All Forum Comments
Comment by johnriley posted on K Mount lens at 07/07/2008 - 11:55
What are the specific details of the lens? This information will enable a proper reply.
Comment by johnriley posted on K Mount lens at 07/07/2008 - 11:39
Another great competition, well judged and now will our winner please step forward to the "podium" and set the next theme!
Comment by johnriley posted on Weekly competition#53: The pleasure of summer holiday. at 14/07/2008 - 07:44
Summer on the beach at St Malo:
Comment by johnriley posted on Weekly competition#53: The pleasure of summer holiday. at 13/07/2008 - 11:50
Yep, just take some pictures and relax...
Comment by johnriley posted on Expected lifetime of a digital camera... at 04/07/2008 - 22:21
Interesting question. We know the shutters are rated at about 100,000 exposures or more, but how about the CCD.
As the photo sensitive sites are photo diodes I would guess that the life expectancy might be similar to that of say a LED, another form of diode. That might be 10,000 continuous hours, so at 1/60 second per exposure that makes 600,000 exposures if my shaky maths is correct.
If that's anywhere near a viable guess then I think the camera will be upgraded well before then...
As the photo sensitive sites are photo diodes I would guess that the life expectancy might be similar to that of say a LED, another form of diode. That might be 10,000 continuous hours, so at 1/60 second per exposure that makes 600,000 exposures if my shaky maths is correct.
If that's anywhere near a viable guess then I think the camera will be upgraded well before then...
Comment by johnriley posted on Expected lifetime of a digital camera... at 04/07/2008 - 21:56
You get your voltmeter, place the two contacts on the flash hotshoe contacts and fire a test flash. Try it a few times until you are happy that you have a reliable result.
Comment by johnriley posted on Safe use of older flash guns at 07/07/2008 - 16:11
Be cautious with older 1970s flash guuns, some of which have trigger voltages approaching 300V. Idential looking Vivitar 283's for example can vary from 28V to 290V, so obviously there were different versions made.
The only safe thing to do is to measure the voltage with a meter.
The only safe thing to do is to measure the voltage with a meter.
Comment by johnriley posted on Safe use of older flash guns at 04/07/2008 - 22:03
Then the lens can be used in manual exposure mode with stop down metering and operation. In other words, you need to stop the lens down with the stop down lever around the shutter button, or using the green button on the camera back.
If you set the camera to anything else it will operate in Av mode and shoot at open aperture all the time, but the shutter speed will vary automatically.
The subject has been covered quite extensively in this forum, so using the search facility should bring up lts of information.
Hope that helps!