Entropius

Lives in United States Tucson, AZ, United States
Works as a Physics PhD Candidate
Joined on Jul 17, 2006

Comments

Total: 193, showing: 1 – 20
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On article Have Your Say 2017: the winners (204 comments in total)
In reply to:

FrankZayas: Is it just me, or are camera prices getting out of hand?

Prices for the absolute high end, yeah.

But I went to the Smithsonian Museum of National History a few years ago. There they have a wildlife photography exhibit with five foot tall prints of stunning shots, with full EXIF. A lot of them were shot with D300's.

You can get a used D7200 for under $500, which blows the D300 out of the water in sensor quality and matches it in most everything else.

Link | Posted on Jan 7, 2018 at 02:08 UTC

We already have primitive metalenses, where "metalens" means "lens with features whose sizes are comparable to the wavelength of light and which uses fancy phase interference properties to focus light in a way that can't be explained with ray optics."

I have one here: the Nikon 300/4 PF.

Link | Posted on Jan 5, 2018 at 07:11 UTC as 30th comment
In reply to:

Akgbkd: Can i know, which camera was used to capture these shots

The EXIF says a Panasonic GH5.

Link | Posted on Jan 2, 2018 at 15:41 UTC
In reply to:

newmikey: Reading some of the replies, I'm reminded again and again of how correct the developer team were to resist releasing a Windows port. Pearls before swine, no more no less.

"Free Lightroom alternative Darktable is now available on Windows" is also such a misleading title just as Gimp is not a "Photoshop alternative". Darktable is darktable, no more, no less. It runs best in its native Linux mode, not when patched to account for a terrible OS architecture such as Window.

You either use it as a raw converter on individual raw files (by right-clicking on the raw file and selecting 'open with darktable') or use it to convert whole directories or even as DAM application.

What counts to me is less about how it converts wrong exposures, off-colors or other photographer-errors but more about what it does to correctly exposed raws. I've been using dt for many years now and like its UI and the thinking behind it. I can fully understand there are people who think differently: don't use it!

Thanks for your information! I currently use Picasa (since it's actually *fast*) on Windows for DAM and Lightroom for processing. But I'm quite impressed with RT's image quality; I have yet to really dive into what DT is capable of. But I'm glad to hear that digiKam does a good job of DAM; that's something I'm missing on Linux.

My laptop (Dell XPS 13) is Linux-only, so it'd be very nice to have a good raw converter there.

Link | Posted on Dec 29, 2017 at 01:21 UTC
In reply to:

newmikey: Reading some of the replies, I'm reminded again and again of how correct the developer team were to resist releasing a Windows port. Pearls before swine, no more no less.

"Free Lightroom alternative Darktable is now available on Windows" is also such a misleading title just as Gimp is not a "Photoshop alternative". Darktable is darktable, no more, no less. It runs best in its native Linux mode, not when patched to account for a terrible OS architecture such as Window.

You either use it as a raw converter on individual raw files (by right-clicking on the raw file and selecting 'open with darktable') or use it to convert whole directories or even as DAM application.

What counts to me is less about how it converts wrong exposures, off-colors or other photographer-errors but more about what it does to correctly exposed raws. I've been using dt for many years now and like its UI and the thinking behind it. I can fully understand there are people who think differently: don't use it!

It seems like it has a bunch of excellent features (in addition to Linux support, which is what I mostly care about) -- in particular, the wavelet-coefficient equalizer and filter seems like an incredibly powerful tool.

Given that Adobe is determined to make Lightroom suck, I'm in the market for an alternative, and it's between DT and RawTherapee...

Link | Posted on Dec 28, 2017 at 23:27 UTC
On article Canon patents 400mm F5.6 catadioptric 'mirror' lens (247 comments in total)
In reply to:

Gil Aegerter: I've owned a couple of the old Nikkor 500mm mirror lenses -- bought the first one in 1986, the only new Nikkor I've ever owned. Image quality could be good in the right conditions, but the basic problem I found was one of steadiness. These lenses are very light for their focal length, and hence very susceptible to shake. I found I had to shoot from a very rigid tripod or put it on a monopod so I could act as an absorber. Maybe newer bodies with stabilization could solve that. https://www.flickr.com/photos/tags/nikkorcreflex500mm

I dunno why Nikon (what I shoot) and Canon can't figure out that in-body IS is a fantastic thing.

Link | Posted on Dec 16, 2017 at 15:49 UTC
On article Canon patents 400mm F5.6 catadioptric 'mirror' lens (247 comments in total)

Why on earth would you want to decrease the amount of light coming in a lens like this without increasing depth of field? No wildlife photographer says "Gee, if I only had less light, I could make a picture out of this!"

As someone who has used long lenses for a while, my 80-400/5.6 stays at f/5.6 and my 300/4 stays at f/4 except in rare circumstances where I need more dof...

Link | Posted on Dec 16, 2017 at 15:47 UTC as 22nd comment | 1 reply
On article UPDATED: Sony a7R III is still a star eater (471 comments in total)
In reply to:

TheEnthusiast: Good grief. What percentage of photographers shoot single-pixel stars? About 0.01% or is that too high? On the other hand, pointing out this near-catastrophic shortcoming might actually scare off the 3% who think it could matter to them. Somebody needs to get a life.

