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Dark band in photos


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#1 KatheK

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Posted 18 September 2011 - 09:21 AM

I am new to underwater photography. I have a SeaLife dC1200 camera with a wide angle lens and a strobe. I have only made one dive and took dozens of photos. As one would expect, most of the photos were throwaways with a couple of nice shots that were purely accidental I'm sure. Even the good shots have a dark band of color across them.

I also bought The Underwater Photographer by Martin Edge. in his book he says, "Make sure the water drains from the lens and housing port first or you will have a dark line across the photo." Obviously, that is exactly what happened, but I don't understand what it means.

I attached the wide angle lens before I got in the water but I could have done it while in the water. How on earth does one get something to drain when one is underwater? I must be missing something...can anyone help?
Kathe
Quintana Roo, Mexico

#2 Steve Williams

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Posted 18 September 2011 - 12:47 PM

Kathe, can you post one of the shots or give us a link so we can see what you're describing?

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#3 KatheK

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Posted 18 September 2011 - 05:00 PM

Here is a link to two photos...the first one was taken within 2 or 3 minutes of getting to the bottom and is one of the few decent photos and the other was taken later. I could not figure out how to put the photos into this discussion. Thank you for offering to help.

Picasa Album
Kathe
Quintana Roo, Mexico

#4 rtrski

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Posted 18 September 2011 - 06:38 PM

Is that a 'wet lens'? e.g. it's a Wide angle that doesn't form part of the sealed housing, but is added externally (and can be added when in the water)? If so, it kind of looks like it was partially filled with water and partially with air in the second photo, hence you have the line between the two with a different focal length on one and the other side of the border.

With wet lenses I thought you wanted the 'interface' between them and the actual housing port face *completely* flooded with water. The lens structure may have a sealed air cavity, but the gap between add-on lens and housing port face needs to be consistent. Maybe that's what Martin meant, and it's just a matter of context (he meant make sure the *air* drains from between the two??) It'll probably work if there's still all air inside the gap, you just don't get quite the same field of view, but it definitely can't work with a 'mix' of air and water.

I confess I have the book (on Kindle) and haven't hardly read it yet. :/

Current rig: Sony SLT-alpha55 in Ikelite housing, Sigma 105mm f2.8 DC Macro w/ Ike 5505.58 flat port or Sigma 8-16mm f/4.5-5.6 DC HSM behind UWCamStuff custom 5" mini-dome. Dual INON z240 Type IVs triggered with DS51 for TTL mimicry, or DS51 alone with home-made ringflash assy for macro.

 

Topside, unhoused: Sony SLT-alpha99, Sigma 150-500mm + 1.4TC (Saving for Sony 70-400 G2), Sigma 15mm diagonal fish, Sony 24-70mm f2.8 CZ, Tamron 180mm f2.8 Macro...all the gear and nary a clue...


#5 KatheK

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Posted 19 September 2011 - 04:05 AM

Is that a 'wet lens'? e.g. it's a Wide angle that doesn't form part of the sealed housing, but is added externally (and can be added when in the water)? If so, it kind of looks like it was partially filled with water and partially with air in the second photo, hence you have the line between the two with a different focal length on one and the other side of the border.

With wet lenses I thought you wanted the 'interface' between them and the actual housing port face *completely* flooded with water. The lens structure may have a sealed air cavity, but the gap between add-on lens and housing port face needs to be consistent. Maybe that's what Martin meant, and it's just a matter of context (he meant make sure the *air* drains from between the two??) It'll probably work if there's still all air inside the gap, you just don't get quite the same field of view, but it definitely can't work with a 'mix' of air and water.

I confess I have the book (on Kindle) and haven't hardly read it yet. :/


Yes, it is a wet lens and I had also just about decided that the word 'air' should be substituted for 'water'. It would not surprise me if that were true as my Kindle version of the book is loaded with typos and misspellings.

The next time I dive I will make sure to put the lens on under the water after getting rid of all the air bubbles. Thank you for your help.
Kathe
Quintana Roo, Mexico

#6 Aquapaul

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Posted 19 September 2011 - 05:07 AM

Yes, my first images I took with my wet close up lens looked just the same as yours. I had forgot to Burp the air out of the lens on several occasions. Very frustrating.
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#7 rtrski

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Posted 19 September 2011 - 05:18 AM

Yes, it is a wet lens and I had also just about decided that the word 'air' should be substituted for 'water'. It would not surprise me if that were true as my Kindle version of the book is loaded with typos and misspellings.

Sorry to hear that! Was planning on using it to pass the plane time on my next dive trip (Jan) if I didn't go thru it sooner.

I've noticed a lot of the Kindle books have formatting errors; seem to be using OCR instead of some sort of file translation from a digital manuscript original. Oh well, as e-books get more common hopefully they'll gradually prune them. One good thing is that as they update they will re-sync to your device. Had that happen on a couple purchases already. (of course that's a good thing if they're being *fixed* and not somehow "edited"...slippery slope when the copy isn't 'hard' anymore)

Glad to see some further confirmation from Aquapaul that you're on the right track! Welcome to the madness! :D

Current rig: Sony SLT-alpha55 in Ikelite housing, Sigma 105mm f2.8 DC Macro w/ Ike 5505.58 flat port or Sigma 8-16mm f/4.5-5.6 DC HSM behind UWCamStuff custom 5" mini-dome. Dual INON z240 Type IVs triggered with DS51 for TTL mimicry, or DS51 alone with home-made ringflash assy for macro.

 

Topside, unhoused: Sony SLT-alpha99, Sigma 150-500mm + 1.4TC (Saving for Sony 70-400 G2), Sigma 15mm diagonal fish, Sony 24-70mm f2.8 CZ, Tamron 180mm f2.8 Macro...all the gear and nary a clue...


#8 KatheK

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Posted 19 September 2011 - 03:40 PM

Thanks for the welcome...lots of reading to do...and I am looking forward to taking a class at some point if I can find a good one. I live near Cozumel and Cancun so it shouldn't be too hard.
Kathe
Quintana Roo, Mexico

#9 acuevas

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Posted 20 September 2011 - 05:01 AM

I have a wet lens with my old P&S camera.
If you look at your lens, you will see that it has holes to let the water in, be sure that the holes are not obstructed in some way.

If the wet lens is working correctly, you shouldn't need to do anything special in order to get the air out while you are underwater.
It could be a manufacture problem.
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#10 KatheK

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Posted 20 September 2011 - 05:29 AM

I have a wet lens with my old P&S camera.
If you look at your lens, you will see that it has holes to let the water in, be sure that the holes are not obstructed in some way.

If the wet lens is working correctly, you shouldn't need to do anything special in order to get the air out while you are underwater.
It could be a manufacture problem.


Acuevas, thanks for the suggestion. I will check it out.
Kathe
Quintana Roo, Mexico