cabling ( kitchen not quite finished) and had to zoom right into background detail to match up some awkward shadows. I then noticed that the detail at that level wasn't as sharp as I expected. Zoomed out the images look sharp and good....but down at 1000% blow up I wasn't so sure. When I compared the first set of bracketed images with the 'set up' images I was surprised to see that there was even more detail in the set up images. The answer must be mirror rattle? Yes I know about mirror lock...but it slows up multiple shooting situations. The initial single shot setup images were immaculate. The 3burst bracket shots were, albeit minimally, inferior. Despite being mounted (or maybe because!) on a heavy rigid tripod I suspect that mirror vibration was being amplified through the 3images burst. This is borne out by the first shot in the sequence being better than the other two....although exposure could account for some of this. Something I had never considered. Fortunately the visual difference isn't apparent till you zoom right into 'bottles on the far shelves' .....but an erudite lesson how it's easy to compromise your efforts.
____________________ Eric |
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| Posted: Sat Mar 12th, 2016 12:35 |
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2nd Post |
Robert
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What camera Eric? Were you using your Grip release tripod head?
____________________ Robert. |
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| Posted: Sat Mar 12th, 2016 15:13 |
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3rd Post |
Eric
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Robert wrote:What camera Eric? 750 Yes
____________________ Eric |
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| Posted: Sat Mar 12th, 2016 15:14 |
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4th Post |
jk
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Which camera were you using? D750 or D3?
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Sat Mar 12th, 2016 15:33 |
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5th Post |
Robert
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Eric wrote:Robert wrote: 24Mp, twice the D3 density. That, coupled with the mirror slap and your tall ball joint seem to me a recipe for shake. I am very suspicious of that ball joint, way too much leverage and distance from the tripod top to the lens, may be very convenient but in my view too flexi in critical circumstances. Easy to confirm, with and without the tripod head, with and without shutter delay. I usually use the self timer set to 5 seconds if I don't have a remote to hand.
____________________ Robert. |
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| Posted: Sat Mar 12th, 2016 15:40 |
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6th Post |
jk
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If D750 then I have to agree with Robert. The D3 is much more sturdy and absorbs the mirror slap much better. The D750 is lighter and has higher pixel density so almost begs for the problem of vibrations.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Sat Mar 12th, 2016 17:04 |
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7th Post |
Eric
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Robert wrote:Eric wrote:I think we are talking at cross purposes. It wasn't my portable tripod with the manfrotto latest pistol grip...which I think you have seen me use? it's my very big old studio tripod with the original grip. It's so firm and heavy I don't believe that was moving. I have trouble moving it myself! It could be the extra pixels and lighter body of the D750....but as I said the first shot in the 3sequence was ok...it seemed to be the cumulative effect of the next shots. I need to check the sequence ( eg under over normal) it's possible the under exposure was first .... which would be faster shutter and more saturated, giving extra detail. I stress the difference is very minor and I don't expect to be bracketing images on a tripod again. Lol
____________________ Eric |
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| Posted: Sun Mar 13th, 2016 02:43 |
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8th Post |
Robert
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Sorry, didn't realise you had two grip heads, although while it may be difficult to align on the subject, anything which raises the body above the tripod head will increase the leverage at the head and allow at least some deflection. There must be some deflection (wobble?) there, else there would be no blurred image? I hadn't realised the D750 was a small FX body, this is why I want a D3, I have to say I'm not very familiar with the latest Nikon bodies. I will embrace the weight and 'low' pixel count of the 'old' and heavy D3 body for the benefit of improved stability and lack of fussiness gained. I use a hydraulic video head on my heavy tripod, that is pretty well rock solid and any movement there is, is well damped. I would use a heavier, larger video head if I could find one I can afford. Final thought... Was your tripod stood on carpet? My heavy tripod has spiked feet, I always stamp the spikes well into the ground before taking photographs, carpet or a soft (wood) floor could well account for minor vibrational movement. No matter how solid the tripod, it needs a rock solid foundation, pun intended.
____________________ Robert. |
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| Posted: Sun Mar 13th, 2016 06:03 |
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9th Post |
jk
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Eric wrote: Robert wrote: What you dont use HDR. I thought would be your next project. 
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Sun Mar 13th, 2016 14:11 |
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10th Post |
Eric
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jk wrote:Eric wrote:Robert wrote: Most of my shots are garish enough, without adding HDR.
____________________ Eric |
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