Weia

Weia

Joined on Dec 2, 2011

Comments

Total: 10, showing: 1 – 10

The old 7-14 is hard to beat, so hope it is equal.

Direct link | Posted on Nov 2, 2014 at 00:35 UTC as 64th comment | 5 replies
On Price released for Brikk's 24k gold Nikon Df article (389 comments in total)

Ultimately ugly...

Direct link | Posted on Oct 30, 2014 at 22:42 UTC as 178th comment
On Tiny fps1000 high-speed camera boasts 18,500fps article (137 comments in total)
In reply to:

Weia: Why those DOS-computer resolutions, why not 720p and 1080p?
And logic speeds like 500 or 1000 fps?

For time studies I would like logical frame rates. I use a simple Casio for athletic coaching, 120 fps mostly. Timing in 0.01 seconds would be nicer.

Direct link | Posted on Oct 9, 2014 at 16:43 UTC
On Tiny fps1000 high-speed camera boasts 18,500fps article (137 comments in total)

Why those DOS-computer resolutions, why not 720p and 1080p?
And logic speeds like 500 or 1000 fps?

Direct link | Posted on Oct 9, 2014 at 11:24 UTC as 49th comment | 2 replies
On 'See Impossible': Canon counts down to... something. article (1669 comments in total)

Hoping for an M2: APS-C, 24 megapixels, tiltable screen.

Direct link | Posted on Oct 6, 2014 at 17:04 UTC as 691st comment
On Post-Photokina polls - Tell us what you think article (198 comments in total)

In picturing small animals the sensor size is always bigger than the object. The things that count are absolute maginifcation and absolute measure of the pixels. Availability of macro lenses is the important thing and so 4/3 is big enough.

Direct link | Posted on Oct 4, 2014 at 14:17 UTC as 61st comment
On Post-Photokina polls - Tell us what you think article (198 comments in total)
In reply to:

TEBnewyork: It isn't as much sensor size vs camera design. RX100 isn't fun to use irrespective of sensor size.

If new LX100 were 1" I would still get it because the camera controls look very friendly to and enjoyable to use.

In picturing small animals the sensor size is always bigger than the object. The things that count are absolute maginifcation and absolute measure of the pixels. Availability of macro lenses is the important thing and so 4/3 is big enough.

Direct link | Posted on Oct 4, 2014 at 14:12 UTC
On My ideal camera's article (2 comments in total)

Hi Serban,
I missed your reaction, sorry.
That non square sensor is even more out of the box than the rest... A super wide angle with zero distortion is less easier to make than a sensor with say 10% distortion, how weird it may be. But maybe the idea goes wrong because of higher order distortion. In that case you still have to correct a picture in the computer and it would be easier to have a square sensor anyway. Correction maybe can be doen in the camera even?

Direct link | Posted on Feb 27, 2013 at 19:57 UTC as 1st comment
On Macro photography: Understanding magnification article (120 comments in total)
In reply to:

kolas: Seems the traditional definition of macrophotography linked to 1:1 or greater lens magnification received a lot of attention in the comments. The truth is, times have changed since film days. Resolving power of today's digital sensors (especially those in compact cameras and cellphones) greatly exceeds that of any film. Therefore one can capture similar amount of detail with camera setups of various sizes.

Example: Take 12MP fullframe Canon 5D with a 100 mm "true macro" 1:1 magnification lens and a 12MP 4/3 camera with a 50 mm "fake macro" 1:2 magnification lens. The same FOV, the same perspective, very similar level of detail captured. But according to the traditional definition, only one of the photos is a true macro photograph! Does that make sense? To me not so much.

Let us redefine macrophotography!

Thanks Kolas for this calculation. My best combination gives 428 pixels per mm, so smallest details are about 3 microns. I did not realize that the micron was so nearby.

Direct link | Posted on Dec 5, 2011 at 16:54 UTC
On Macro photography: Understanding magnification article (120 comments in total)

I do not use magnification, I only need to know how to measure the length of say an insect under certain standardized circumstances. With a Sigma 150 macro on Olympus E-3 at closest focus I have 210 pixels for a millimeter. With a 2x extender it becomes 428 pixels to a millimeter.

But now something very strange. At a holiday I did not want to carry too much so only took my 18-180. At close focus and f=180 it uses only 53 pixels to a millimeter. I bought a 5 diopter close focus lens and it became 107 pixels to a millimeter. But in the field strange things happened when focusing so I did new tests and found out I had to move backwards and to focus on infinity to have the biggest magnification! Now it is 190 pixels for a millimeter. Completely contrary to expectation, unexplicable, but very useful for identifying small insects! Of course the optical quality of the combination is not extremely good.
Just to let you know. Maybe I should buy a close focus lens for the Sigma too.

Direct link | Posted on Dec 2, 2011 at 20:58 UTC as 21st comment
Total: 10, showing: 1 – 10