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johnriley

Joined: 19th March 2002

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johnriley
The grip has to be slightly different because of the slightly modified shape that Samsung have decided on for their version of the K10D.

The grip is likely the same apart from the shape modification to the outer casing.

Comment by johnriley posted on Samsung GX-10 Battery Grip In Stock £39 at 13/10/2007 - 07:05

johnriley
Sunday at Midnight is the time.

The witching hour and also the closing time for our competitions, unless otherwise stated if things get delayed.

Comment by johnriley posted on Discussion : Weekly Competition No. 12 - "Hard and Soft" at 30/09/2007 - 13:09

johnriley
Quote:
Your pic was shot with a C***n ? ? ? ? ? ?
I noticed that as well. After the initial feeling of shock has worn off you will return to normal. Probably.

Comment by johnriley posted on Discussion : Weekly Competition No. 12 - "Hard and Soft" at 28/09/2007 - 23:02

johnriley
Well done everyone - not an easy subject!

Can Galoot now please do the necessary for the new competition?

Comment by johnriley posted on Weekly Competition No. 12 - "Hard and Soft" at 01/10/2007 - 10:24

johnriley
Quote:
So that would suggest that the lens release button has nothing to do with releasing an M42 adapter. Can anyone confirm this?
The lens release button has no effect on removing a Pentax Adapter K. Maybe it would be relevant with some other design of adapter, although I would have thought such a design could prevent infinity focus unless it incorporated lens elements.

Does the Kood adapter have lens elements?

Comment by johnriley posted on M42 Adapter, help! at 24/10/2007 - 23:07

johnriley
Tests are not everything as lenses vary and in any event the performance is more subtle than say a resolution check.

The best test is to see how the lens suits your own style of photography.

Comment by johnriley posted on Pentax A smc 100mm 2.8 at 23/09/2007 - 00:33

johnriley
The 100mm f2.8 lens, M or A series, is a beautiful optic and should give superb results.

Comment by johnriley posted on Pentax A smc 100mm 2.8 at 22/09/2007 - 17:19

johnriley
It's a complex field, but there's no doubt that the best 35mm lenses will out-resolve the best medium format ones, but, as I've described above, that isn't really the issue.

I have somewhere an article comparing the inexpensive Seagull TLR with the Nikon Nikkor 50mm lens and although the Nikkor is a much better lens the big prints from the Seagull were better.

Certainly the Hasselblad will knock spots off the Nikon.

Comment by johnriley posted on My stuff at 25/01/2008 - 20:01

johnriley
I can see where you are coming from on this, ChrisA, it does sound contradictory on the face of it.

Lenses have many more properties than sharpness. There are contrast, gradation, resolution and a host of other things.

However, in terms of resolution it is not necessary for a fine print at 16" x 20" to have as high a performance as it would be if the format were 35mm. In fact you get significantly better prints from say 6x6cm at this side with rather lower resolution figures. 16x20 inch prints would be challenging in 35mm terms and would need the very best lenses. Even then there would be a more obvious grain structure that would mar the smooth reproduction of tones.

A TLR Rollei lens might have a resolution of 32 lpmm and a SMC Pentax-M 50mm f1.7 might have a resolution of 96 lpmm. The former will give smoother sharper results whether it's projecting a slide or making a large print.

I hope describing things the other way round like this has helped to clarify it.

A Hassleblad Carl Zeiss 80mm lens might resolve 80 lpmm or more, so maybe that tells us something as well...

Comment by johnriley posted on My stuff at 25/01/2008 - 19:35

johnriley
I'm a great fan of Billingham bags. Beautiful traditional manufacture, very versatile and fantastic padding inside. Also, get the right one and access can be very fast.

Get the wrong one and by the time you've filled it you might not be able to carry it very far.

Comment by johnriley posted on The Slingshot Bags at 23/10/2007 - 16:50

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