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Messages - CR Backup Admin

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676
Lenses / Re: EF-S L Lenses
« on: February 14, 2011, 07:13:42 PM »
Many people are already confused by the difference between EF-S and EF lenses
:D  With full names like EF 70-200 mm f/2.8 L IS II USM, EF 100-400 f/4.5-5.6 L IS USM, or EF 70-300 f/4.5-5.6 DO IS USM.....how could anything about a lens name be confusing?   

Maybe they should be something like "Tamron AF 70-300mm f/4-5.6 SP Di VC USD"  :)

677
Lenses / Re: Canon EF-S 18-55mm 1:3.5-5.6 IS II
« on: February 14, 2011, 07:04:48 PM »
Wow, another FAIL from Canon. If they wanted to launch a new EFS they should have replaced the 17 55. any lens with  variable aperture is a FAIL. And that includes the new L 70 300. Whatever happened to the good old days of the 70 200 series...Gone, lost in the wake of the credit crunch...  :'(

Not all users can afford expensive lenses, thats why every camera and every lens maker has variable aperture lenses. We are talking a kit lens for a $700 camera kit, and you think it should be a $1500 lens?

678
EOS Bodies / Re: T3 Sensor - question...
« on: February 14, 2011, 07:00:27 PM »
Resolution of a lens / sensor combination is going to always be much lower than a person would expect.  The system resolution is equal to the product of the MTF of the individual components.

If your lens has a mtf of .7 and your camera 0.7, the result is 0.49, much lower than either one.  The way to increase the system resolution is to increase the mtf of the components.

Increasing the megapixel count in a camera increases its mtf.  noise reduction, noise, and AA filters as well as other factors including the firmware also affect the mtf of the body.

This was exactly the same issue with film, each layer of the emulsion has a mtf and the total mtf of the film is the product of the three, then multiply that by lens mtf, and very quickly, the system mtf drops off sharply.

A printer or a computer monitor screen drops it a whole lot more.  Its a struggle to keep the resolution up.

679
Lenses / Re: EF-S L Lenses
« on: February 14, 2011, 12:56:22 PM »
Many people are already confused by the difference between EF-S and EF lenses, not to mention E lenses like the TS-E tilt and shift.

It would be better not to further confuse things by having a EF-s L lens.  Perhaps a different designator for luxury lenses might work.  I'm not going to suggest one.

680
Lenses / Re: Lens Price Increases Taking Affect
« on: February 14, 2011, 11:15:49 AM »
Prices go up amd up.  Own a L lens for 5 years, and as long as it is a popular one still inproduction, you can likely sell it for what you orginally paid. 

Its not free, but it is different from a body which will decline in price a large amount over five years.

681
Lenses / Re: Too Many Lens Rumours
« on: February 13, 2011, 10:43:05 PM »
Break down the Nikon lenses by type.  The Canon lens production quantities are only EF Autofocus lenses which are equivalent to Canon "G" lenses, while you are including every 35mm lens Nikon has ever made including those with manual focus only which are mostly incompatible with modern Nikon Cameras.

Well, those figures are OFFICIAL milestone numbers released by Nikon and Canon themselves. I cannot break down the fine details... you'll have to ask Nikon themselves. :)

The point is, comparing apples and oranges doesn't help.  Its like comparing company a which sold 50 million AA batteries while company b sold 50 million batteries total, the information is misleading.

682
Lenses / Re: Opinions on the EF 28-300L
« on: February 13, 2011, 12:23:47 PM »
Like you said, very big and heavy.  People usually are looking for something convenient to carry for travel.  It was said to be targeted at photo journalists, where they may need a long zoom or a wide angle very quickly.  It might also make them a target at protests, where one side or the other will think the press is against them.

It might also tell a thief that here is a person who has valuable equipment.

In some countries, they do not let you take professional cameras into events without a press permit, while they ignore consumer cameras.

So, I'd rather not walk around with one in Kuwait where photographing a person without permission can bring you a fine, or even looking like you might do something they don't like could bring down the law on you.

