Alley in Pisa, Italy

by Lars Kotthoff

submit your photo


Hall of Fame
View past winners from this year

Please participate in Meta
and help us grow.

90,862 reputation
3187330
bio website mattgrum.com
location
age
visits member for 3 years, 10 months
seen 1 min ago

Jun
27
comment If TTL only preflashes once, how does it get correct exposure immediately after?
The short answer is that it's pretty dumb and gets it wrong on a regular basis! If you shoot somebody in a high vis jacket, it sees the flash bounce straight back off one of the reflecting strips, thinks "wow there's a lot of flash coming back, I don't need much power at all" and then ends up massively underexposing the photo.
Jun
27
answered Using a set formula to measure distance in a photo but the answers are coming out much smaller than expected?
Jun
27
revised Using a set formula to measure distance in a photo but the answers are coming out much smaller than expected?
deleted 4 characters in body
Jun
27
comment How does an octobox differ from a rectangular softbox?
@Boris_yo unless you are shooting in complete darkness, with the lamp as the only source of light then a desk lamp will be nowhere near bright enough to light up most softboxes.
Jun
27
comment What causes longitudinal chromatic aberration on Nikon 50mm f/1.4D?
@PicturePerformer that link is referring to the much easier to correct lateral chromatic aberration. Longitudinal chromatic aberration is very difficult to correct in software as it happens either side of the plane of focus, but the software has no idea where the plane of focus is!
Jun
26
awarded  Enlightened
Jun
26
awarded  Nice Answer
Jun
26
answered If it's not a 100% crop, what is it?
Jun
24
comment Fixing chromatic aberration automatically with software
Plain old lateral chromatic aberration is independent of lighting, so an automatically generated profile could be applied to all images. Things like purple fringing of highlights is different and depends on lighting.
Jun
24
awarded  Nice Answer
Jun
23
comment I am looking for a 2X extender for a Canon 100mm EF 2.8 (non L series)
You'll also increase the maximum magnification by 2x, which can be handy for a macro lens. If the use case is just to gain reach then the same money would be better spent on a longer lens.
Jun
23
comment I am looking for a 2X extender for a Canon 100mm EF 2.8 (non L series)
Are you looking to use the extender (teleconverter) to increase macro magnification, or to use the lens as a 200mm telephoto at normal focus distances?
Jun
21
comment Techniques used in long exposure in a forest
The question was what techniques were used for that particular shoot, not how to get a nice photo of a tree. Colour slide film had terrible DR and wouldn't get you anywhere near. As I said in the comment above you need a tree (goes without saying that the tree should not be miles away), the sun in the right place and Photoshop
Jun
21
comment Is there a situation in which taking exposure bracketed photos at only the widest separation (±3EV) doesn't work?
Bracketing features predate HDR by many decades and were originally designed to help with camera metering problems, even now it's all a useful feature to get the exposure spot on, hence the +-1 EV options do make sense whilst possibly being overkill for HDR
Jun
20
comment Techniques used in long exposure in a forest
Getting images like that is more about processing than you might think. Yes you need a tree, and the sun needs to be shining and not directly overhead, but having looked at all images on the original post they all have very clear signs of processing. Saying all you need is to find the right surroundings or weather is a bit misleading.
Jun
20
revised Techniques used in long exposure in a forest
added 276 characters in body
Jun
20
answered Is there a situation in which taking exposure bracketed photos at only the widest separation (±3EV) doesn't work?
Jun
20
answered Techniques used in long exposure in a forest
Jun
20
answered Is it possible to take a long exposure photograph during daytime?
Jun
19
comment Long exposure photoshop?
My personal opinion is not to bother, it wont look right without a lot of skill/time, and a crisp water shot will look better than a cheesy photoshop attempt. Next time you're stuck without an ND filter, stop down to get the shutter time as slow as you can and take a long series of images and stack them when you get home.