liquidsquid

liquidsquid

Lives in United States E Bloomfield, NY, United States
Works as a Analog Engineer
Joined on Dec 1, 2003

Comments

Total: 42, showing: 1 – 20
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In reply to:

Chris2210: So is it antennae or antennas? I'm relaxed about either [no one these days says stadia, do they?]... but it can't be both.

Is it doughnuts or donuts? It can't be both... or can it? Darned English language. Blizzard, wizard. Hmmm

Direct link | Posted on Mar 11, 2015 at 17:15 UTC
In reply to:

Timmbits: The flat shape is very impractical;
they should make them cylindrical (as Panasonic did a very long time ago as an alternative to the gopro, but unfortunately didn't seem to have any success (that's a failure from marketing, not because of the product))
The cylinder is more aerodynamic, harder to snag and bang on things, easier to mount on things like the side of helmets.
This is really playing it safe.
Wish more would innovate.

However... this does tell you for how much those cameras costing hundreds more SHOULD be selling for - what they are really worth!

Contour still makes them cylindrical.

Direct link | Posted on Mar 4, 2015 at 21:58 UTC
On Olympus OM-D E-M5 II First Impressions Review preview (1392 comments in total)

Two words: Lightning Photography!
Can't wait to pick one up, but not until June.

Direct link | Posted on Feb 27, 2015 at 22:54 UTC as 28th comment | 1 reply
In reply to:

liquidsquid: I'm not sure if this is possible. White LEDs contain phosphors to generate the colors other than blue (of which the LEDs are based upon). The phosphors do not really turn on and off that fast. There is a charge time and a discharge time much longer than 1/2,000,000 AFAIK. If anything you will wind up with a rainbow effect on moving subjects as the various phosphors ramp up and back down in brightness as different colors will have different response times.

I suppose if you heat the phosphors, they turn on and off faster. Also it may be that the peak power so overwhelms the ramp-up and down, it doesn't matter. The again I don't think those images are in the 1/2Meg range.

Direct link | Posted on Dec 3, 2014 at 20:46 UTC
In reply to:

liquidsquid: I'm not sure if this is possible. White LEDs contain phosphors to generate the colors other than blue (of which the LEDs are based upon). The phosphors do not really turn on and off that fast. There is a charge time and a discharge time much longer than 1/2,000,000 AFAIK. If anything you will wind up with a rainbow effect on moving subjects as the various phosphors ramp up and back down in brightness as different colors will have different response times.

Oh, bear in mind that a bare-die LED (one without phosphors) can switch on and off at a pretty good clip (small LEDs can go 10MHz+), but a lot depends on the physics of the LED's die, and the size of it. A big honking high-power LED has a lot of self-capacity, meaning it is difficult to turn the LED on and off quickly, especially at 2MHz rates. The assumption is you use a high-power driver circuit that can reverse-current briefly to drain that charge back out.

The developer is best-served using multiple-color LEDs rather than whites to avoid phosphors, and a good diffuser to mix those colors before reaching the subject.

In all, I think is price point is not going to be met unless volume is rather large.

(p.s. I am an engineer and have worked on such things, though not for flash photography)

Direct link | Posted on Dec 2, 2014 at 21:58 UTC

I'm not sure if this is possible. White LEDs contain phosphors to generate the colors other than blue (of which the LEDs are based upon). The phosphors do not really turn on and off that fast. There is a charge time and a discharge time much longer than 1/2,000,000 AFAIK. If anything you will wind up with a rainbow effect on moving subjects as the various phosphors ramp up and back down in brightness as different colors will have different response times.

Direct link | Posted on Dec 2, 2014 at 20:11 UTC as 6th comment | 5 replies
On Budget M43: Kodak Pixpro S-1 First Impressions Review article (137 comments in total)

Surprising high ISO results for a first release. Hmm...

Direct link | Posted on Jun 24, 2014 at 11:16 UTC as 41st comment
In reply to:

liquidsquid: Tempting... one of my favorite lenses is a 50mm F1.x (cannot remember right now) old good Minolta adapted to m4/3. It would be nice to get automatic features and less coma wide-open.

Hopefully it is under $1K, but I doubt it.

Yeah, but it was $35, and the center of the lens is far better than the edges. Playing in the "sweet spot". Honestly I don't use it much any more, got tired of the manual focus struggle on moving subjects. I could nail quite a few shots by pre-focusing, but it required too much thinking.

