August 29, 2014, 06:17:56 PM

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Messages - Sporgon

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166
Canon General / Re: DOF and Sensor Size
« on: July 01, 2014, 10:37:47 AM »
I think basically sensor size / format size only effects dof when you put a lens on  ;)

167
Software & Accessories / Re: Tripod centre column - yes or no
« on: July 01, 2014, 06:57:53 AM »
Centre column is useful to have. If you're using the tripod to hold the camera rather than critically support it at lower speeds, then use it for convenience. But when requiring critical stability don't use it, extend the lower legs instead. This is how I use my 058.

So the moral is get a tripod than can extend to head height with leg extension alone, central column is a bonus.

168
Lenses / Re: Any word on the 50mm with Image Stabilzation?
« on: July 01, 2014, 06:41:31 AM »
As has been pointed out, the other three IS primes that have replaced the old non IS ones have not lost any speed, but then they were slower lenses than a 1.4, and I'm not sure if there are technical issues in featuring IS on such a fast lens.

Agree with the point at top of page; wouldn't surprise me if it was '1.7' as a marketing differentiation, because we all know there is no (real) difference between 1.8 and 1.7.

Or will it be an f2 based upon a modified planar pancake design ( like the 40 pancake) but set deep into the 35 IS body to give room for the IS ?

Either way I wish they'd hurry up 'cos I want the EBP to evaporate before I stick my hand is my very dusty wallet.

169
Lenses / Re: Canon EF 16-35 f/4L IS Sample Images
« on: July 01, 2014, 06:15:44 AM »

Another issue with an image stabiliser is that it takes a few seconds to settle. If you just point and snap, there a possibility that the gyros and elements haven't settled and you get soft images.

This is really scraping the barrel when it comes to points against IS !  ;). Only switch it on when you need it !

Personally I'm all for IS in standard / wide angle focal lengths. I have absolutely no desire to carry a tripod to some of the places I go, and inevitably I end up shooting landscapes in low, fading ( or ascending ) light. I'm still old fashioned enough to not want to wack ASA up, so IS often enables me to get the shot with suitable dof and no ( at least damaging) shake.

However I'm fully aware that a shot taken in this way will not be as critically sharp as one from a solid platform.

170
Third Party Manufacturers / Re: D810!!!
« on: June 28, 2014, 04:57:12 PM »

Nikonian linguistic analysis: the -10 suffix translates to 'fixing a problem'.  The SB910 fixed the thermal issues of the SB900.  The D610 fixed the oil spatter and banned-from-sale-in-China-debacle of the D600.  The D810 fixes the problem Nikon had of producing both the D800 and D800E.

I wonder if there is a neuroanatomist-10 in the nikon forums...

+1
perhaps we can start a poll for the most requested/needed feature changes and improvements ;)

I propose a poll to see who among the CR members neuroanatomist, dilbert, or Aglet has provided the most helpful/useful/beneficial information to the other members of the forum.  The one with the most votes earns a pat on the back, the other two are permanently banned from CR forums.  I'll abide by the results if you two agree to do so as well.  What do you say, gentlemen...are you ready to put your reputations on the line?

Where do we sign up ?

171
Third Party Manufacturers / Re: Zeiss Otus Initial Impressions
« on: June 28, 2014, 07:38:23 AM »
Another from Iceland. This is Gullfoss, the largest fall in Europe (I´m told). Quite spectacular.

5DIII, 1/640s, f5.6, ISO100, pola filter

Wow, must go there sometime. Great images, especially like the one if the house.

172
EOS Bodies - For Stills / Re: Dynamic Range Question
« on: June 28, 2014, 03:22:58 AM »
Your result is from bad post processing and has nothing to do with DR. It looks like you have held highlights despite direct sunlight and slight overexposure and shooting in jpeg.

The slight increase in latitude of the exmor type sensor allows for a little more extreme shadow recovery with less noise. When it comes to the highlight end there is little practical difference.

173
EOS Bodies / Re: 7D mark 2 crop vs full frame
« on: June 27, 2014, 05:22:25 PM »

Factor that into your portability equation.  If I shot mirrorless, I'd burn through an average of five or six batteries per day while on vacation, versus one on my 6D.  That pretty much balances out the weight difference by itself.

