new CV 12mm

[Alnitak]

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Thanks Jeff! It seems I need both ;-)

I think I will just buy first 15mm which is available as M already today.

 

 

I don't fully understand. From one side 12mm doesn't show red edges, but from other side you want to process it with CornerFix? What is reason? If for removing vignette - why not RAW developer soft?

 

The 12mm does show the red edges, its just not as bad as the 15mm in this regard. So, CornerFix is still required to correct that problem. Look at the shots I posted earlier in this thread to see the red, or see below.

 

Comparing the 15mm and 12mm for red edge, first the 12mm:

 

 

And now the 15mm:

 

 

You can see there is a substantial difference in the amount of red one gets.

 

Also, the M-mount 12mm is expected to be available in about 30 days.

 

Jeff

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[Jerry_R]

It was supposed to appear since March, wasn't it?

No news?

[ho_co]

Okay, I admit it up front: Picky, picky, picky.

 

Two quick corrections:

 

1) There's no such thing as "perspective distortion." Proper term would be "perspective exaggeration" or, better, simply what it is: "converging verticals." (We don't recognize it as a problem when it's horizontal, like railroad tracks.)

 

Note: If you project the image to life size and stand as close to it as the lens was, the "perspective exaggeration" disappears. Simple test: Look into someone else's eye from, say, 10 cm. The eye and nose will appear large, the ear smaller, the room tiny in comparison. It's exactly the same with a wide-angle rectilinear lens.

 

This "perspective exaggeration" appears because of the mismatch between viewing distance and taking distance.

 

 

2) This effect is the opposite of "keystoning." Compare PhotoNotes.org Dictionary - Keystoning and PhotoNotes.org Dictionary - Converging verticals.

 

A keystone is wider at the top than at the bottom (the opposite of what is shown here), in order to lock the sides of an arch in place. See Keystone - Definition from Merriam-Webster Dictionary, and the accompanying illustration, arch.

 

To be fair, some websites do misapply the word 'keystoning' to an image projected downward, but this is a sloppy and erroneous extension of the concept, because one doesn't need a keystone when sinking an arch into the ground (because the earth supports it), only when raising one above ground (because the keystone supports the arch).

[EricC]

It was supposed to appear since March, wasn't it?

No news?

 

From CameraQuest web site,

 

Estimated shipping 20/03/10