Serene Life

by garik

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226 reputation
29
bio website jstarek.de
location Germany
age
visits member for 3 years
seen Oct 13 at 13:17

Work

  • Member of the Scientific Computing group, DESY, Germany
  • Java, databases, unix-y stuff in a large-scale scientific computing facility

Hobby

  • Restoring Germany's oldest radio telescope, the Stockert 25 meter dish
  • Learning radio astronomy and high-frequency electronics
  • Design, construction and operation of the observatory's Linux network and scientific workstations

Oct
6
accepted Converting cameras for infrared use: When does the filter have to be replaced, and when is simply removing it ok?
Oct
3
comment Converting cameras for infrared use: When does the filter have to be replaced, and when is simply removing it ok?
Just some anecdotal evidence: Today I tried modifying an old bridge camera by completely removing the filter. Afterwards, focus is a very slight bit worse than before the modification, but the effect is only noticeable in dedicated test setups. Contrast-based AF seems to "pump" a bit more than before but locks on reliably.
Oct
3
comment Converting cameras for infrared use: When does the filter have to be replaced, and when is simply removing it ok?
Thanks for your reply. Since you only talk about phase-detection AF systems, what about contrast-based ones?
Oct
2
awarded  Yearling
Oct
2
asked Converting cameras for infrared use: When does the filter have to be replaced, and when is simply removing it ok?
Sep
29
comment Are there any tetherable compact cameras?
Ah, sorry, I read "compact" as an adjective here since I thought it would have been capitalized if it was meant to denote a device class.
Sep
29
answered Are there any tetherable compact cameras?
Sep
24
awarded  Autobiographer
Jul
15
revised Why are lenses always round in shape?
Spelling and grammar corrections
Jul
15
suggested suggested edit on Why are lenses always round in shape?
Aug
10
revised Is there any filter opposite to Polarizing filter, to emphasize reflections?
Some spelling and grammar, but most importantly: glass -> glare (which gives the question a whole new meaning ;-))
Aug
10
suggested suggested edit on Is there any filter opposite to Polarizing filter, to emphasize reflections?
Feb
15
awarded  Enlightened
Feb
15
awarded  Nice Answer
Feb
8
comment What kind of camera do I need to capture deep space images?
Today, on universetoday.com, there was a link to an image that is probably among the very best possible without digital alterations: flickr.com/photos/67234957@N06/6308631822/in/… clearly shows the milky way's central structures and was taken with a Canon 550d at 25 second exposure at 17mm, f3.5, ISO 3200. The electricity pole (lower right in the image) hints that the photographer was not too far in the wilderness. Note the "trick" with the hilly horizon: This removes a lot of possible light pollution from your immediate zenith view.
Feb
7
awarded  Teacher
Feb
7
revised What kind of camera do I need to capture deep space images?
added 524 characters in body
Feb
7
answered What kind of camera do I need to capture deep space images?
Oct
26
awarded  Scholar
Oct
26
awarded  Benefactor