That's a good point. I've just returned from a trip (trying) to get a shot of the Giant's Causeway in Ireland. I'd been down the evening before when it was deserted but light was really poor. Went the next day and there were hundreds of people there from many coaches. Seemed to be mostly American and Japanese tourists, everyone taking pictures on either a smartphone or Nikon DSLR. Didn't see a single mirrorless. (Didn't see a single Canon DSLR either ! )

Using a prism and mirror to see through the lens doesn't require any energy does it ? What a clever idea !

174
Lenses / Re: EF 16-35 F/4L IS corner samples & comparison
« on: June 23, 2014, 06:23:58 AM »
I can't help think that the f2.8 was slightly over exposing and the f4 is slightly under? There's a huge difference in the blue sky colour between them.

I've noticed that my f4 zoom lenses under expose by about one third when compared with faster lenses. At first I thought that this must be to do with the lower 'T' stop, and indeed the difference in exposure fitted the difference in the 'T' stop of the lenses exactly - until I got the 24-70 f4 IS which has a 'T' stop of f4 yet does exactly the same thing. Can anyone explain why this should be the case ?

175
That's why I am asking. I don't understand where is the issue? So many are complaining about it, so it does exist, I just can't get it.

It all depends upon how much you are moving the camera after focusing. Generally the dangers of back focus from 'focus and recompose' are way over stated nowadays.

If you want to create the effect for yourself shoot a subject from around three feet away, focus and re compose moving the camera at least six inches ( on the subject ) down/across between focusing and shooting. Then compare this with using an outer point which enables much less movement of the camera plane. You will clearly see the 'focus recompose' is back focused when using f1.2 to f2 or so.

In most situations you are not moving the camera enough to cause a problem, or the depth of field is covering the issue, or both.  I'm surprised at the Hasselblad video showing such a tiny movement as a demonstration of it's intelligent focus system; moving from the eye to nose: indeed different focus distances but not plane, which is what their system is about.

Likewise the example always given of woman/camera at waist height/distance/angles. For this to work the camera must be held at waist height and very close; a full length portrait with 'focus/re compose on the eye, a large camera movement. So if you are ever going to take a full length shot filling the frame with a 50mm lens at f1.2-f2. holding the camera at waist height and 'focus/re compose will be a problem. But the point is that in the vast majority of situations you won't be moving the camera this much. This is why many people think the problem doesn't exist; it does, much of the time to a degree, but it can only be seen given the right circumstances.

176
EOS Bodies / Re: 7D mark 2 crop vs full frame
« on: June 21, 2014, 02:14:54 PM »
Just how would a FF '7D' fit into the current 6D/5D/1D line up ? As has been pointed out it would hardly be a 7D anyway. The crop bodies offer faster, lighter, greater dof - all of this cheaper than the equivalent FF.

Why would it want to be FF ?

( Note: those wanting a 1Dx re-badged as 7DII at 7D prices need not reply  ;). )

177
Landscape / Re: Beautiful sunsets
« on: June 19, 2014, 05:55:06 PM »
View from 'Church Hill' looking over the Vale of York, England.

178
Reviews / Re: DxO reviews Sony A7s: king of low light photography?
« on: June 19, 2014, 02:29:07 PM »
One word:  dilbertland

Do dilbertland and dxomarkland border each other ? I wonder if they have a common currency. They clearly speak the same language.

179
Even photozone's at it now; comparing against the EF 50mm f1.2 L II !

What the 50L does well doesn't have a metric that can be easily recorded.  That lens is about color, draw, bokeh, etc. and less about meat and potatoes forum fodder like sharpness, chromatic aberrations, distortion, etc.

However, the Sigma Art seems purpose-built to wow the forum crowd.  If you are a sharpness junkie (who needs AF), you've found your lens.

- A
Well said :)

Duh ! Now everyone's at it. When canon finally do bring out the 50 1.2L II they had better call it something else or no one will notice !

180
Reviews / Re: DxO reviews Sony A7s: king of low light photography?
« on: June 19, 2014, 01:13:59 PM »

Anyone that focuses on image quality always uses raw files at ISO 100 on tripod. Everything else is a compromise in one form or another.


For once you've got something right ! Bravo !




(assuming you are referring to shooting subjects that do not move..............

in good light.........

before 2005......)

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