March 03, 2015, 06:36:58 AM

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Topics - Sporgon

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EOS Bodies - For Stills / 5Ds : dawn of a new era for primes ?
« on: February 14, 2015, 06:57:10 AM »
My photographic career goes back well into the days of 35mm film, and with that medium cropping was generally very undesirable. You will occasionally find people on internet forums who claim that their 35mm film is about 20 mp because it scans at around 20 meg of information, but much of that information is grain. In real terms of resolution, at least in terms of visual enlargement, 35mm film is about equal to 8 - 10 mp, depending on which emulsions were used.

When I first started with FF digital in 2005, I quickly found that framing on a 12.7 mp 5D was much more forgiving than I had experienced before, and then when adding the 21 mp 5DII there was quite a jump in how much I could crop without any real enlargement issues.

Over the last twenty years or so there has been major development and improvement in zoom lenses, until recently very much at the expense of fixed focal length lens development. However one area where zoom lenses have not been able to make much progress is in size and weight ( though weight has been improved a little), aperture speed and price. Indeed if anything price is going up ! I often hear about people who are changing their Canon / Nikon system for something smaller and lighter. Indeed I was one of them a few years back. Without exception these people all were toting the finest f/2.8 zooms, often adding in a 100-400L as well.

When it comes to mp I am one of those people who think that, in a small, portable camera, 18 mp or so is quite enough. In fact when stitching the panoramics I would be quite happy to have 12. With good lenses and excellent technique 18 to 20 mp offers ridiculous levels of detail, in picture sizes that are generally much larger than most people want. At Building Panoramics I am constantly being asked for pictures that are smaller than my standard size. Originally I found this insulting; now I just find it annoying.

My initial reaction to the 50 mp 5Ds is that I don't need or want that amount of pixels. ( I'm not mentioning the 'r'. I'm one of those people that known that once you have run a light USM there is no practically perceptual difference in detail).

But then I got think about my circumstances with primes. I generally prefer a few light, fast primes to a heavier, slower zoom. If a 21 mp camera allows more practical cropping then a 50 mp one is even better, assuming you are making the pixels count. Primes offer lighter, faster, sharper in frame edges, less distortion, shallower entry pupil ( for stitching), better balance on a smaller camera. I wont say cheaper because by the time you have a few of them to equal a zoom they are as expensive, if not more so. Certainly the extra mp will allow more 'focal length flexibility with fixed focal length lenses.

Also interesting that the 5Ds is a little lighter than the 5DIII. I'm guessing that it probably lacks the stainless steel bottom plate of the 5DIII. But lighter is better for lugging around the country side.

Maybe we will see more development in primes now. Thoughts ?

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EOS Bodies - For Stills / Says it all
« on: January 21, 2015, 09:40:37 AM »
From my local professional dealership.

Both described as "mint -", which means basically brand new.

Shows how much the Market cares about another stop or so of DR. Says it all really. Personally I'd be annoyed if my chosen brand of asset was depreciating so much faster than its other equal.

Incidentally it is very rare for them to get a used 5DIII in. This is only the second I have ever seen them get.

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Portrait / New Arrival
« on: January 04, 2015, 12:57:56 PM »
New arrival shot on 5DII & EF 50 / 1.4. ISO either 100 or 160

First at f2, second at f4, third at f2. More or less straight off the camera, medium jpeg. After a touch of unsharp mask I still find the 50/1.4 as good as anything for this type of stuff.

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Street & City / Brugge - Belgium
« on: August 12, 2014, 03:03:10 PM »
Been over to Belgium to photograph the first world war cemeteries in conjunction with the 100th year anniversary of it's beginning. Quite, quite unbelievable, the loss of life defies belief.

Here's a shot of Brugge or Bruges in West Flanders, an area that saw some of the heaviest casualties in WW1.

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Canon EF Prime Lenses / Canon EF 28mm f1.8 USM
« on: April 25, 2014, 12:47:18 PM »
I see no one on CR has been brave enough to admit to owning the 28/1.8 let alone posting any shots with it.

A much maligned and misunderstood lens, it's reputation in tatters from the on line review specialists.

