Alley in Pisa, Italy

by Lars Kotthoff

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bio website imaginaryindustries.com
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visits member for 3 years, 7 months
seen 5 hours ago

Grumpy.


Apr
18
comment Is it possible to make an image which is only photographable in black or white?
@TFuto - Arguably, the retina can be considered part of the "brain". It varies by neuroscientist.
Apr
13
answered What is the MECHA DEVICE SERVICE in the Sony Alpha 7
Apr
13
comment What is the MECHA DEVICE SERVICE in the Sony Alpha 7
I would assume that it's "mechanical device service", and probably just an internal code for tracking the cost of the labor to do the service.
Mar
17
awarded  Notable Question
Dec
11
awarded  Yearling
Dec
1
comment Is this statement By Jim Zuckerman incorrect?
I'd be a smart-ass and point out that there are electronic shutter systems that are in fact fast enough that they can trigger in the time it takes light to travel to a subject a few meters away from the camera and back, but that's primarily just snark.
Dec
1
comment What is the benefit of the sensor marker?
To answer your second question. It's the same marker pretty much everywhere, and it's on all serious cameras of any make (including Nikon, etc...).
Sep
20
comment How can I completely avoid noise for stock photography with my Canon 650D?
What ISO are you shooting at? Can you post a example picture? Having at lease some noise is normal, it's a inherent part of the way the image sensor works.
Sep
11
comment If you are shooting a movie/photo (non-profit or profit) with a willing person, should you get a contract signed from him/her?
This is not true, at least in America. If you're in public, you do not have the expectation of privacy, and as such, people can photograph you as they please. A model release is still a good idea, as a specious lawsuit repellent, if nothing else, but nevertheless.
Sep
5
comment Why do I have blurry star trails?
Honestly, I think the issue here is probably that the OP has long-exposure noise-reduction on, so the camera is taking a dark-frame the length of the exposure every shot. Since the OP says he's taking 30 second exposures, that's a 30 second gap between every shot.
Sep
5
comment Why do I have blurry star trails?
A light trail is effectively a large number of short-duration shots stacked. The issue the OP is having isn't due to the fact that he's stacking short exposures, it's that he has too large an interval between the short exposures. This could be fixed by either taking longer exposures, or simply taking images more rapidly, to the point where the individual points from each exposure fully blend together.
Sep
5
comment Why do I have blurry star trails?
You can effect a synthetic long-exposure by stacking many shorter, sequential exposures. I don't see this as being an issue.
Aug
9
answered How are very high resolution images displayed on low resolution monitors?
Jul
27
comment What does STM mean on a Canon lens?
Stepper motors are a specific type of AC servo motor, As such, they're really not a DC motor. Additionally, DC motors can be made as or more precise then a stepper. The functional precision of a servo system is merely a product of the specific implementation, so saying a stepper motor is a "more precise" version of a DC motor is an over-generalization, in addition to being incorrect about the DC part.
Jul
25
comment How to fix inoperative autofocus in Canon 70-200 F4 L USM?
If it's focus-by-wire, the problem is almost certainly in the electronics. This is unfortunate, as the electronics are much less repairable. I think your best bet would be to disassemble the lens, and check for loose connections. If you don't find any (it's a pretty unlikely failure mode), I think your only hope is to send it to canon, and let them fix it.
Jul
25
comment How to fix inoperative autofocus in Canon 70-200 F4 L USM?
There are a few images showing partial disassembly of that lens here: pbase.com/bigflat/ef_200mm_f18l_disassembly . It is intended for showing how to clean the internal elements of the lens, but it includes removing the focusing cell, which it likely the part of the lens that is stuck in some manner (The problem is probably in the helicoid). How does the focusing-ring feel? Does it feel stuck, or does it feel like it's no longer connected to anything?
Jul
25
comment How to fix inoperative autofocus in Canon 70-200 F4 L USM?
@SkippyFastol - Whooo boy, I don't know if I'd feel comfortable taking a $6K lens apart. Anyways, the fact that manual focus doesn't work is actually a good thing. It means the issue with the lens is mechanical, rather then electronic. (Assuming this lens has full-time-manual-focus (I'm pretty sure it does)). Does the lens communicate with a camera properly, and does the iris work?
Jul
25
comment Why do Canon lenses stay wide open when off camera, but Nikkor lenses keep tight aperture?
It's worth noting that if you stop down a Canon lens, and then remove it from the camera body while stopped down, the iris stays at whatever f-stop it was at when you removed it. This fact is actually commonly exploited for setting the aperture on canon lenses when being used in non-electronic adapter mounts.
Jul
2
awarded  Popular Question
May
22
comment How many “MegaPixels” can the human eye see?
Source on that 576 mp number?