All Forum Comments

Comment by johnriley posted on Bill Ward wows ADAPS at 26/01/2018 - 00:13
Comment by johnriley posted on Website glitches at 25/01/2018 - 23:35
Although I'm not sure why I'm furthering the merits of any TV material, we'd really rather be out shooting pictures.
Comment by johnriley posted on Another pointless thread at 25/01/2018 - 09:40
Comment by johnriley posted on Another pointless thread at 24/01/2018 - 22:21
Comment by johnriley posted on Pentax's Position in DSLR sales at 24/01/2018 - 18:23
Comment by johnriley posted on Pentax's Position in DSLR sales at 24/01/2018 - 16:32
Comment by johnriley posted on Pentax's Position in DSLR sales at 24/01/2018 - 09:30
Comment by johnriley posted on Pentax's Position in DSLR sales at 23/01/2018 - 23:49
Please try to avoid the temptation of replying and sooner or later the spammer will be neatly swept away........
Comment by johnriley posted on DIY Ring Light Adapter for reversed lens at 22/01/2018 - 15:29
Almost all filter effects can be done in Photoshop, but with film obviously we need to use something physical to get the desired resuts. So, with black and white film blue skies tend to look bland and adding a yellow, orange or red filter gives darker blues and more dramatic cloud formations. With colour film you might want to reduce the blue in mountain scenes, so a UV or Skylight filter will do that. If you want to warm the image then an 81A is a good place to start.
Now polarisers are unique in that they affect the polarisation of incoming light, something that can't be added in Photoshop. They will darken blue skies, intensify colours and reduce reflections from water, but it will depend on the light at the time. They are potentially useful, not essential by any means, but don't use one permanently as you will also lose 2.5 stops or so of light and that will mean slower shutter speeds and more danger of camera shake.
There are plenty of books and YouTube videos about filters, and some research would be a good idea before deciding what to buy.
Comment by johnriley posted on Super taumar polarising filter at 21/01/2018 - 10:15

