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Messages - AJ

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361
Lenses / Re: Using EF-S lens on FF body???
« on: July 25, 2011, 11:42:14 AM »
What's the attraction of using EF-S lenses on FF bodies ?

There is no focal length gain

I think the point is being able to shoot short focal lengths, dual use of gear for those who have both FX and DX gear, and also just messing around for fun.

I've mounted my Tokina 10-17 fisheye on my A2E body and looked through the viewfinder.  If I zoom just right I can get 180 deg diagonal coverage, i.e. no real need for me to buy a FF fisheye.  Now, my A2E doesn't have 100% viewfinder coverage so I will need to extrapolate a bit to get the exact corner-to-corner coverage.  At 10 mm I can get close to circular fisheye coverage (top and bottom are cropped a little).

I should divulge that I haven't run any film through my camera with this lens mounted.

362
Lenses / Re: Quick question RE: 28-135mm f/3.5-5.6
« on: July 17, 2011, 01:44:27 PM »
It's called zoom creep.  Some lenses are prone to it.  Annoying when you have the camera around your neck.

Some lenses come with a zoom lock attached so that this doesn't happen, but the zoom lock typically only works at the shortest focal length.

If you're taking a shot at a high angle - e.g. time exposure of stars, shooting macro downward on a tripod, etc. - you can tape the zoom in place with a piece of gaffer tape.

363
EOS Bodies / Re: Biased Reviewing & the consequences.
« on: July 15, 2011, 02:08:02 PM »
The D7000 is arguably the best crop camera on the market today, sensor wise.  It should be receiving glowing reviews.  It's an awesome camera.  I wonder what those folks who were disappointed with this camera were expecting.

364
Lenses / Re: Lens recommendations for t2i crop sensor
« on: July 12, 2011, 12:44:40 PM »
I've had focus issues with my 17-55/2.8 IS as well.  On my 7D it required a large amount of adjustment (+18).  Strangely, on my 400D this lens focuses perfectly.

Koolman: one more budget-friendly option is Tamron 17-50/2.8 non-VR.  It's about 400 bucks.  I own this lens and I like it a lot.  It's easily my most used lens.  Deadly sharp.  But there's no stabilization of course.  The lens works great for indoor shooting with or without flash.On a drebel the Tamron is better weighted, while on a 7D the heavier Canon 17-55/2.8 IS is more balanced.

I also hear good things about Sigma 17-50/2.8 OS.  It's a little cheaper than the Canon.  I haven't used this lens myself.

Another option is a fast prime like Sigma 30/1.4.  I own this lens too.  It's got superb bokeh, easily matching or surpassing lenses like Canon 85/1.8 or Tamron 90/2.8 macro.  It's sharp in the center but the borders are weak, even when stopped down, so really it's useful for selective-focus shots only.  Somehow I don't end up using this lens very much.  I suppose it all boils down to personal shooting style.

365
Lenses / Re: New lens or body?
« on: July 06, 2011, 07:45:46 PM »
Time to upgrade from the kit lens.  Your camera body is just fine.

Mt. Spokane's suggestions of 17-55/2.8 IS or 15-85/3.5-5.6 IS are good ones.  I have the 17-55 and it's a very good lens.

If you're into landscape, maybe start thinking about an ultrawide.  Canon 10-22, Tokina 11-16/2.8, Sigma 8-16, or similar.  I have a Sigma 10-20 that I'm very happy with.

As for the long end, things can get pretty expensive pretty quickly.  You have 70-300.  Your idea of 70-200/2.8 with extenders is not bad, but a lot of folks gravitate to 100-400/4.5-5.6 L IS.  It's a very convenient lens and it delivers in the quality dept.  I have a 200/2.8 and extenders, but I don't recommend this setup to others - no zoom, no IS.

I'd skip the 24-70/2.8 L.  This lens is only really worth it for full-frame shooting IMO.

I've been shooting for about 4 years ...  I like doing it a lot so that's all that really matters.
Yes indeed that's all that matters!