Direct link | Posted on Jan 7, 2014 at 13:46 UTC

Tempting... one of my favorite lenses is a 50mm F1.x (cannot remember right now) old good Minolta adapted to m4/3. It would be nice to get automatic features and less coma wide-open.

Hopefully it is under $1K, but I doubt it.

Direct link | Posted on Jan 6, 2014 at 20:23 UTC as 83rd comment | 2 replies
On Homemade rig captures extreme macro shots of snowflakes article (186 comments in total)

I've got to try this! Plenty of subjects around here.
To get rid of the monochrome result you could use a few color-tuneable RGB LED hobby kits placed at different locations. That may add some real pizzaz to the result without post.

Direct link | Posted on Dec 2, 2013 at 16:28 UTC as 71st comment | 2 replies
On Fujifilm X-E2 Preview preview (454 comments in total)
In reply to:

REDred Photo: Lately, I've been downloading full size jpg portrait samples from the new cameras and comparing them in Photoshop. The goal is to see how well the images will perform at large print sizes so I up the resolution to 40 inches on the short edge at 240 dpi. I then view all the different images at about 42% so that my monitor is displaying almost exactly actual print size. Then I compare to a portrait I scanned from 6x7 medium format slide film roughly equivalent to 60mp.

Generally, all the digital camera files tend to look a little too plastic smooth, especially in areas where the image subject is a single color. When up-resed to 40x60, digital noise looks chunky and artificial. The film has a very random fine grain that shows even in smooth, same-color textures such as the whites of the eyes... this fine texture, although not as "clean" as digital, just looks so much more natural and organic. These observations are not surprising to anyone familiar with high resolution film.

Makes one wonder if you were to apply a "film-grain" process to the "clean" digital images if it would better resemble the MF image, which I would suspect is the case. I am curious to see what you think of this, and I am likely wrong. It sounds like you have the tools to check this idea though. Too bad there isn't a silver-halide crystal grower filter ;-).

I would rather start at the low-noise images and add noise to taste, then take a noisy image and attempt to extract.

Direct link | Posted on Oct 18, 2013 at 17:28 UTC
On Olympus OM-D E-M1 Review preview (2078 comments in total)
In reply to:

Heefe: Funny how people are so obsessed with the size of the sensor...

OMG, for all of the "experienced" photographers around here, they sure fail at math.

F2.8 (or any F value for that matter) of full frame exposure time for the same ISO ratings is the SAME as exposure time on a smaller sensor like m4/3 at equivalent focal length. How hard is that? The ONLY difference is DOF.

Sure light gathering ability is greater on the larger lens, but that is to cover a larger area of sensor, so the light is spread over a greater area. The light intensity on ANY GIVEN SURFACE AREA of the sensor is the same. Note AREA not the same as PIXEL.

Direct link | Posted on Sep 13, 2013 at 16:26 UTC
On Panasonic GX7 First Impressions Review article (1201 comments in total)

That little patch of greenery is the most telling, as it seems to confuse the snot out of the NR routines. The Sony NEX shows artifacting, The GX7 shows smearing, the EP-5 handles it well with just some resolution loss, and the RX100 II smears it out as well, but not as bad as the GX7. Of course this is all at ISO 12800, a setting I have never used.

Still considering the sensor size and resolution... if I have to look this close to see a flaw consider me really impressed.

Of other Note: Greenery is cyan-ish on Sony, yellow-ish on the m4/3 which is consistent with my experiences with the same WB settings.

Direct link | Posted on Aug 15, 2013 at 12:53 UTC as 128th comment
On Panasonic Lumix DMC-GX7 Real-world Samples article (148 comments in total)
In reply to:

liquidsquid: Any chance of taking a long night-exposure of the stars, aurora or a night cityscape? Something in the 10 second or more range lowest ISO and ISO400 or more would be awesome, as that is something all of my micro 4/3 cameras over the years would struggle with. Lightning shots were never really "pow" shots like with my old Sony DSC-R1 had.

I've owned G1 and the GH2, and after a few tries with long night exposures, have sort of put it aside until technology catches up on these smaller cameras.

The OMD is great at it from what I have seen, no argument.

The older Panasonic sensors (G1, GH2) would produce a mottled-looking dark background instead of a film-like grain gradient. Also they are very bad at hot pixel noise, which is worse the longer the exposure no matter the ISO or using dark-frame. You can get fake stars in post if two hot pixels are adjacent. Re-mapping doesn't help BTW as they are not saturated pixels, only more sensitive by a little.

