All Forum Comments
Comment by hefty1 posted on Your Most Exotic Lens at 07/07/2009 - 00:33
Comment by hefty1 posted on To grip or not to grip at 07/07/2009 - 00:03
Comment by hefty1 posted on To grip or not to grip at 06/07/2009 - 23:58
Comment by hefty1 posted on Object Still Life at 06/07/2009 - 00:14
I've used some fairly expensive mail order places and Snappy Snaps have proved better than all of them. Shame they won't touch 120 film or I'd use them exclusively tbh.
Comment by hefty1 posted on What is the best Pentax 35mm film SLR? at 03/07/2009 - 01:03
Comment by hefty1 posted on What is the best Pentax 35mm film SLR? at 02/07/2009 - 21:26
What of my original question? Is it possible to continue to use the lens without contaminating the camera body?
The fungal spores are already inside your camera body, they're inside every lens you own and they're part of the air you breathe day-in and day-out.
Under normal circumstances they will remain dormant and invisible, they'll only cause damage under specific conditions (warm, dark, damp as a rule). What you see on the lens isn't the fungus itself, rather the trail left behind by it.
The fungus eats the nutrients inside your lens (hence it's more prevalent in older lenses where he elements are stuck together with Canada Balsam rather than today's synthetic adhesives which most fungi find unpalatable), it then secretes an acid as it moves along the lens surface. The acid chemically etches the coatings on the lens and it is this that makes up the "spider's web" that you can actually see.
You can kill fungus with prolonged exposure to UV light but it's hard to know whether the job's been effective or not. If the "web" isn't growing over a period of time it's pretty safe to assume the fungus is dormant so I'd only bother with cleaning if it made an appreciable effect on image quality.
To stop further outbreaks you just need to make sure your lenses are kept dry, cool and ventilated when they're not in use.
Comment by hefty1 posted on Fungus problem on SMC 75-150. Advice please. at 02/07/2009 - 19:38
Comment by hefty1 posted on Size of K100D focus screeen question at 30/06/2009 - 22:17
Thanks, for answering. It confirms my thoughts on that. The exposure problems occurring with the K10D/20D are screen related when using NON A lenses.
Martin.
This is also borne out by my own observations that slower non-A lenses (f/3.5 and below) don't give the same problems metering as the faster ones, even using the standard K10D screen. The camera almost certainly applies some form of compensation when a fast "A" lens is attached as it will know what the maximum aperture is - perhaps if there was a way to manually input aperture in the same way we input focal length then the problem would be solved, one for the next generation maybe?
Given that the majority of DSLR owners probably don't have much beyond the kit lenses then I think Pentax is wise to bias the metering to their advantage, however, it would be nice if Pentax made an uncoated screen as an option for those wishing to use (fast!) old glass.
Comment by hefty1 posted on Size of K100D focus screeen question at 30/06/2009 - 16:59


The only piece of non-existant Pentax exotica I could see me hankering after would be a tilt/shift lens, if one of those was introduced then I'd be sorely tempted I reckon...
Other than that I'd quite like to see a DA135/3.5 in the style of my Sonnar, but Pentax covers pretty much all the bases I'm likely to want or need so I'm contented.