I'm quite happy shooting Nikon DX. But if I ever go fullframe it will be to do night landscapes better, and this sort of nonsense would be a complete dealbreaker.

Raw should mean raw. If I want to smudge stuff I can do the math myself.

Link | Posted on Nov 23, 2017 at 22:43 UTC
In reply to:

Jefftan: those shot don't seem any different than my A6500 and 10-18mm (or EF-S 10-18 if one like Canon)
Only difference is F4 vs F1.8 and APS-C vs full frame

huge difference in weight and price
worth it or not you be the judge

i said not worth it, I don't need thin DOF (look ugly to me)

F1.8 only use to me is for low light can use 2 stop lower ISO (tolerate the thin DOF)

If it's really damn dark, you might care about those extra two stops.

Link | Posted on Nov 16, 2017 at 13:34 UTC
In reply to:

Jefftan: if use this lens in F11 for landscape htan this F1.8 is a total waste

Paid high price and heavy weight for that F1.8

This lens is for:

1) Artsy-fartsy bokeh tricks or portraits of dogs with ridiculous noses
2) Astrophotography

Link | Posted on Nov 16, 2017 at 13:33 UTC
On article First samples: Leica Thambar-M 90mm F2.2 (223 comments in total)
In reply to:

coudet: $6,500 for a lens worth $0.99

Hammers aren't that pricey these days either.

Link | Posted on Oct 31, 2017 at 11:45 UTC
In reply to:

Becksvart: This looks like a very interesting addition. Large? The 18-105 is large, so is the Samyang 16/2, both balance rather well with two hands. Astro will probably be done angled up. I know I wouldn't hold the camera and this lens in one hand often and I wouldn't put the camera on a tripod with the lens pointing straight forward either.

Am more interested in bokeh and coma characteristics, I'm sure it will be fairly sharp towards the centre at f/1.4.

By those standards the Sigma 18-35/1.8 is positively gigantic then...

Link | Posted on Oct 28, 2017 at 07:48 UTC
In reply to:

paulfulper: Monstro doesn't belong to any language , in Italian it would be Mostro

Whenever I teach atomic physics, I tell the story of the discovery of spectral lines in the Sun that didn't correspond to any known elements on Earth. Some of the students figure out that this corresponds to a new element not known on Earth, and I ask -- well, okay, what would you call that element? Sunium?

Then I make them try to find it on the periodic table, and even ask what "sun" is in other languages that the scientists might have known. Nobody figures it out.

Then I point out that so many of our chemical names are Greek, and ask what the name of the Sun is in Greek.

... students, even good ones, don't know this!

Link | Posted on Oct 9, 2017 at 16:49 UTC
On article Sigma to reveal new lens at PDN PhotoPlus Expo 2017 (51 comments in total)
In reply to:

fishy wishy: I want a 45-135 f2.8 for dance photography, preferably one that keeps the same length in operation. Anything close to that range will do, so I don't need to keep swapping setups. A 24-105 f4 is too slow and the extending mechanism is tiresome.

Would Sigma's 50-100/1.8 do, or are you on FX?

Link | Posted on Oct 5, 2017 at 22:20 UTC
On article Sigma to reveal new lens at PDN PhotoPlus Expo 2017 (51 comments in total)
In reply to:

ihaveworms: I'd like to see more e-mount lenses. Some more targeted towards the aps-c line would be nice.

Nikon doesn't want to make DX lenses, so that'd be most welcome. Sigma's f/1.8 zooms are wonderful ... but too heavy and too expensive if you just want fast primes.

Link | Posted on Oct 5, 2017 at 22:19 UTC
In reply to:

neatpicture: I had Iphones at the the beginning, had android for the last 5 years... getting ready to go back to iphone. I am tired of having a phone that needs to be babysat a like a PC. I want a phone that just works with no fuss and no maintenance from my side.

What sort of babysitting are you talking about?

Link | Posted on Sep 15, 2017 at 22:41 UTC
In reply to:

vadims: > Let the smartphone camera wars begin.

What would be really nice is camera manufacturers waking up from their slumber and starting to address huge gap in connectivity and workflow convenience they have to smartphone manufacturers...

I just can't understand why they keep doing it so badly. SnapBridge is overengineered and undercapable...

Link | Posted on Sep 15, 2017 at 22:40 UTC
In reply to:

Mark Turney: It’s still Android 🀒.

If you buy a computer designed for Windows, you can run other operating systems on it.

If you buy a phone designed for Android, you can run other operating systems on it too -- or replace enough of the built-in apps with other things that it does whatever you wished it would do.

Link | Posted on Sep 15, 2017 at 22:39 UTC
In reply to:

panther fan: ISO 35 on a medium format Sensor. WOW!!!
There is no arguing that this is a true step above every other FF and MF camera.

Isn't it just ISO 35 because the tighter filters reject more light?

Link | Posted on Sep 13, 2017 at 16:11 UTC
On article Don't fry your sensor if you're shooting the eclipse (25 comments in total)
In reply to:

Suntan: FWIW, I shot the eclipse, wide angle, with two different cameras. Neither had filters. Both are fine.

You didn't use a 400 f/2.8 lens for six seconds, presumably because you are not an idiot,. :)

Link | Posted on Aug 24, 2017 at 02:20 UTC
Total: 193, showing: 1 – 20
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