What you can do with a piece of 1/8 inch welders glass


ChrisA

Link Posted 01/08/2008 - 11:16
What you can do with a piece of 1/8 inch welders glass.



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Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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Last Edited by ChrisA on 01/08/2008 - 11:19

hefty1

Link Posted 01/08/2008 - 11:22
Nice one! Was this a recent eclipse?
Joining the Q

ChrisA

Link Posted 01/08/2008 - 11:23
hefty1 wrote:
Nice one! Was this a recent eclipse?

Just over an hour ago.
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Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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Clarky

Link Posted 01/08/2008 - 12:07
Well done, was it only a partial eclipse
Camera:|K-7|
Pentax Lenses:|DA12-24/f4 ED AL|DA35Ltd Macro|FA31Ltd|FA77Ltd|FA50/1.4|F70-210|FA20-35 f4/AL|A*200/f4 Macro ED|A50/1.7|A50 Macro f2.8|1.7xAF adapter|
Voigtlander|125/f2.5SL Macro APO Lanthar|
Sigma Lenses:|EX DG 100-300 f4|2X & 1.4X TC|
Flashes:|AF540FGZx2|RingFlash AF160FC|

ChrisA

Link Posted 01/08/2008 - 12:18
Clarky wrote:
Well done, was it only a partial eclipse

From the UK, yes.

I didn't get any more like this after I removed the UV filter that was sitting between the welders glass and the lens:




However, look closely at the ghost at top left. It was present on all the shots, even after removing the intervening filter.

Cranking up the brightness on one of the later ones shows it a bit more clearly:



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Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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Clarky

Link Posted 01/08/2008 - 12:25
What causes that ghosting and what time of day was it
Camera:|K-7|
Pentax Lenses:|DA12-24/f4 ED AL|DA35Ltd Macro|FA31Ltd|FA77Ltd|FA50/1.4|F70-210|FA20-35 f4/AL|A*200/f4 Macro ED|A50/1.7|A50 Macro f2.8|1.7xAF adapter|
Voigtlander|125/f2.5SL Macro APO Lanthar|
Sigma Lenses:|EX DG 100-300 f4|2X & 1.4X TC|
Flashes:|AF540FGZx2|RingFlash AF160FC|

ChrisA

Link Posted 01/08/2008 - 13:06
Clarky wrote:
What causes that ghosting and what time of day was it

10.15 am or thereabouts for the maximum.

I imagine the bright ghost to the left of the sun is a reflection off the filter, on to the welders glass nearest edge (and then into the lens).

The less bright one to the left of that I'd guess is a reflection off the welders glass furthest edge.

Not sure where the reversed one comes from though.
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Edit: 'face', not 'edge', of course.
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Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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Last Edited by ChrisA on 01/08/2008 - 13:09
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