Lunch atop a (Springfield) skyscraper

Lunch atop a (Springfield) skyscraper
by andy-m                

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  • 0 posts edited
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Jul
9
comment What do the markings on a Tamron CCTV lens mean?
@Mzk You have the lens, why don't you try and see? For DSLRs, some lenses change max aperture (the f-number) as you zoom, other lenses keep it constant. To keep it constant, the lens has to change the effective diameter when zooming. 'F 1.4-Close' certainly means that max apt. is f/1.4. I can't tell from the specification whether that's a constant f/1.4 through the zoom range.
Jul
9
comment What do the markings on a Tamron CCTV lens mean?
@Mzk The f-numbers is what is listed in the specification as 'aperture range'. Yes, the effective diameter needs to change when the focal length changes to retain the same f-number. Either the lens does that automatically, or the f-number changes when you zoom. Not familiar with CCTV, but assume aperture works like for DSLR lenses: An iris like the 'nine-bladed iris' animation here: en.wikipedia.org/wiki/Diaphragm_(optics) that can step through the standard progression of f-numbers from your link - 1.4, 2.0, 2.8 etc.
Jul
9
comment What do the markings on a Tamron CCTV lens mean?
@MizukiKai I guess 'close' means that the iris can be closed completely, so there's no light coming through at all. If so, I assume all the intermediate apertures are available as well.
Jul
6
comment Birding on a budget?
What's wrong with leaving the question as is? It's got three good answers for three different budgets: Bridge camera, Sigma Bigma and 70-200/2.8 with 2x TC. Don't they collectively cover pretty much the entire space of what 'budget' could mean? For future visitors through Google, aren't these good answers to "I'm not a millionaire, but I'd like to shoot birds - what are my options"?
Jul
3
awarded  Fanatic
Jul
3
awarded  Enlightened
Jul
2
awarded  Nice Answer
Jul
1
comment Is there a program that does automatic adjustment of levels in a batch?
Both Google's Picasa and Adobe Lightroom have an 'auto' option. In Lightroom, at least, you can apply it in bulk. For some photos it works very well, for others it's just awful. Automatic good settings for every picture is not feasible, IMO, but it can save editing time for the pictures where it works.
Jul
1
comment What do I need to take photos which accurately show small differences in color?
@JamesSnell I guess it should work if you use consistent lighting. Haven't tried, so I can't really comment beyond that. But you might want one anyway to calibrate the monitor.
Jun
30
answered How to take extremely long (multiple month) exposure photos?
Jun
30
comment How to take extremely long (multiple month) exposure photos?
@StanRogers You're right, I was off by a couple of stops; thanks for catching it. Do you happen to know how low-sensitivity it's possible to make these plates, is there a minimum? (Agree on the reciprocity failure. Found a "simple model for t>1 second" here, I assume that's for the same development. Brings the number of stops of ND down to a reasonable range.)
Jun
29
comment How to take extremely long (multiple month) exposure photos?
Don't know the parameters of a 4x5 camera. But assuming a flange distance of 100mm and optimal pinhole size from the wikipedia formula giving ~f/256, and ISO 25 film, I'm still only at 4 seconds exposure in EV 14 daylight. I think you would need 24 stops or so worth of ND-filters...
Jun
28
revised What do I need to take photos which accurately show small differences in color?
Generalized the answer so it's more applicable to normal photography as well.
Jun
28
comment What do I need to take photos which accurately show small differences in color?
My answer was on the assumption that you had both colors/shades in the same picture, and needed a way to tell them apart. If you are comparing across two different pictures, I'd start with mattdm's suggestion.
Jun
28
answered What do I need to take photos which accurately show small differences in color?
Jun
26
answered Are there any ways to combat “sluggish battery syndrome”?
Jun
22
revised How effective is HAMA STAR 61 tripod for shooting with Nikon DSLR?
spelling, more general conclusion
Jun
21
answered How effective is HAMA STAR 61 tripod for shooting with Nikon DSLR?
Jun
21
comment How effective is HAMA STAR 61 tripod for shooting with Nikon DSLR?
I have the Hama Star 62, see my comment to Esa Paulasto. It's better than handholding, but it takes some care and patience to keep it steady. OK with short focal lengths and a remote release. OK if you're just trying to figure out whether you want a tripod at all. But if you're planning to use it quite a bit, I'd suggest finding something more stable.
Jun
21
comment How effective is HAMA STAR 61 tripod for shooting with Nikon DSLR?
+1, since that's pretty much exactly my experience with the Hama Star 62. The legs are decent, I think, but the head is so wobbly that it's hard to focus a 300mm on the moon, and a 2 seconds delay isn't nearly enough for the shaking do die down. Still, with care, holding my breath, and a remote release, it beats handholding. Although I'll be looking for a tripod upgrade very soon.