Once I noticed these problems, I couldn't let it go as it looks very unnatural and almost impossible to remove in post. I do have some great lightning shots, but the dark sky backgrounds are still mottled, and it does show up in print. I also have to manually remove the hot pixel noise for those few fake stars. I also had problems with horizontal streak noise from interference on both cameras on anything but the lowest ISO if I pulled the exposure at all of the darks.

Direct link | Posted on Aug 15, 2013 at 12:44 UTC
On Panasonic Lumix DMC-GX7 Real-world Samples article (148 comments in total)

Any chance of taking a long night-exposure of the stars, aurora or a night cityscape? Something in the 10 second or more range lowest ISO and ISO400 or more would be awesome, as that is something all of my micro 4/3 cameras over the years would struggle with. Lightning shots were never really "pow" shots like with my old Sony DSC-R1 had.

I've owned G1 and the GH2, and after a few tries with long night exposures, have sort of put it aside until technology catches up on these smaller cameras.

Direct link | Posted on Aug 14, 2013 at 20:16 UTC as 30th comment | 4 replies

Great price for a monitor with these specs and size. Too bad this is just a hobby!

Direct link | Posted on Apr 2, 2013 at 01:40 UTC as 16th comment
On Just Posted: Nikon D600 In-depth Review article (498 comments in total)
In reply to:

photo nuts: This camera will (i) seal Nikon's status as the bestselling DSLR manufacturer worldwide (ii) stem the loss of converts to mirrorless cameras (iii) help ensure FF DSLRs stay relevant for many more years.

While Canon had a massive head-start when digital DSLR cameras were first launched, it appears they are now losing steam rather quickly... Way to go, Nikon!

Yeah, big, honking camera to drag with you on a trip that is darned near impossible to conceal or hike with vs. something that fits in a car console. I never have been a fan of FF due to bulk and feeling a bit ridiculous carrying one. I feel like people expect me to be a pro when I am only a hobbyist.

Each system has its place, and can compliment each other if you have bags of money for lenses. The gap for IQ is narrower than ever, so now DOF is the real differentiating factor.

Direct link | Posted on Nov 14, 2012 at 02:38 UTC
In reply to:

nixda: Here are two things I'd like to see in a camera that haven't been mentioned before:

1. Square sensor. The image circle is a, um, circle, so why tossing out valuable sensor real estate? Aspect ratios can be selected via the menu or in post-processing, if desired. Also, one wouldn't have to struggle with landscape vs. portrait orientation and all that brings with it when it comes to holding a camera or mounting it to tripod heads.

2. The edges of the bottom plate should be shaped to be compatible with the Arca-Swiss standard.

Hexagon would make more sense, more could be cut from a round die and cover more of the image circle than even a square.

Direct link | Posted on Oct 20, 2012 at 11:49 UTC
In reply to:

dbateman: Quote"Panasonic can't circumvent the laws of optics, and the 35-100mm F2.8's small size means it can't offer the kind of subject isolation and background blur that you'll get from F2.8 zooms on cameras with larger sensors."

I think they really tried. Look at the Minimum focus distance!! Its 85cm, that alone is one reason why I will buy this lens. Most are 150cm. Moving in close to your subject at a even a large aperture, WILL provide suject isolation from background.
Dpreview should test this law of physics to show that subject isolation will be great with the panasonic!

Soon, easy in-camera processing will allow any level of subject isolation you wish, regardless of aperture. Start with a small aperture, and do anything you want to the image after the fact. Start with a large one... no way to recover an already blurred image. Already done with "toy" filters.

At least the F2.8 allows some fast shutter times on low ISOs for fast-moving kids without having to be in their faces.

In other words, having the desired effect of subject isolation produced by an expensive lens will not be a factor in the near future unless you are a "purist" (aka Ludite).

Direct link | Posted on Oct 3, 2012 at 01:04 UTC
On Just Posted: Panasonic Lumix DMC-GH3 preview article (80 comments in total)
In reply to:

Timmbits: With smaller cameras coming out with larger sensors, I no longer understand why a modest sensor in such a large body. Take, for example, the Samsung NX20, with an APS-C sensor, a very nice size and great ergonomics, and the NEX system.
With new developments and choices on the market now, I can't help but wonder if 4/3 was a myopic miscalculation.

Likely SYSTEM size. Try out a 300mm lens on any of these and tell me who wins. Of for that matter any lens of equivalent capability. It isn't just the body that counts.

Direct link | Posted on Sep 19, 2012 at 11:06 UTC
Total: 42, showing: 1 – 20
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