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johnriley

Joined: 19th March 2002

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johnriley
I prefer to adjust my BW conversions using Channel Mixer.

Comment by johnriley posted on Snowy Tryfan in B&W at 11/09/2008 - 16:24

johnriley
The whole point of this section is that people can post photos....

Comment by johnriley posted on Outback SA at 10/09/2008 - 17:27

johnriley
The safest thing is more SD cards. In the unlikely event that one becomes corrupted then the others will still be safe.

All electronic devices can fail and I would hate to have all my images on a laptop or anything else for it to blow up, or even get stolen.

Comment by johnriley posted on storage on the go/digital viewers at 10/09/2008 - 14:49

johnriley
You can use it on your DSLR with the Adapter K...but I doubt that it would be worth the hassle!

Comment by johnriley posted on Count those milliseconds! at 10/09/2008 - 07:46

johnriley
Schacht made lenses for several camera manufacturers. I wonder what lens mount it is? The Travenon and, I think, Travenar lenses were lower cost options, but no doubt well made. It may well be a simple 3 element design.

Comment by johnriley posted on Count those milliseconds! at 09/09/2008 - 23:20

johnriley
Perhaps the clear clean air helps vision as well?

Comment by johnriley posted on Pictures from Caithness at 09/09/2008 - 22:20

johnriley
Whilst we're sort of on the subject of how things have changed (generally for the better IMHO) the same Voigtlander Bessamatic had a superb series of lenses.

But just imagine a 135mm lens than cannot focus closer than 13 feet....it was indeed a very different world for the photographer.

Where the bessamatic does score is not in handling speed but in the sheer joy of its superb mechanical quality and finish. The chrome body finish has to be seen to be believed. I had one in as-new condition once and it was just a beautiful object.

The Pentax Spotmatic was however streets ahead if the objective was to take photographs and around half the price as well. Which is why the German photographic products became a niche market.

Comment by johnriley posted on Count those milliseconds! at 09/09/2008 - 22:18

johnriley
Quote:
so the only delay was in the actual release mechanism.
Ah, I was talking about the Compur-shutter SLRs and forgive me for not explaining a little further.

A compur shutter is an iris like the one in every lens and while it is closed no light gets to the film. Of course no light would get to the mirror either, which would not be useful.

So, winding on lowers the mirror, which seals off the film and prevents it being exposed. The shutter then opens for focusing. The viewfinder is so bright it would amaze you, because it is an aerial image that cannot be focused. Only the centre of the viewfinder is a ground glass and this is where you must carefully focus.

You press the shutter release. The shutter closes, the mirror flips up, the shutter opens for the exposure time set and then closes again. The viewfinder remains dark because it is not an instant-return mirror.

I think it's amazing that all these mechanical linkages operate in just 50ms.

I'm also amazed that another forum found the subject of shutter lag contentious. It just goes to show that anything can be a source of argument!

Comment by johnriley posted on Count those milliseconds! at 09/09/2008 - 21:56

johnriley
A belated response...shutter lag is the time between pressing the shutter release and the shutter actually firing.

Some older digital cameras are so slow in this regard that it's almost painful. We have an early 1.3MP Kodak compact and it seems to take forever before the shutter actually releases. Obviously not good for action shots.

Whatever its speed, the K10D on the other hand is fast enough. The only point I was making was that what was once considered slow would now be considered fast, which I thought was interesting.

Comment by johnriley posted on Count those milliseconds! at 09/09/2008 - 21:00

johnriley
The focusing may not be that close, but a 300mm lens (450mm-equivalent) at 1.4m is an enormous degree of magnification. Older lenses might have focused no closer than 15 or even 30 feet....

The magnification is ideal for images of small plants and animals.

Comment by johnriley posted on Pentax 55-300 photos at 09/09/2008 - 19:56

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