brumd

brumd

Lives in Netherlands Netherlands
Works as a Web developer
Joined on Feb 8, 2012

Comments

Total: 72, showing: 1 – 20
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On Sources of noise part two: Electronic Noise article (231 comments in total)

really really useful series of articles! Thanks so much DPR!
I might have to read both of them twice again for the info and the concepts really to sink in, but I think I am beginning to understand what this means practically.

Let's see if my thinking is correct: I shoot an OM-D E-M5 (usually with f1.8 primes). I looked at the Exposure Latitude & ISO Invariance test of the E-M5 II (and I am going to assume this will be very similar to my M5 I). And I see from the ISO Invarience test that I can easily pull up the shadows +3EV.

I am shooting in a theatre, lens wide open (f1.8), shutter speed at max. 1/125 to avoid subject blur. And "normally" to have "correct" exposure I would use ISO1600.
BUT.. I understand now, I would be better off, if I keep the values for A and S (same exposure), but reduce my ISO to 400, or even 200, because, that way I will retain more of the highlights (very useful in uneven lit stage events), and I won't have more noise in my shadows.

Is this correct?

Direct link | Posted on May 13, 2015 at 21:31 UTC as 52nd comment | 2 replies
On Field Test: Sigma 19mm, 30mm and 60mm F2.8 DN lenses article (159 comments in total)
In reply to:

brumd: I own the first version of the 30mm/2.8. I used it on my E-M5 body. The peculiar thing is that when this lens is on my camera, it takes ~2-3 sec longer for the camera to start up. Since I have the habit of switching on/off my camera a lot between shots, this quickly becomes very annoying. And I quickly stopped using it.

Am I the only one who experiences this? Or, is this a known issue of the first version, and has it been addressed? Or, do they still have a noticably longer start-up time than other lenses?

thanks! It's confirmed then. I tested it again today, and maybe the delay is 1-2 seconds, but it's the only m4/3 lens (and I have used many) that does this. Strange.

Direct link | Posted on May 9, 2015 at 21:07 UTC
On Field Test: Sigma 19mm, 30mm and 60mm F2.8 DN lenses article (159 comments in total)

I own the first version of the 30mm/2.8. I used it on my E-M5 body. The peculiar thing is that when this lens is on my camera, it takes ~2-3 sec longer for the camera to start up. Since I have the habit of switching on/off my camera a lot between shots, this quickly becomes very annoying. And I quickly stopped using it.

Am I the only one who experiences this? Or, is this a known issue of the first version, and has it been addressed? Or, do they still have a noticably longer start-up time than other lenses?

Direct link | Posted on May 8, 2015 at 19:44 UTC as 69th comment | 3 replies
In reply to:

zsedcft: Where is the image on the lightroom 6 box taken? I have that same kind of picture a few times but haven't figured out where it is yet.

Beautiful place, and not very easy to reach. It's a 10 hour round trip hike, with 1000 meter ascend.
You might want to check Kjeragbolten too. It also requires a hike with some scrambling, but still easier to reach. Especially when lugging your D800.. ;)

Direct link | Posted on Apr 22, 2015 at 18:50 UTC
On Nikon 1 J5 offers 20.8MP BSI sensor and revamped look article (152 comments in total)
In reply to:

Homam: What good is 4k at 15 fps?

I'm not a video shooter, and I admit, I haven't read the full thread, but wouldn't this be useful to generate 8MP still pictures at a continuous 15fps rate?
At least, that's whould I could see myself using it for.

Direct link | Posted on Apr 2, 2015 at 09:58 UTC
In reply to:

Nikolausz: I've been making such things for couple of years and document many things on my blog:

http://fiberstrobe.blogspot.de/2012/06/flexible-hoses.html

http://fiberstrobe.blogspot.de/2012/07/twin-flash-adapter-step-by-step.html

http://strobist.blogspot.de/2011/03/if-you-cut-one-light-off-three-more.html

What I can conclude from my experience is that this LED based system will be OK only for tripod home-studio photography. For real macro (hand-held), you need a short duration but huge amount of light (flash). The optical fibers "eat" the light big time. Adding diffusers, modifiers as well.

Yes, but they are also quite pricy, and they have to transfer light, not fluids.

Of course, you don't *need* a FabLab, but it makes a lot easier once you have working prototypes to share it with others. I happen to have set up a local fablab, and the wonderful thing about them is they are accessible to anyone, either for free, or for a nominal fee.
Projects like these are exactly the kind of thing they are intended for: experiment to improve your design, and share those designs with others.
But, of course, this isn't the *only* way.

