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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 18 May 2010 (Tuesday) 09:40
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Any Idea's?? - Snoot Black Spot (See Images)

 
Oxford_Matt
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May 18, 2010 09:40 |  #1

Hey Guys,

This is driving me crazy.

I am using a Bowens 500w Esprit with a S-Type fitting snoot.

However it keeps leaving a black dark spot in the middle.
I have removed the modelling lamp its the same. Also removed the grid and its still no joy.

Any Ideas?

See images below.

IMAGE NOT FOUND
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IMAGE NOT FOUND
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T

CANON 5D MKII / Canon 40D / 17-40mm F4L / 24-70mm F2.8L / 24-105mm F4L / 70-200 F2.8L IS / 50mm f1.2L USM / 580exII / 430ex II / Adobe LR4 / Adobe PS6.

  
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Oxford_Matt
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May 18, 2010 12:50 |  #2

Anyone had anything similar?


CANON 5D MKII / Canon 40D / 17-40mm F4L / 24-70mm F2.8L / 24-105mm F4L / 70-200 F2.8L IS / 50mm f1.2L USM / 580exII / 430ex II / Adobe LR4 / Adobe PS6.

  
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roman_t
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May 18, 2010 15:56 |  #3

obviously bad combination of main reflector and snoot's build :-(
i have no snoot, sorry
move snoot forward a bit?




  
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Oxford_Matt
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May 18, 2010 19:03 |  #4

roman_t wrote in post #10204540 (external link)
obviously bad combination of main reflector and snoot's build :-(
i have no snoot, sorry
move snoot forward a bit?

I think your right. I spoke with the Snoot supplier and they are sending me a replacement one out, slightly larger.

Fingers crossed!!


CANON 5D MKII / Canon 40D / 17-40mm F4L / 24-70mm F2.8L / 24-105mm F4L / 70-200 F2.8L IS / 50mm f1.2L USM / 580exII / 430ex II / Adobe LR4 / Adobe PS6.

  
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Oxford_Matt
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May 21, 2010 19:11 |  #5

Replacement arrived... Works a treat.

Thanks for your input everyone.

;)


CANON 5D MKII / Canon 40D / 17-40mm F4L / 24-70mm F2.8L / 24-105mm F4L / 70-200 F2.8L IS / 50mm f1.2L USM / 580exII / 430ex II / Adobe LR4 / Adobe PS6.

  
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roman_t
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May 28, 2010 05:16 |  #6

Oxford_Matt wrote in post #10223968 (external link)
Replacement arrived... Works a treat.

Thanks for your input everyone.

;)

dont you mind to show the pattern replaced one gives? thanks




  
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Whortleberry
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Jun 07, 2013 05:00 |  #7

3 YEARS from problem to solution? Either OP or WEX didn't place too high a priority then. That link doesn't work either. However, THIS (external link) one does. Not massively impressive either when a link**** to someone's own website doesn't work :twisted:

**** The post to which this refers has subsequently been removed. Embarrassment perhaps?


Phil ǁ Kershaw Soho Reflex: 4¼" Ross Xpres, 6½" Aldis, Super XX/ABC Pyro in 24 DDS, HP3/Meritol Metol in RFH, Johnson 'Scales' brand flash powder. Kodak Duo Six-20/Verichrome Pan. Other odd bits over the decades, simply to get the job done - not merely to polish and brag about cos I'm too mean to buy the polish!
FlickR (external link) ◄► "The Other Yongnuo User Guide v4.12" by Clive Bolton (external link) ◄► UK Railway Photographs 1906-79 (external link)

  
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smithphilip1
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Jun 07, 2013 06:47 as a reply to  @ Whortleberry's post |  #8

Snoot is too small for your flash head.




  
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MDJAK
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Jun 08, 2013 12:45 |  #9

smithphilip1 wrote in post #16008215 (external link)
Snoot is too small for your flash head.

flash is too big for snoot. :lol:




  
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Whortleberry
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Jun 09, 2013 06:41 |  #10

From the sample picture supplied, I would surmise that what is happening is:

  • The snoot is relatively long compared with the overall size vis-á-vis entry/exit diameters.
  • The small exit hole is working like the 'lens' on a pinhole camera. You have a slightly defocussed image of the grid projected onto the wall.
  • The black spot results from the above 'pinhole' effect showing the lack of effective light from the centre of the source. It all boils down to the exit hole being so small.
This is a theory, you can easily prove/disprove it by dropping the shutter speed down to a point where the modelling light actually is contributing to the exposure. If the black spot lightens or disappears then that is what is causing the problem - you're getting the effect of a projector instead of a snoot.

An alternative would be to remove the snoot, use black paper as a cylinder between Esprit and (hand-held in place) snoot. By extending the body (NOT the small end) of the snoot in this manner, you should be able to see if my conjecture above is proven.

Yes, the Bowens genuine snoot is silly money - it's a factor of low volume production - versus the one shown (generic Chinese - one size fits all but not very well??). But the Bowens does at least work as you hope. A snoot is nothing more than a frustum of a cone - the trick lies in balancing the length with the exit diameter. All the "maker's own" snoots on which I can find info have relatively larger exit holes than the one shown by OP. There might just be a sound reason behind this!

Phil ǁ Kershaw Soho Reflex: 4¼" Ross Xpres, 6½" Aldis, Super XX/ABC Pyro in 24 DDS, HP3/Meritol Metol in RFH, Johnson 'Scales' brand flash powder. Kodak Duo Six-20/Verichrome Pan. Other odd bits over the decades, simply to get the job done - not merely to polish and brag about cos I'm too mean to buy the polish!
FlickR (external link) ◄► "The Other Yongnuo User Guide v4.12" by Clive Bolton (external link) ◄► UK Railway Photographs 1906-79 (external link)

  
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Any Idea's?? - Snoot Black Spot (See Images)
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