366
EOS Bodies / Re: Which Canon 60D Kit Lens? (Plus 550D)
« on: July 06, 2011, 02:39:24 PM »
Hunt around a little and you may find a 60D + 15-85 kit combo.

Here's one in my city, Calgary Canada.  I know it doesn't help you being over in the UK, but you may find something locally.
https://www.thecamerastore.com/products/kits/canon/canon-eos-60d-15-85mm-f35-56-usm

367
EOS Bodies / Re: End of the APS-H sized CMOS?
« on: June 29, 2011, 03:12:16 PM »
What if:

Canon were to start making FF sensors with two pixel densities: one very dense (perhaps 32 or 36 mpix) for those 3-4 fps 5D and 1Ds series cameras, and a lower density (maybe 24 or 18) mpix sensor for a 1D series camera.

The lower pixel density FF sensor would give unprecedented high-iso performance and allow huge fps.  It'd be great for sports, journalism, things like that.  It'd be great for video too!

Question then is of cost.  Right now APS-H sensors are only put into 1D cameras.  Would it be cheaper for Canon to produce two formats only?  Would a low-density FF sensor cost significantly more than a APS-H sensor with similar pixel count?

Cost of a sensor is relative to the size, pixel count is not important.  Canon has a good white paper explaining this. 

http://www.scribd.com/doc/38542576/Canon-Cmos-Wp

Production costs for a full-frame sensor can exceed twenty times the costs for an APS-C sensor. Only 20 full-frame sensors will fit on an 8-inch (200 mm) silicon wafer, and yield is comparatively low because the sensor's large area makes it very vulnerable to contaminants—20 evenly distributed defects could theoretically ruin an entire wafer. Additionally, the full-frame sensor requires three separate exposures during the photolithography stage, tripling the number of masks and exposure processes.[


True.  But there has to be some savings in mass production?


Right now they can make a 5D2 for less than a 1D4.  Yes I know there's a huge difference in build.  But it goes to show that sensors aren't the only thing determining camera cost.


Another thought: Maybe Canon can't beat Nikon in the high-iso department unless they increase the size of the sensor?

368
EOS Bodies / Re: End of the APS-H sized CMOS?
« on: June 29, 2011, 12:29:11 PM »
What if:

Canon were to start making FF sensors with two pixel densities: one very dense (perhaps 32 or 36 mpix) for those 3-4 fps 5D and 1Ds series cameras, and a lower density (maybe 24 or 18) mpix sensor for a 1D series camera.

The lower pixel density FF sensor would give unprecedented high-iso performance and allow huge fps.  It'd be great for sports, journalism, things like that.  It'd be great for video too!

Question then is of cost.  Right now APS-H sensors are only put into 1D cameras.  Would it be cheaper for Canon to produce two formats only?  Would a low-density FF sensor cost significantly more than a APS-H sensor with similar pixel count?

369
I have a Tokina 50-135/2.8.  Optically it's the perfect portrait lens.  It's fairly big and heavy - perhaps slightly heavier than Canon 70-200/4L (both have a 67 mm front element) but way smaller than a 70-200/2.8

Problem with the Tokina is that AF is slow and hunts.  Also there's no IS.  It Canon came out with a ring-USM version plus IS, I bet it'd be popular.  I paid 500 bucks for my Tokina, but a Canon lens with ring-USM and IS would probably retail closer to a grand, I speculate.  Note, the Tokina has been discontinued.  Sigma has a 50-150/2.8.  Going out to 150 mm makes it bigger and heavier.

Sigma also has a 150-300/2.8 OS.  It looks great.  If this is the type of lens you want and you have the dough, then I say go for it:
http://www.photozone.de/canon_eos_ff/629-sigma120300f28oseos


370
Lenses / Re: EF 20 mm f.2,8
« on: June 19, 2011, 03:10:28 PM »
I used to own this lens.  At the time I chose it over the 17-40/4 because I thought I was smart to get an extra stop of light and spend less money.  In hindsight it was a bad decision, I should've gotten the 17-40/4.

