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Topics - insanitybeard

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Just noticed whilst looking at Park Cameras and WEX that their prices on several Canon lenses (genuine UK stock) have dropped by a fair whack- EF-S 10-22 £499 (were about £620), EF 24 2.8 IS £499 (were about £590), EF 28 2.8 IS £459 (were about £560), EF 35 f2 IS £529 (were about £600), couple of these have been on my radar for a while waiting for the price to drop.... looking at the credit card deciding if I can justify it!

Lenses / Question about TDP's sample crops
« on: August 02, 2013, 10:02:48 AM »
Hopefully one of you jolly fine fellows can answer a question that has been bugging me for a while!?

When using The Digital Pictures' sample crops to compare lens performance against other lenses or the same lens used on a crop and full frame body, for example, it astounds me how soft the crop body rendition is in comparison. The below link illustrates my question:

The 70-200 2.8L IS II is obviously one of Canon's legendary lenses, but why does the crop crop (crop body crop!)- which is a 60D in this case- look so much softer than the full frame 1Ds III? Is it just that the 60D has a very soft output? I chose f5.6 as the aperture for both bodies so there should be no diffraction issues but the comparison is much the same at other apertures anyway. Even more surprising in the above comparison is how soft the corners are on the 60D crops compared to the 1Ds III, which surprises me because the crop body is not using the lens's full image circle. The first time I used TDP's comparison was with ultrawide zooms so I just figured that it was the fact that the full frame ultra wides were performing better than a crop equivalent (think EF-S 10-22 on crop compared against 17-40L on full frame, but when I started looking at other lenses I saw it was pretty much always the same- the FF crops were visibly sharper with the same lens. Any thoughts?

I'm a hobbyist photographer who mainly shoots landscapes, and have been using a 7D for the last 3 years. My ultrawide landscape lens is the Canon EF-S 10-22, which does yield good results, but coupled with the pixel dense 7D does struggle with fine detail towards the corners when the files are viewed near to 100%. Whilst I always expected that going full frame would give benefits especially regarding landscape photography, and is something I intend to do in the medium term when i can afford it, I was quite amazed at the difference in sharpness comparing the sample crops on The Digital Picture:
Looking at this comparison, with both lenses set to f8 and at their widest setting to provide a similar FOV in their respective formats, the EF-S 10-22 used on a 60D crop body @10mm appears very unsharp and with more visible CA than even the 17-40L ( itself not regarded as a stellar performer at the wide end on FF until considerably stopped down)  used on a 1Ds mk. III. Is this showing the limitations of ultrawide glass on pixel dense crop sensors or could it be partly down to a poor copy of the 10-22 being tested? This difference indicates that I would see a marked improvement in IQ by switching to a FF body, even using the 17-40, which I already own. Any thoughts/ input appreciated!

Canon General / New and improved Canon bodies in development?!
« on: November 20, 2012, 11:35:04 AM »
This may or may not have appeared on this site before (apologies if so)...... Are canon developing new large format bodies? This one looks like it may be pretty speedy as well.... Not sure if the new colour scheme will be a hit though.....  :o

With the EOS 7D, all 19 AF points are cross type, but the blurb states that:

 "for enhanced precision, the central AF point features extra sensitivity when used with lenses having a maximum aperture of f2.8 or faster" (taken from Canon's official EOS 7D brochure)

Does this mean the centre AF point is double cross type or have an additional horizontal / vertical line activated at f2.8? Or is it just a more sensitive standard cross type sensor? I can't find anything in Canon's literature or in the likes of dp review that clarifies it.


Software & Accessories / Canon car charger CBC-E6
« on: November 07, 2012, 11:30:06 AM »
Sorry to add another 'Canon's pricing sucks' thread, I know there have been a few recently regarding Canon's pricing of lenses in particular but....

I own a 7D which uses the LP-E6 battery (as do the 5D II and III models). Canon makes the CBC-E6 charger which you connect to the cigar lighter socket in a car which allows you to charge your batteries on the move. Great idea..... BUT, in the UK, it costs about £150. The standard mains powered LC-E6E charger costs about £45 - 1/3 the cost! Obviously they make loads more of the mains powered chargers to be bundled with the bodies so production costs are lower but what a difference in price! It's far cheaper just to buy an inverter to convert the 12v output from the cigar lighter socket up to the 240v UK mains voltage and then use the mains charger to convert it back down again! Now I know production costs have little to do with retail price and Canon maximises their profit on these kind of accessories but I can't believe they sell many at that price! Might as well buy 2 spare batteries for the same money and charge them up before leaving home!  :P

Lenses / The number of electrical contacts on the mount of an EF lens
« on: August 17, 2012, 07:24:24 AM »
Hello all,
             Sorry if this topic has been covered before but just curiosity on my part. Was having a look at the rear mounts of some of my lenses and noticed some have different numbers of electrical contacts on them. My three non-IS lenses have 7 contacts in total, one group of 5 and one group of two which is slightly more recessed into the mount (and of these one of the two contacts is considerably wider than the other). However, my 70-200 F4 IS has 10 contacts, one group of 8 and the other 2 recessed further same as above. Now initially I assumed that the extra contacts were to do with the IS mechanism but having looked at the corresponding contact pins on my 7D body I see that there are no pins on the body to make contact with the additional 3 pins of the lens (ie, the body only has a total of 8 pins and two of those pins contact the single wider contact on the lens)- therefore it cannot be to do with the IS mechanism and the crop sensor body does not support whatever function the extra contacts are for... Do the full frame bodies have more contact pins and if so what additional functions are they for? 

 Hopefully I have explained myself well enough!
  Thanks for your input!  :)

Third Party Manufacturers / What happenned to CCE camera bags?
« on: August 01, 2012, 07:48:36 AM »
Hello all,
            Bit of a random question but a number of years ago now I recall there being a company called CCE (Stood for Camere Care Equipment possibly) that made camera bags and cases etc, I can find no mention of them on the net so obviously they went bust or became something else but does anybody recall what happenned to them and when?

       Many thanks!  :) 

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