683
Lenses / Re: Too Many Lens Rumours
« on: February 13, 2011, 12:16:12 PM »
Yes, a favorite rumor subject for several years have been replacement of the 100-400mm L, the 400mm f/5.6L, and 24-70mm L.  Anyone who makes decisions based on rumors would have been waiting 5 years or more by now, and imagine if they has sold their old lens!

Just read the rumors and have fun, but don't take it too seriously. 

Nikon appears to let rumors be leaked, while Canon does not even lets many of its higher execitives know what is coming unless, of course, they need the information. 

Sigma announces products often a year or more in advance of availability, and sometimes we never see the product.  I'd prefer having a product announced only when its ready for delivery, or within 2 months max, but marketing types sometimes have a different philosophy.

684
Lenses / Re: Too Many Lens Rumours
« on: February 13, 2011, 11:50:29 AM »
Canon had a big lead on Nikon for lenses up until the last 24 months or so. Nikon really addressed their prime weaknesses. Canon has struck back with some innovative design like the 8-15 and 200-400 1.4x.

Canon needs an ultrawide zoom lens that rivals the 14-24 f/2.8. They also need a cheap, good, fast, USM prime lens in the standard range for APS-C shooters (like the Nikon 35 f/1.8 ). The rest... I don't care.

Regarding lens milestones:
Canon milestones: 30 million in Jan 2006, 40 million in Apr 2008, 50 million in Jan 2010, 60 million in Feb 2011

Nikon milestones: 30 million in Nov 2001, 40 million in July 2007, 50 million in Sep 2009. 55 million in Sep 2010

So, in the 2010 period, Canon sold ~ 10 million lenses while Nikon sold ~ 5 million.

Break down the Nikon lenses by type.  The Canon lens production quantities are only EF Autofocus lenses which are equivalent to Canon "G" lenses, while you are including every 35mm lens Nikon has ever made including those with manual focus only which are mostly incompatible with modern Nikon Cameras.

685
EOS Bodies / Re: T3 Sensor - question...
« on: February 13, 2011, 11:45:03 AM »

Digic's don't contain "software algorithms". That is in the firmware.  Ignoring for a minute that software doesn't live in hardware.  Amplification is not handled by the Digic either, it's handled by the onboard pixel level signal amps.  Digic are ARM core based (I believe) processors with SIMD functionality.  Digic's are just basic logic cores to control the machine coupled with some simd/matrix multiplication support circuitry.  I would *strongly* suggest you research what ASICs are, and the functionality they general contain before you make any more statements about what the Digic does or does not do.

Although Digic 4 is a processor system, and firmware is in a separate memory chip, the net result is more speed and the ability to process more complex algorithms, and thus improve images over Digic III.

Its just a matter of nitpicking the wording that is in Canon's white paper quoted below, a person does not need to be a engineer and research ASIC's and firmware to know that cameras with Digic 4 produce images with less noise.

From Canon.

DIGIC 4
The DIGIC 4 processor first appeared in the EOS 50D camera launched in Autumn 2008 and is also featured in the EOS 5D Mark II. Compared to DIGIC III and the previous incarnations of DIGIC, the DIGIC 4 offers several advancements.

A more powerful processor can carry out more processing in the same time and therefore perform more advanced processing functions. The DIGIC 4 is actually about 1.3 times faster at signal processing when compared to a DIGIC III and this has several effects. It produces lower image noise for smoother images at every ISO setting and it also allows the extreme expansion (ISO) settings of H1 (12,800) and H2 (25,600) on the EOS 5D Mark II.

The extra processing speed also helps if high ISO noise reduction is enabled. The cameras can retain their burst rate and shooting speed in all but the highest level of noise processing.

   Enlarge imageThe DIGIC 4 processor first appeared in the EOS 50D.

Much of the DIGIC 4 processing is similar to the DIGIC III but it has also added some new features such as Peripheral Illumination Correction to counter the possibility of corner shading, Face Detection AF in Live View mode, and UDMA class 6 card compatibility.