It's a mediocre lens.  Color and microcontrast are great.  It's exceedingly sharp in the center from f/4 onwards.  c/a is low.  Has ring-USM focus.  Bomber build quality.  BUT: the corners take a while to sharpen up (f/8) and even then they're not impressive.  Vignetting is high even at f/11.  It's the worst flaring lens I've ever owned (major weakness for an ultrawide).  Bokeh is downright ugly (no big deal).

As mentioned, don't bother with this lens if you're shooting crop.  The cheaper Tamron 17-50/2.8 blows it away in terms of sharpness, plus it zooms.  20/2.8 was way more fun with film.  Even then I should've gotten the 17-40 because 17 mm is more fun than 20 mm.

Maybe they'll update the 17-40/4 someday?  Hopefully not, because that'll probably entail a price increase.

371
Lenses / Re: Canon Announces EF-S 55-250 f/4-5.6 IS II
« on: June 14, 2011, 12:58:56 PM »
Post here from someone who actually owns a 55-250 and shoots a lot with it.

It's one of the great bargains in the Canon lineup.  250 mm, 300 grams, 300 bucks.  Great lens for travel and hiking, stuff where every gram counts.

AF is buzzy but fast and accurate in strong light.  On a 7D in servo mode I had no trouble at all keeping up with fast skiing action.  But indoors or if the light is flat, forget it.  This is a function of aperture, not the type of focus motor.

Sharpness is impressive given the price of the lens.  It's the only consumer telephoto lens I haven't been disgusted with.  And trust me I've tried quite a few over the years.  It's not quite as good as my 200/2.8 L, but it's close.  Even wide open the shots can be printed quite large, and withstand strong cropping.

Bokeh is not bad at 250 mm f/5.6.  Circular and nice distribution of light.  55 mm is not bad either, but the intermediate focal lengths give doughnut shapes.  Once you know this limitation you can work around it.  This isn't a primo portrait lens, but it isn't meant to be either.

Build quality is cheap.  But it's adequate.  The plastic mount only has to support 300 grams.  If you put it in a padded bag it'll survive months of backpacking, no problem.  I do a lot of backcountry skiing and I find plastics easier to deal with in extreme cold.  FWIW on one day at -30C/-20F plus snow my Tamron 17-50 autofocus motor seized (lens shot fine in MF, motor unseized once warmed up) but the 55-250 kept on ticking.

Looks like Canon's announcement is just a cosmetic change, like the 18-55 mk2 announced earlier.  Nothing to get excited about, nothing to get upset about either.

372
Canon General / Re: APS-C 11mm f/2 Patent
« on: April 05, 2011, 12:01:07 AM »
I wonder if it has a bulbous front element.

373
Canon General / Re: Canon 7D noise observations
« on: April 04, 2011, 12:47:53 PM »
Interesting shooting birds with a 7D 85/1.2 neuroanatomist

The 7D makes me rethink where the weakness of AF lies.  I used to think it was mostly the lens, but a good camera makes a huge difference.

The other day I was shooting skiing action shots with my 7D and 55-250 IS.  Yes, the lowly kit lens.  The lens had no trouble at all keeping up with the action.  It performed flawlessly in AI servo and one-shot.  Mind you the light was strong and contrast was high.  But still I was very impressed.  I've had similar experiences with my 50/1.8 and Tamron 17-50/2.8, two lenses that aren't particularly renowned for AF performance.

Anyways, please excuse the AF thread drift.  Please carry on with the noise conversation.


374
I'd wait if, and only if, the 60D is useless for whatever you're trying to shoot and you're certain the 70D will have the particular feature that you need.

If that doesn't apply, get the 60D.

375
EOS Bodies / Re: 3 More DSLR's in 2011? [CR1]
« on: March 24, 2011, 11:16:48 PM »
Well if there's any truth to this... then I wonder if Digic 5 is on the way.

The 1Ds4 and 5d3 would then get the new chip, and perhaps also a 7D2.  2012 could see the chip trickle down to 70D and 700D.  New chip, more video capability, probably an increment in high iso.

In theory then a 7D2 could have the same 18 mpix sensor as the 7D, 60D and 600D.

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