_sem_

Lives in Pitcairn Pitcairn
Joined on Dec 18, 2008

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Total: 166, showing: 1 – 20
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On article Processor designer ARM acquires Apical (29 comments in total)
In reply to:

maljo@inreach.com: Sounds like a good move.
(I've never heard of either of these companies)

Well I certainly do hope this results in improvements of these DR modes (DRO, ALD, HTP, ALO...) so that the results will get closer to what one can do in LR with a properly exposed raw file. Some particular suggestions:
(1) Stop underexposing the raw data just to make highlights headroom *that the instant-post-processing requires*.
(2) In raw mode, provide raw highlights blowing marks in the in-camera RGB histogram (that'd be as good as UniWB, sans the greenish preview).
(3) Implement LR-like reconstruction of partially blown highlights in-camera.
(4) Offer a few different tonemapping presets (because it is impossible to guess where the emphasis should be and what can be sacrificed in tonemapping).

Link | Posted on May 23, 2016 at 10:55 UTC
In reply to:

Sacred: 2X TC on 400mm f/5.6 is a no-no especially on aps-c. As someone else mentioned, better results could be achieved using p&s superzoom. The only solution is longer focal length lens.

This used to be a no-no mainly because DSLR AF wouldn't work below f/5.6. Some recent better cameras have AF modules that work at f/8 (central AF point at least). For mirrorless (and LV), different restrictions apply. OSPDAF likely fails in low light even earlier, while CDAF should go lower, assuming that the image is steady.
Whether you can get a reasonable shutter time at the resulting aperture and whether the optics are good enough are separate issues.

Link | Posted on May 20, 2016 at 08:34 UTC
In reply to:

Donald B: what is the point of a 28mm macro lens, the designer obviously has never shot macro before.

Well, there is no mainstream "wide macro". This one is as wide as it gets among regular DSLR macros, although it is in fact a normal. Mind the Laowa 15 is an off-brand non-AF exot ;)

Link | Posted on May 11, 2016 at 19:45 UTC
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love_them_all: Great idea. Too bad it's for the EF-M. Please make one for the Canon DSLR.

Yes you can use thin extension tubes with certain wide-angle lenses to get wide-angle macro. But the working distance may get too short for work or even negative (focus point inside the lens), and with many lenses max magnification obtainable this way is rather close-up than macro.

Link | Posted on May 11, 2016 at 10:20 UTC

Is the CP-E4N Li-ion, finally?

Link | Posted on May 11, 2016 at 08:54 UTC as 11th comment | 5 replies
In reply to:

Digitalis32: No mention of the CRI of the LEDs used, their range of illumination or any mention of the ability to control the light ratios between them. Another rushed product.

LED macro lights aren't the best choice for macro, except video, because they don't freeze motion, and proper diffusion also eats light. Proper flash with diffuser works better. But LED is likely better than nothing, well it doesn't cost much.

Link | Posted on May 11, 2016 at 08:52 UTC
In reply to:

love_them_all: Great idea. Too bad it's for the EF-M. Please make one for the Canon DSLR.

Get the Laowa 15/4 macro. Surely possible ;)

Link | Posted on May 11, 2016 at 08:42 UTC
In reply to:

Esign: Macro 45? Maybe, with the LEDs. Greater depth of field than with 100-200 macro lenses. I'm most concerned about distortion, because this lens could be useful as "scanner" of old drawings and other larger documents which I now have to first borrow (it's hard to persuade an archivist) and then take to the copy shop for scanning, and I have to pay $300 anyway.

> "Greater depth of field than with 100-200 macro lenses."
The difference in DoF is likely negligible. What you see is less relative background blur.

Link | Posted on May 11, 2016 at 08:41 UTC
In reply to:

Donald B: what is the point of a 28mm macro lens, the designer obviously has never shot macro before.

Many P&S users like wide-angle macro for the low relative background blur (they think it is more DoF, though this is not the case actually). Check the Laowa 15/4 wide-angle 1:1 macro lens too. But here it certainly has sth to do with budget and compact size.

Link | Posted on May 11, 2016 at 08:36 UTC
In reply to:

ttran88: The real question is when will an OVF ever catch up to an EVF with 425 focus points, eye AF or even WYSIWYG? These benefits far outweigh the one benefit the OVF is hanging on to by a thread.

