Photography Weekly Newsletter - Wednesday, October 28, 2015

Top new questions this week: Why is infrared light's focus point different from that of visible light? When reading about infrared photography, it's often mentioned that IR's focus point is slightly different from visible light. Why is the focus point of infrared light point different from the focus ... [focus] [optics] [light] [infrared]   asked by Goldorak84 21 votes answered by Michael Clark 27 votes This semicircular white plastic clip came with a lightstand: what is it? I ordered a cheap 9' light stand from Adorama, and in the box, just loose, was this weird clip: I don't see it in the manual or on the product photos online It's a white plastic partial circle, a ... [lightstands]   asked by mattdm 8 votes answered by null 11 votes Can I make commercial use of an image which is readily available but with unclear licensing? I found a desktop wallpaper on the web that i would like to use for commercial work. I am interested in using about 30% of this image, but I am not sure if it is legal. I googled a lot and there is ... [legal] [copyright] [licensing]   asked by sharkyenergy 7 votes answered by Philip Kendall 41 votes Could my camera been damaged if it was shipped without packing materials? Amazon shipped me a camera like this: just in the manufacture's box with no extra padding in the shipping box. Should I be concerned that it may have been damaged in shipping? Cosmetically it looks ... [equipment-damage] [compact-cameras]   asked by Walter Stabosz 3 votes answered by mattdm 6 votes How can I know what is ideally neutral in a picture, in order to set white balance? According to my understanding white balance is procedure that removes effect of colorful lengthening. It makes picture like it was lightened with ideal white color light. Please, correct me if I'm ... [white-balance]   asked by vico 3 votes answered by MikeW 3 votes What kind of lens to use to get sharp images of people from a distance? I am looking to buy a new lens and want something that will produce sharp images of people from a distance. I currently have a 50mm prime lens and my close-up portraits are great - crisp and clear - ... [lens] [portrait] [sharpness] [subject-distance]   asked by Jennifer 3 votes answered by dpollitt 1 vote Can I Watermark An Image With Its Filename and Copy name when exporting from Lightroom? I'd like to send a variety of versions of the same image to a lab to look at differences in stock, contrast and sharpening. I know I'll be able to tell the difference in stock by the information on ... [lightroom] [printing] [prints] [filenames] [watermark]   asked by Pedr 3 votes answered by Christian 2 votes Greatest hits from previous weeks: So my iPhone 6 camera lens is as wide as my full frame 35mm DSLR lens? I am trying to understand what is the deal with "full-frame" and what difference it makes, so did a silly test: I sat at my bed and aligned the iPhone 6 camera with the door of the room and took a ... [lens] [focal-length] [full-frame] [sensor-size] [field-of-view]   asked by user1899082 1 vote answered by mattdm 18 votes Is it possible to increase scale up an image to increase the the pixel density? I have taken a picture whose resolution is less. I can resize the image easily (i.e I can scale to higher resolution) but the image quality goes for a toss, which is true because the image might not ... [post-processing] [resolution] [pixels] [rescaling]   asked by sat 9 votes answered by Matt Grum 10 votes Can you answer these? Canon 6D Auto Focus Erratic Behavior I have a 2 year old Canon 6D which I use primarily for landscape photography and taking shots of my grandkids. It exhibits a strange behavior at times when I lift it to my eye to compose a shot. ... [autofocus] [canon-6d]   asked by RWM1701 1 vote How do I figure out, which lens(es) of what diameter(s) in which distance(s to each other) to use? My goal is to put a lens or an array of lenses in front of my actioncam to use it's high resolution for recording of undistorted normal-eyed footage to avoid having to buy two cameras for the ... [lens] [optics] [lens-design] [lens-adapter] [software-recommendation]   asked by Vitalis Hommel 1 vote How to keep burnt-out regions from becoming strongly blue and purple in Rawtherapee? I am getting the following very unpleasant visual effect from a party picture I am trying to post-process in RawTherapee. Basically, I would like to have the regions where the lights pointed to look ... [post-processing] [highlights] [saturation] [rawtherapee] [highlight-recovery]   asked by TheChymera 1 vote

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