Actually it's damn sharp in the broad centre from 2.8 onwards and then gets quite sharp again at the very edges having had a dog's breakfast somewhere in between. Can't match the excellent 28/2.8 IS towards the edge of frame but then it doesn't vignette at f2.8.

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EOS Bodies - For Stills / Thought on a full screen histogram option
« on: September 18, 2013, 11:00:01 AM »
My main use of the rear LCD display is to view the exposure via the histogram. As many have found, judging the exposure from the picture can be very misleading, but 'blinkies' can be helpful. However the histogram is always very small, and subtleties regarding small amounts of data at either extreme end can be inconvenient if not nigh on impossible to see.

I'd like an option on the higher end camera where you can select the whole, or virtually the whole of the rear LCD to display a large histogram - so I can see it properly. With this enabled you could then toggle to the picture via the 'info' button or what ever. The extremes of the histogram could blink if the data is beyond the sensor.

This would be very useful to me. Anyone have thoughts on this facility ?

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Site Information / The 10 Commandments of CR
« on: August 03, 2013, 05:14:11 PM »
Here's a light hearted topic for the weekend.

It's a great community on CR  - generally. The only forum I bother with, and I think it is the same for plenty of others.
But there are some real pet topics, so here's a tongue-in-cheek, spoof 10 Commandments adhered to by the CR community.

I've got two, others can finish it. The more amusing the better.

1. Thou shalt purchase a 135L and pay homage to it daily.

2. Thou shalt only ever shoot in full RAW ( even for facebook ) .........................


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Being blokes, and we don't do manuals, can someone tell us how to configure the 6D to enable direct focus point control similar to Custom Function C.FnIII / 3 on the 5D mark ii ?

We have found the C Fn to enable direct AF selection with the 8 way controller, but there then seems to be no way of quickly returning to the centre point only as there is on the mkii by pushing the toggle in. I had assumed that the obvious button would be to press the 'set' button, but this seems to be disabled when having direct control of the 8 way controller.

On the C Fn menu for the 'set' button it doesn't list anything to do with AF.

Confused  :-[

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Lenses / Conflicting results between The-Digital-Picture & Photozone
« on: April 08, 2013, 09:53:49 AM »
Is anyone else confused by the apparent differences in resolution tests performed by The Digital Picture and Photozone ?

On TDP's ISO 12233 charts they can show very different results to photozone's MTF graphs.

For example take the 70-300L and 70-200 f4 IS results; two lenses which people looking for a tele zoom are very likely to be having to decide between. Using 70mm as an example, on TDP's 12233 charts the 70-200 is clearly ( pun intended ) way ahead of the 70-300L, I mean it is like night and day, whereas on Photozone's graphs the 70-300L is clearly showing better results.

Another example is the resolution of the 24-105L. TDP clearly shows this lens to be at its over-the-frame best at 70mm / f8, whereas photozone's results do not confirm this - at all. They show it to be better in the 35-50 region.

In 'field' applications my experiences would suggest photozone is giving a truer picture.

Could these differences be the result of copy variances ? if so it is very disturbing for someone wanting to purchase a high quality lens.


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Lenses / Variable length zooms and dust
« on: December 22, 2012, 01:21:50 PM »
I have a question regarding zoom lenses that change their physical length, such as 24-105L,  70-300L etc, and the potential for them to ingest dust, pollen etc into both the camera body and themselves by sucking and blowing air in and out.

Is this a fact ?

If this is the case I am puzzled as to why when fitting a weather sealed zoom of this type onto a weather sealed body you don't have problems in zooming the lens outwards against a vacuum that would be created in the body.
Now I know that weather sealed doesn't mean airtight, but even so I would expect resistance when trying to zoom in or out quickly as the air tries to pass the weather sealing gaskets.

Can anyone explain

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Technical Support / Mirror fallen out of 5D - self repair ?
« on: December 14, 2012, 07:58:59 AM »
Our Building Panoramics 5d MK1's mirror has finally fallen off its perch after seven years.

I know this is a design fault and Canon modify the mirror free of charge, but has anyone tried to glue the mirror back themselves ? It seems like a very light dot of super glue on the four little cushions / adhering points would fix it.

I'd appreciate experience from anyone who's fixed this themselves.

Thanks,

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