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adamhanlon

Member Since 09 Feb 2007
Offline Last Active Today, 04:54 AM
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Posts I've Made

In Topic: Post Edit Software Preferences

Today, 04:52 AM

I completely agree with Tim!

 

Adobe's Creative Cloud for Photographers plan offers both Lightroom and Photoshop at an attractive monthly rate. I would suggest that this is the best way forward for photographers now. You just have to get your head around "renting" software as opposed to owning it.

 

If you are looking for an app for photography, Lightroom is pretty much the way to go. If offers a more intuitive and streamlined workflow for image ingesting, processing, editing and exporting. Photoshop is an amazing graphics package that does an amazing number of things very well, but as a photographer, it has a huge number of functions atet you will need use.

 

The Elements packages are limiting, as their emphasis on "templates" doe not really suit underwater imaging.

 

There are a bunch of online resources for Lightroom and a number of excellent tutorial/seminar options for learning about it. 

 

Adam


In Topic: Performance of Sigma 12-24mm ART underwater?

16 January 2017 - 02:21 AM

I think that the issue is more that many very good land lenses do not work well behind dome ports. Having very wide apertures is not useful for most underwater applications as there is insufficient depth of field to keep the corners of the image sharp.

 

For example, the Nikon 16-35 f4 actually outperforms the 14-24 f2.8 behind  dome!

 

It is further confused by the various sensor sizes that are available. What works on a cropped sensor camera may not work on a full frame and voice versa.

 

Saying all that, I am sure someone will get the Sigma behind a dome port soon!

 

All the best

 

Adam


In Topic: Distance from dome port to lens? Can I get away with being 20mm out?

16 January 2017 - 02:06 AM

Hi Peter,

 

Dome port set up is actually specific to the actual lens, so there is no generic information that you can use too work this out. Manufacturers typically physically test lens/port/extension combinations in order to figure it out. Lens positioning with a  dome is critical however!

 

If it is not correctly positioned, your images will not be sharp.

 

I would watch this video:

 

https://player.vimeo.../video/32130591

 

It is a pretty good primer on dome port theory

 

Split shots with a rectilinear wide-angle are difficult :)

 

Sorry to not be able to provide answers!

 

Adam

 


In Topic: Quality of WA zoom lens for UW use

11 January 2017 - 11:37 AM

I think we also need to step into the "real" underwater world too.

 

Firstly, we shoot through water, which will inevitably effect image sharpness.

 

Secondly, the critical factor is actually how the lens will interact with a dome port. Some very good, sharp (and expensive) lenses perform worse than their cheaper brethren behind a dome port. Not relevant to this discussion specifically, but the Nikon 16-35mm f4 will significantly outperform the 14-24 f2.8 behind a dome for example. 

 

I would specifically ask people for examples of image taken with the lenses you have chosen and decide based on their results. When doing so, it is also important to find out how they have set up their port too.

 

All the best

 

Adam


In Topic: New lens - what would you choose?

30 December 2016 - 09:22 AM

Your other issue with the "one lens to rule them all" idea is that to get true wide angle, you will need to use a dome, whilst that same dome will prevent you getting close for shooting macro. 

 

When shooting wide angle, most people will use strobes to illuminate the foreground subject and then balance this with ambient light for the background. Tim's latter two lovely images are both examples of this.

 

Your images with the 50mm are interesting as it is not a lens choice that may people favour underwater. Would it be possible to see the images uncrossed? How is the CA behind the flat port? It is hard to tell on web resolution images.

 

Without wanting to sound patronising, as an experienced topside shooter, I would get hold of Alex Mustard's "Underwater Photography Masterclass". I think this will really help you understand how optics and lighting work "beneath the surface".

 

All the best

 

Adam