Direct link | Posted on Mar 28, 2015 at 11:30 UTC
In reply to:

Nikolausz: I've been making such things for couple of years and document many things on my blog:

http://fiberstrobe.blogspot.de/2012/06/flexible-hoses.html

http://fiberstrobe.blogspot.de/2012/07/twin-flash-adapter-step-by-step.html

http://strobist.blogspot.de/2011/03/if-you-cut-one-light-off-three-more.html

What I can conclude from my experience is that this LED based system will be OK only for tripod home-studio photography. For real macro (hand-held), you need a short duration but huge amount of light (flash). The optical fibers "eat" the light big time. Adding diffusers, modifiers as well.

Thanks for those links! My first thought was that most of the parts of this system can be easily made, especially if you have access to a soldering iron, 3D printer and laser cutter (e.g. in your local FabLab ;) ).

To me, it looks like the main bottleneck is the quality of the bending tubes: how sturdy they are, and their ability to transport light.
On Thingiverse there are a number of designs to print your own modular parts of these tubes, but I wouldn't think their quality is anywhere good enough for this purpose.

So, the most interesting parts of this Adaptalux project are the bendable tubes, which they may sell separately.

Direct link | Posted on Mar 28, 2015 at 10:30 UTC
On X-Transformed? Fujifilm X30 Review article (328 comments in total)
In reply to:

basujayanta0: Where's the final score????

Blame it on your broken arm! ;)

Direct link | Posted on Mar 27, 2015 at 16:23 UTC
On Manfrotto launches miniature Lumie LED lights article (46 comments in total)
In reply to:

Fazal Majid: The 92 CRI rating suggests these use Nichia 219 LEDs, which have more accurate color rendition than the more common and powerful CREE LEDs.

I hope they don't use PWM regulation circuits to do the dimming, otherwise the resulting flicker would render them useless for high-speed applications at anything but full output.

About PWM:
the 3 and 6 light versions have 3 steps in dimming, the 8 light version has 4 steps. This suggests that they don't use PWM, but they use only a part of the LEDs.

Direct link | Posted on Mar 27, 2015 at 07:57 UTC
On Olympus OM-D E-M5 II Review preview (800 comments in total)
In reply to:

dave: In the age of cheap full frame cameras, the quarter sized sensor will always hold Olympus back. All of the bells an whistles can't makeup for the small sensor.

Exactly! I live partly in Holland, partly in Sweden. I do photography in both places. So, I need to move (most part) of my stuff up and down all the time.

I bring: 1 OM-D E-M5, 5 or 6 lenses, 2 external flashes, 1 compact tripod, 1 'tent pole' tripod, a small softbox, 1 umbrella, remote controls, batteries.
.. and this literally fits in a small bag that goes underneath an airplane chair. I never even have it out of sight.

When I travel I take a bit less gear. Rule #1: never leave your camera stuff out of sight. Try to do that with a FF system when you are in some marshrutka (mini-van) with 30 people inside.

Direct link | Posted on Mar 27, 2015 at 07:44 UTC
On Olympus OM-D E-M5 II Review preview (800 comments in total)
In reply to:

dave: In the age of cheap full frame cameras, the quarter sized sensor will always hold Olympus back. All of the bells an whistles can't makeup for the small sensor.

The cheap price doesn't make a FF camera system less bulky and heavy, especially the lenses.

Choosing a M43 system was never a price issue for me, I would choose it again, even if FF and M43 were the same price.
I do a lot of traveling; If I only had a FF camera, I wouldn't be able to take 80% of my shots.

M43 is here to stay, like it or not, simply because there is a demand for it. Maybe not for you, but for others like me.

If FF prices keep dropping I might consider using it as my 2nd camera, but I wouldn't ditch my M43 cameras.

Direct link | Posted on Mar 26, 2015 at 21:15 UTC

When you are a 'traveling photographer' you tend to carry around a lot more things than just camera gear. Therefore, a backpack dedicated to taking only camera gear isn't particularly helpful for traveling photographers. At least, in my experience.

Direct link | Posted on Mar 16, 2015 at 21:50 UTC as 25th comment | 4 replies

I read the title of this article and my 1st thought was: Iceland!!
It's so true: never, ever trust the weatherforecast, at least no forecast for more than 2-3 hours away.

