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Go Back   World Photography Forum > Photography Technique > Flash Photography Technique


Flash & metalic objects

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  #21  
Old 14-04-07, 22:35
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Don Hoey Don Hoey is offline  
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Al,

D50 flash sync speed is MAX 1/500 sec. Any value at or below that can be set but not higher. Currently on full bore your flash duration is 1/1100 sec. I hope the attached graphic explains the logic of sync speed. On any flashgun as the power is turned down the flash duration is shortened. I will read up on the SB24's SB25's & SB26's to see what you will gain.

Don
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File Type: jpg Focal plane shutter.JPG (81.4 KB, 10 views)
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  #22  
Old 15-04-07, 17:46
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Quote:
Originally Posted by Al Tee View Post
...That gets me further away from the subject as I've got my eye on some second hand SB24's SB25's & SB26's
Al.
Al,

In anticipation I have downloaded the manuals for SB25 and SB26. Historically the range is SB24 - 1988, SB25 replaced the 24 in 1992 and the SB26 replaced the 25 in 1994.
Benefits over the SB22 are higher guide number of 36 ( more power ) , swivel & tilt flash head and variable power output in manual mode. Big bonus is that all three will take the Stofen Diffuser code OM-C 15:95 at Warehouse Express. This diffuser is the business and needs to be included in the budget.

From a look at these specs it seems I may have been a bit optimisic as to flash duration of the SB22 in MD mode.

Here are the flash duration numbers for SB25 & SB26
1/1,000 sec at full output
1/1,100 sec at 1/2 output
1/2,500 sec at 1/4 output
1/5,000 sec at 1/8 output
1/8,700 sec at 1/16 output
1/12,000 sec at 1/32 output
1/23,000 sec at 1/64 output

Don
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  #23  
Old 15-04-07, 21:39
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Well..slight improvement tonight.."maybe"? With reduced power on the MD setting I was at F8, now looking at them I dont think I've achieved the DOF required..I've noted the "wear white gloves" advice too for next time!..anyway; got to go..the daughters mirror needs putting back on her wall!
Al
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File Type: jpg pistonglassblack2JS.jpg (234.1 KB, 11 views)
File Type: jpg pistonglassbleck3JS.jpg (257.5 KB, 8 views)
File Type: jpg pistonglassblackJS.jpg (245.3 KB, 13 views)
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  #24  
Old 15-04-07, 22:49
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WOW Al,

Now you ARE cooking. I just compared image 3 ( could actually have been 1 or 2 ) with that in your first post. Incredible difference never mind " slight improvement ".

Well done definately in order.

Don
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  #25  
Old 16-04-07, 22:56
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Had to have a go at something else in our range..I think I now need a better sample of said piston, anyway, I needed a rest from it!.. This is not as reflective at all as the piston but the techniques, hints & advice from you all helped me produce the attached..
Al.
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  #26  
Old 17-04-07, 10:29
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Al,

Very good control of the light, as all the important detail is visible. The central portion is also good as it looks to be quite a glossy surface.

Don
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