Time to be with your loved ones

Time to be with loved ones

by sat

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2,400 reputation
1816
bio website
location Norway
age
visits member for 2 years, 11 months
seen Mar 26 at 17:06

Hobbyist photographer back in the '70s and '80s. Took my first photo when I was five years old, got an SLR when I was ten. (Film, all manual, handheld light meter, we had a darkroom in the basement.)
Shelved the hobby for a couple of decades. Returned recently, this time with digital equipment.

Jack of many trades (I think "all" is slightly overstating my case :) and master of none, but I have a master's degree in computer science/pattern matching/AI and a professional background in software development.


Jul
9
comment What do the markings on a Tamron CCTV lens mean?
@Mzk 1) Formula for f-number is the same, independent of DSLR or CCTV. 2) Some DSLR lenses cannot change aperture directly on the lens, only indirectly from the camera. But 3) it appears that the manual iris and auto iris specifications are for two different lens models - one manual, one auto. So I guess yours is the auto iris model. See their catalog (pdf) - one auto, one manual iris version of each lens.
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
8
answered How weather resistant is the Canon EOS 7D?
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 extreme (multiple month!) long exposure photos?
Jun
30
comment How to take extreme (multiple month!) long 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 extreme (multiple month!) long 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?