Just like they experimenting with a gorilla who is active on the stock-market, and who isn't doing a much worse job than most 'financial specialists', they should do an experiment with weather-forecast-monkeys. Or for Iceland, maybe use puffins. I predict they will be exactly as trustworthy as the vedur.is or (the much used) yr.no.
No joke! :)

Direct link | Posted on Mar 11, 2015 at 15:16 UTC as 16th comment
In reply to:

Zaax: Actually I prefer crappy weather for landscape photography.

@cantanima bis
actually it's fifteen minutes. Have some patience, please!! ;)

Direct link | Posted on Mar 11, 2015 at 15:11 UTC
On Making 'Art': We go inside Sigma's lens factory article (192 comments in total)

Great article! It really helps me appreciate the amount of work and care that is put in making these lenses, not only Sigma, but in general.

It would be nice to be able to compare this production process with the Leica factory and their "handmade lenses": http://blog.leica-camera.com/leica-news/the-leica-manufacturing-process/

In what ways do these production processes actually differ?

Direct link | Posted on Mar 9, 2015 at 09:45 UTC as 76th comment | 1 reply
On World Press Photo revokes prize from Giovanni Troilo article (100 comments in total)
In reply to:

Aur: I think there is more to this story. This person diliberately misrepresented that city, lied about where the shots were taken, lied about setting things in scene.

Interestingly, Charleroi used to have coal mines, many italians used to work there decades ago, it wouldn't surprise me if this Italian photographer is in some way connected to charleroi and has some deeper unresolved problems.

More interestingly, I believe that pipeline above is associated with the mining. Also, he says "dark heart", just like coal is dark.

This whole story and his actions are just too weird, he intentionally went out to attack that city, fully aware of his narrative, I think it has nothing to do with artistic expression, but everything with his resentment towards that city.

I think it has everything to do with artistic expression, not so much with journalism.
As far as I have seen the photos in this series I like them, I like the narrative, but it's mostly an artist's view, not so much a representation of a real situation.
It's simply the wrong category.

Direct link | Posted on Mar 6, 2015 at 08:17 UTC
In reply to:

brumd: "On first use the filter needs about four hours of sunlight to create the hydrophilic characteristic"

What does that mean exactly? 4 hours of bright light on a sunny day? How long would it take on a cloudy day, for example in Iceland?
And how long does it take on second and third use?

Giklab: it says that the filter stays active for 48 hours, so they need to be "charged with UV light" everytime you intend to use them, not only before first use.

Direct link | Posted on Feb 26, 2015 at 18:15 UTC

"On first use the filter needs about four hours of sunlight to create the hydrophilic characteristic"

What does that mean exactly? 4 hours of bright light on a sunny day? How long would it take on a cloudy day, for example in Iceland?
And how long does it take on second and third use?

Direct link | Posted on Feb 26, 2015 at 17:51 UTC as 20th comment | 10 replies
In reply to:

nerd2: 85mm f3.5 portrait prime? Not interested at all.
Oh and it's priced $399... you can get the excellent nikkor 85mm 1.8G at only $50 more.

nerd2: again, you are simply not able to look beyond your own priorities. You don't HAVE to use a M4/3 system, you don't even have to like it.
But that doesn't mean that for others the M4/3 has more advantages than disadvantages to use either as their only system or as their secondary system.

It's so useless to keep screaming in every M4/3 topic how much you don't like it. We know you don't like it. You have different priorities. That's ok. Try a little open-mindedness to see why others have different priorities.
I wouldn't be able to do 80% of my shots with a FF system, simple as that.

Direct link | Posted on Feb 25, 2015 at 09:13 UTC
In reply to:

nerd2: 85mm f3.5 portrait prime? Not interested at all.
Oh and it's priced $399... you can get the excellent nikkor 85mm 1.8G at only $50 more.

First: it is not only a portrait lens. Personally, I use a 45mm lens for events/ theatre shoots. If you want to have enough DOF on a FF camera you need to stop down to 2.8 or 3.5
Second: you can shoot excellent portraits with a FF eq DOF of 3.5. Just because your style is different doesn't mean it is the only way to shoot a portrait.

Again: you have an inability to look beyond what ÝOUR priority is. M4/3 users KNOW they gain extra DOF when using their lens wide open (it's a feature not a disadvantage, for others).

If m4/3 is not your thing: that's fine. But try to have an open-minded for people with different priorities. m4/3 users KNOW this is not the system to achieve the shallowest DOF. You need Medium Format for that.

Direct link | Posted on Feb 24, 2015 at 23:24 UTC
Total: 72, showing: 1 – 20
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