Photography Weekly Newsletter - Wednesday, July 30, 2014

Top new questions this week: Can anyone identify the manufacturer of this golden lens? On a recent photo tour, a lens another photographer used caught my attention because of its golden color and no manufacturer name I know being visible. Unfortunately, I was busy taking some shots … [lens]   asked by Helm Hammerhand 12 votes answered by Matt Grum 14 votes How can Walter Mitty examine the negatives of photos in the bright sunny day? This may be a naive question, as I am not familiar with photography using negatives storing the photo images. So in the film of "The Secret Life of Walter Mitty", Walter Mitty examines the negatives … [technique] [film] [equipment-protection] [negative] [movie]   asked by Idear 9 votes answered by MikeW 28 votes Why did this photo of the Milky Way turn out badly? I followed these instructions and written down the steps I understood to be important, that is: shutter speed = 600 / focal length * crop factor (1.5 for APS-C sensors) ISO = 6000 * f-stop^2 / … [astrophotography] [milky-way]   asked by user1653963 7 votes answered by Count Iblis 10 votes Why are gels used for digital photography? What is the purpose of color-adjusting light sources with gels in digital photography? Are they reserved exclusively for scenarios in which one wants different colors from different lights? I assume … [color-correction] [color-filters] [gels]   asked by feetwet 4 votes answered by John Thomas 5 votes Use of DOF adapters in stills photography The camcorder guys figured out long ago how you can get the shallow DOF of a larger sensor system (typically full frame) on a camcorder equipped with a much smaller sensor (typically 1/2.8") by doing … [lens] [depth-of-field] [optics] [medium-format] [large-format]   asked by ziutek 4 votes answered by Matt Grum 6 votes Why are Micro Four Thirds lenses so expensive compared to Canon? I'm looking at picking up a new prime portrait lens to augment the kit lenses that came with my Olympus OM-D M-10. My brother has a Canon with a 50mm f/1.8 lens that takes beautiful photos and costs … [lens] [canon] [pricing] [micro-four-thirds]   asked by James Davies 4 votes answered by mattdm 14 votes What effects do different flash diffuser shapes have? Looking for a flash diffuser I stumbled upon this: Polaroid Universal Flash Diffuser The link is to an Amazon page where you can choose from a wide range of shapes and types, but for the purpose of … [flash] [diffusers]   asked by CLockeWork 3 votes answered by Jan 'Saffi' Stekelgunsson 5 votes Greatest hits from previous weeks: How do I calculate the distance of an object in a photo? If I took a picture of a windmill on the horizon — given that I know the sensor size and the focal length of the lens and other factors to do with the shot — could I calculate how far away an object … [focal-length] [subject-distance]   asked by Rob 20 votes answered by Matt Grum 21 votes How do I select all pixels that match an exact color value in Adobe Photoshop? Is there any way to select all pixels on the current layer that match a specific color value exactly? My first instinct is Select > Color Range..., but I cannot determine how to input a specific … [photoshop] [color]   asked by Unsigned 9 votes answered by Sean 7 votes Can you answer these? How to get widht and height of the image based on distance I have an app to overlay the images on the camera overlay. But i need to set the width and height of the image based on the user distance. If say 8feet means, how can i calculate the width and heigth … [focal-length] [sensor-size] [magnification] [focus-distance]   asked by karthees 1 vote How to overlay the image scaling based on the user distance & focal length I'm overlaying images on the cameraView and based on the user input of room width & height. The images are displaying proportionally to width & height ratio. but i need to overlay the images … [focal-length] [sensor-size]   asked by karthees 1 vote want to use Panasonic lumix dmc sz1 as cam attached from my computer I have the cam as mentioned in title but cannot attach and use the cam from computer. That is i want live feed of what the camera is seeing on the computer screen for clay stop motion animation. Also … [camera-basics]   asked by user31343 1 vote

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