On the other hand, I'm still looking forward to the time when it catches up with OVF sharpness, without having to zoom.

Link | Posted on Apr 13, 2016 at 21:54 UTC
In reply to:

magneto shot: i thought this is news, until i selected A7ii on the right. it blew the canon like a canon ball.

"But some people are intent on "educating" others that Sony sensors are the only way."
And other people are intent on "educating" others that this issue is so overblown ;)

Link | Posted on Mar 22, 2016 at 14:47 UTC
In reply to:

magneto shot: i thought this is news, until i selected A7ii on the right. it blew the canon like a canon ball.

But the Sony A6000 doesn't seem as good as the D7200?

Link | Posted on Mar 22, 2016 at 11:52 UTC
In reply to:

_sem_: An interesting review of a peculiar lens.
It would be nice to see a macro (or closeup) comparison with a workaround - a wideangle prime on a short extension tube. I hear certain Canon wideangles do reach 1:1 on extension.

Some data here:
http://bobatkins.com/photography/eosfaq/closeup.htm
http://software.canon-europe.com/files/documents/EF_Lens_Work_Book_11_EN.pdf
Doesn't seem to work with the 15mm. Canon's 12mm is a bit thick indeed. I've got a 6mm K1 ring for Nikon, all manual and had to shave it a little bit but works with many wideangles, including various APS-C 18-xxx zooms, AI-s 20/3.5. But none I've tried really got close to 1:1 on extension tubes (incl. thicker ones) before the working distance shrunk to nil.

Link | Posted on Mar 14, 2016 at 08:39 UTC
In reply to:

Kamox: In the rare cases I need strong macro, i use an inversion ring.
Cheap and effective.

It is possible to use ultra-wides on a reversal ring, but that's useful for very strong magnifications only. This one is more valuable for wide-angle close-ups at lower magnifications (at 1:1, no light on the subject...)

Link | Posted on Mar 13, 2016 at 21:34 UTC

An interesting review of a peculiar lens.
It would be nice to see a macro (or closeup) comparison with a workaround - a wideangle prime on a short extension tube. I hear certain Canon wideangles do reach 1:1 on extension.

Link | Posted on Mar 13, 2016 at 21:31 UTC as 29th comment | 3 replies
In reply to:

Mister Roboto: Too expensive, I am using a Generic 8mm f/3.8 Fisheye lens that I bought for 60 bucks.

Not so difficult to find a fisheye which focuses down to 1 inch or so, but in most cases they can't go near 1:1 magnification.
The thinnest available extension tubes are mostly too thick for use with fisheyes and ultrawides. Many wideangles are useful on short extension for wide-angle closeups, but just a few of them get to 1:1 at a positive working distance.

Link | Posted on Mar 13, 2016 at 21:13 UTC
In reply to:

2eyesee: Another APS-C body, but Sony have abandoned APS-C E-mount lens development, and announcing this camera on the same day as three FE lenses is really rubbing our noses in it.

I don't care how good the AF is if after all these years Sony still can't offer a decent kit lens. I got the A6000 when it first came out and returned it because the 16-50 kit lens was so bad. The 18-55 is no better.

Joke is, they still have a better lens lineup than canikon mirrorless

Link | Posted on Feb 3, 2016 at 21:41 UTC
On article Hands-on with the Nikon D5 (409 comments in total)
In reply to:

_sem_: I expected a bigger display...

You can, but that's not very convenient is it? Pity camerphones have much better screens, hehe. The flash radio transmitter is tiny but I also find it very odd that a pro camera this size and $$$$ doesn't have one inside...

Link | Posted on Jan 13, 2016 at 23:09 UTC
On article Hands-on with the Nikon D5 (409 comments in total)

I expected a bigger display...

Link | Posted on Jan 13, 2016 at 11:58 UTC as 37th comment | 6 replies
In reply to:

Jim F: Last bullet point in the description of the D750 firmware update list - "Optimal vibration reduction is now available with vibration reduction lenses." I wonder just what that really means. Does that mean that there is or was a "sub-optimal" option? Curious

@iainlea point 2: Did you use MLU and exposure delay? It is well known that the mirror vibration issue actually gets worse if the camera is rigidly mounted. As for shutter vibration, that's tougher because only electronic shutter or EFCS can work around.

Link | Posted on Dec 8, 2015 at 16:13 UTC
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