In the EOS 5D Mark II it has added the ability to shoot full HD 1080p movie with sound because the processor can deal with the data fast enough to process it out to the memory card without bottle necks.

Overall, DIGIC 4 means that the cameras capture images with visibly better image quality.

The EOS 7D and EOS-1D Mark IV both feature Dual DIGIC 4 processors. The benefits are the same as having a single processor in the EOS 5D Mark II, but with two processors the processing speed is faster – this allows these cameras to deal with high resolution images at 8fps and 10fps respectively.

The extra processing power has also allowed 50 and 60fps HD movie recording at 720p as well as higher ISO capabilities, with the EOS-1D Mark IV featuring ISO expansion up to ISO 102,400.

686
Canon EF Zoom Lenses / Re: Canon EF 100-400mm f/4.5-5.6 L IS USM
« on: February 11, 2011, 11:13:10 AM »
I'm hoping that winter is winding up, that pile of snow in my back yard is a small fraction of what was there.  Unfortunately, more snow if in the forecast.

It is nice to have a few days break and see a blue sky though. 

I usually use the 100-400L at short range, but I did not see anything better to photograph from my porch, and it was too cold to setup and wait for birds.  There was a flock of magpies around, but they are very shy, and do not sit still for more than 5 seconds.  They watch us in the house and leave if we head toward the door.

687
Site Information / Re: Non-responsive script
« on: February 11, 2011, 11:01:01 AM »
Firefox 3.6 on windows 7 64 bit.  Never a issue.  I turned off the default popup blocker and ads appeared instantly, its very fast.

688
Lenses / Re: 24 - 105 mm f/4 L IS II
« on: February 11, 2011, 10:41:24 AM »
The new 24-105 replacement was rumored last year as well.  Lens rumors are very difficult to get accurate information on.  It does not seem unreasonable that a new one could be coming with a wider focal range, but it will be much more expensive, so it won't pull down the value of my existing one that I paid $700 for new three or four years ago.  Back then the 5D kit with 24-105 cost a $600 premium over the base camera, and I bought the lens from a person who already had a 24-105 and just wanted to defray the cost of his 5D.

Mine has been a wonderful lens, on a crop camera, its a bit better than it is on my 5D.  I don't use it except as a outdoor walk around, and prefer to use primes if I can.  I even returned my new 70-200mm f/2.8L II because I found it easier to carry three primes with me.

If a new 24-105 replacement came out with a 5D MK III, I'd be tempted to buy the kit.

689
Software & Accessories / Re: canon replacing their scanners?
« on: February 11, 2011, 10:31:58 AM »
Is was announced last May, so its unlikely to be replaced soon.  Scanners do not sell very well, so there is no incentive to put out major new models.  I've had my Epson photo scanner for 3 years, and it really hasn't been improved upon by much.

When they come out with a USB3 scanner, it might be worth taking a look at.  Speed is the biggest thing if you are scanning hundreds of old negatives, and I have thousands left to do.  For slides though, the low cost photo scanners don't do well enough for me.

690
EOS Bodies / Re: T3 Sensor - question...
« on: February 11, 2011, 10:07:12 AM »
I'm not sure what this thread is predicated on.  where/why is the T3's MP count different from the 450D's?

T3 - 4272 x 2848
XSi - 4272 x 2848

yes they may have updated the manufacturing process (I don't know enough about it to know whether changing to gapless microlenses is a big deal), but I also don't know where the assumption that the sensor has changed is coming from.  given the fact that the max pixel counts are exactly identical, and that the T3 slots in even cheaper than the XSi, I am of the opinion that it's exactly the same sensor

The radically different high ISO performance for one.  Even with PC powered NR in post production the 450D isn't *close* to that good at high-iso.
[/quote]

Updating from Digic 3 to Digic 4 likely adds at least 3/4  stop.  Better noise reduction algorithms probably adds 1/2 stop, Changing to gapless micro lenses and updating the bayer filters, can add 1/2 stop, suddenly you get around  2 stops with the same basic sensor.  They can also make a lighter AA filter.  All this could make a big difference.

The simplest solution is usually the best one.

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