iPhone Polariser

Handy little guide to building a polarizer for the iPhone



Aerial Photography – Fancy a go?

The guys over at Photoship can build you an electric helicopter system with autopilot and microwave download – yes you read that correctly – for about $18000.  Now that’s not that expensive when you consider what you are getting and it also represents the top end of their offerings with cut down versions much cheaper.


Cokin ND Filters – Not very Neutral – Colour Cast Problem

Recently I bought a starter set of graduated filters from Cokin in what they call they P series.

This consists of a holding mount to hold the filter plates, the filters themselves, and a adaptor ring – read more here

This weekend I went out to play with them and found that I was getting a horrible pink cast over my images when I was staking filters.

At first I thought it was the white balance but even the raw images have come out like this.  Now its possible to effectively remove the cast in Photoshop, but it is not the point.  I wanted to spend less time in front the computer and getting more shots correct ‘in camera’.

After a quick search on Google I found this article on Flickr – http://www.flickr.com/photos/brentbat/2372603825/

It effectively tells me that the Cokin ND filters are, to be blunt, cheap and if the effect they give is not what you want (you bought a neutral density filter you expect it to be neutral) pretty useless.

Take a look at the sample picture below take from the post on Flickr and see what I mean.

ND Filter comparison – Cokin vs Singh Ray

Now I know the pink does sort of look nice in the example, but its not neutral and it certainly wasn’t what I wanted.

After reading the responses on Flickr and a few other sites it would appear that this is a know issue with the Cokin ND range and seems to stem from the fact that they let in to much Infra-Red light.

Based on this alone I am now looking to upgrade my filters to either Singh Ray or more likely to Lee Filters (http://www.leefilters.com/camera/) which are excellent.  If it wasn’t for the cost I would have bought them in the first place, but as with all things in photography – it seems you only get what you pay for.

Canon 24-70mm f2.8 L USM – My First L Lense

Canon 24-70 f2.8 L USM

Canon 24-70 f2.8 L USM

So today I am very excited!!!  Today I picked up my first lens in the Canon professional range – a 24-70mm f2.8 L USM.

So for those who are not sure what all that means let break it down into sections…

Focal Length: 24-70mm
Aperture: 2.8 – constant across the focal range
L: means this lens is a member of the Canon Professional range (also denoted by the red ring around the end).
USM: Ultra Sonic Motor – for quick, silent, precise focusing

Description [taken from canon.co.uk]

“The EF 24-70mm f/2.8L USM is a high-performance lens. It has been developed as a successor to the EF 28-70mm f/2.8L USM, but with a wider zoom range to meet the needs of photographers using certain digital cameras.

The EF 28-70mm f/2.8L USM has proven very popular with professional and advanced amateur photographers since it was introduced in 1995. However, the increasing use of digital cameras, most having sensors smaller than a 35mm film frame, has increased the demand for a high-performance standard zoom lens with a wider wide-angle setting. The EF 24-70mm f/2.8L USM lens meets this need. The optical design is based on the previous lens, but incorporates new design features that allow the broader focal length range while maintaining the superb image quality. At the same time, the minimum focusing distance has been reduced from 0.5 metres to 0.38 metres.
Improved water and dust resistance ensure that it will become the leading standard zoom lens in the EOS system.”


I don’t know enough about lens construction and the how to test them to provide a good review, if you want that check out the-digital-picture.com.

From a personal point of a view the lens is very well constructed, its feels solid compared with my other lenses.  The picture quality is very sharp with colour contrast and saturation all looking very true to life.

The lens BIG and not just slightly either.  It dwarfs my 450D, but makes it look very cool as well – it now looks a little like a lens with a camera attached, rather than the other way round! 🙂

I am extremely happy with it, so less time blogging, more time shooting – check back soon for some test shots.