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22,893 reputation
466127
bio website 365project.org/imrelumiste
location Finland
age 35
visits member for 3 years, 9 months
seen 2 hours ago

Feb
12
comment DIY Vignette Measuring
A cloudy sky outdoors should act as a softbox big enough for lighting evenly any reasonable sized even surface you might want to use for your tests as long as there are no nearby objects casting their shine or shadow upon the area.
Feb
7
comment What are practical advantages of Compact cameras over DSLR?
Background blur is harder to achieve with compacts, but it can be done, especially in close range as in the example here. Near macro, the deeper DOF might even be an advantage. And a DSLR can be shot with the inevitable backup DSLR :)
Jan
30
comment What is the purpose of a dual LED flash?
@drfrogsplat Thanks for the hint, edited.
Jan
29
comment How do I determine the actual calibrated specifications of a Holga?
Not sure about correctness of such measurements, aren't the light rays already concentrated at the described locations? Given the measurement logic in linked article, e.g. 200mm f/2.8 lens would be physically impossible for any 35mm mount since there isn't enough room in camera for fitting a 71mm light pole. Instead, the effective aperture, i.e. how big the aperture looks from front side of lens, should be measured.
Jan
27
comment What is the difference Focus mode and AF-Area mode?
Auto Area AF seems to imply face detection according to Nikon's materials
Jan
21
comment Why aren't devices with two cameras more popular?
The parallax difference should be around couple of pixels for an object at 3 meters (10 feet). Yes, the dual camera could be added to a popular smartphone. Will the effort be taken just to get ~1 EV extra low light performance (the only application appealing to wider audience)? Sounds unlikely.
Jan
19
comment Where can I find a canonical list of the latest firmware for Canon cameras?
@Hugo Note that the list covers recent updates, not just recent models, so even if the 1Ds were to be updated, it should appear there.
Jan
10
comment Will Canon Cameras fit all Canon lenses?
What about EF-M lenses?
Jan
8
comment What can I do about Pentax superzoom 18-270 autofocus problems?
Have you tested with any other lenses to make sure that the camera body is not the faulty part?
Jan
5
comment Do bigger focal lengths capture more light?
Even the kit lens has an increasing aperture (especially if you consider kit lenses with longer zoom ranges, e.g 18-135), it just increases somewhat slower than focal length. It should be mentioned though that it's the effective aperture discussed here; physically, the blades are placed on the optical path somewhere where the light rays are condensed (otherwise there would be no room for aperture blades when they are fully open). In variable aperture zooms, the width of rays at aperture depends on zoom; in fixed aperture lenses, it doesn't.
Jan
3
comment How to calculate the optimal pinhole size?
@MattGrum if you could describe how increasing/decreasing hole size affects those properties, that'd be awesome (and also an answer to what I'm asking here)
Jan
3
comment How to calculate the optimal pinhole size?
All figures should be in same units as you want the result in (mm seems to be most common; 550 nm = 0.00055 mm)
Jan
2
comment What can a fisheye lens be useful for?
Wow! These examples were worth asking for.
Dec
31
comment Can I manual adjust focus after half shutter press?
Yes. The focusing ring on STM lenses works "fly-by-wire", so you can't cause any mechanical damage by turning it.
Dec
27
comment What can a fisheye lens be useful for?
The example link has rotten, could you add the example directly to the post?
Dec
11
comment What is the difference between Nikkor D type and G type lenses?
The D and G letters are really about aperture ring, not about presence of auto-focus motor; AF-S and AF-I lenses have the motor and AF lenses don't.
Dec
8
comment What is the technical name for a zoom lens which has a fixed maximum aperture?
FYI, Pentax Reflex Zoom 400-600mm f/8-12 is a fixed (but not constant) aperture zoom lens
Nov
21
comment Can I revert 'Color Sketch' mode on a Nikon camera?
If JPEG is all you've got, converting to black and white might relieve the effect somewhat - not completely undoing, but at least somewhat hiding the processing.
Nov
21
comment Does Canon make an L series lens with a plastic lens mount?
Pentax does have some lenses (18-55, 55-200, 55-300) that come with plastic mount in kits (the "DA L" - L as in Light - version), and metal mounts ("DA") when purchased separately.
Nov
7
comment How can I photograph welding?
@PengTuckKwok True, ND filters will provide the exposure correction as well, but filters in general are prone to cause ghost reflections when pointed to light sources, especially when stacked, so they are an inferior solution when the light source is the main subject.