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Jock

Member Since 16 Dec 2005
Offline Last Active Apr 16 2015 09:17 PM
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Posts I've Made

In Topic: Wide Angel on E-M1 in Nauticam Housing

13 April 2015 - 07:51 AM

... A talented photographer like Amanda can find a way to make things work to produce publishable images.

 

Phil, you are so right! Unless you buy some really cheap stuff you cannot go completely wrong with todays u/w-photo equipment. Sometimes I feel that people`s photos would benefit a lot more if the time spent on studying technical specs would be spent on studying composition, creative lightning and things like that. A dull picture with perfect, spot-on sharpness from corner to corner is still a dull picture... 

 

Rugani, what are you going to do with your pictures? Publish them in a coffeetable book or National Geographic? Print them regularly in a very large format? Or -to be honest- mostly look at them on your PC or Mac? Think about it...

 

Ah, and go for the 7-14mm lens. You will love it, it is just great.

 

Jock


In Topic: HOW TO FLOOD YOUR NEW D750

06 April 2015 - 09:04 AM

Ken,

What more to say than "Welcome to the Club..."

My first flood years ago - a Motormarine with a hair on the o-ring. In-field repair (flushing with freshwater) was possible and saved my PNG-trip. Second flood - Nikonos RS - no idea what happened. Third flood - Nikonos V with 15mm lens on a rough shore entry. Then for years I thought I was through and Neptune had got his share.

Last year another flood with a Nauticam housing and an OM-D EM5 - again on a very rough shore entry (somehow I managed to loosen the closing latch). Now I have a Leak Sentinel, which might have avoided this last flood. But I took it easy, better the camera floods than me!

Good luck,

Jock

In Topic: Second thoughts about vacuum systems

26 March 2015 - 10:22 PM

This one seems pretty obvious (to me...): Vacuum systems give you a pre-dive security check against user errors, i.e. twisted o-rings, a hair on an o-ring etc. In your case the shutter gland was loose. Would you have noticed without a vacuum system? No. Could you have noticed with the vacuum system? Yes - IF you had operated/knocked/twisted the shutter button while on land. Does anyone do that (operate all housing controls pre dive excessively)? No.

And IMHO the camera shop owner is completely wrong! It does not make any difference if you pull from inside the housing (= apply a vacuum) or push from outside (= apply water pressure). So the idea that the o-rings are "sucked in" is nonsense. And nonsense especially if you think about the relatively small degree of vacuum you apply with your pump.

Bottom line: If you want to avoid a flooding don't take your housing under water :-)

Just my two Euro-Cents
Jock

In Topic: Flash settings with Olympus E-M1

26 February 2015 - 08:37 AM

Hi Michael,

 

maybe you want to have a look here. I did some tests with the magnet in/out and TTL/manual:

http://wetpixel.com/...showtopic=51861

 

Generally I think it is not a good idea to mix different strobe brands and try to use TTL; even with two identical Inon Z240 TTL is not reliable - at least in my setup with an E-M5. Maybe the E-M1 is better in that respect? (I doubt...)

 

For wide angle TTL does not make sense, and for macro it is convenient (if it works!), but I shoot manual now. If exposure is a bit too bright or too dark, just use your RAW converter.

 

Jock

 

p.s. TTL="fill" in the camera and S-TTL on the strobe


In Topic: OM-D E-M5 II stabilization improvement significant?

21 February 2015 - 01:59 PM

There is a rule of thumbs for focal length and shutter time: If you shoot with 50mm, use 1/50sec or faster, if you shoot 140mm, use 1/140sec or faster etc. This is WITHOUT I.S. With stabilisation you can use longer shutter times.

You see, for wide angle like the Panasonic 7-14mm you can use relatively long shutter times and still get sharp pics. The advanced I.S. will be good if you shoot birds with a long lens like the Pana 100-300, but for u/w does not matter that much.

Jock