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johnriley

Joined: 19th March 2002

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johnriley
As well as all the corrections needed to manitain performance over all focal lengths, one of the compromises that has to be made is that of holding focus. This will depend on the lens desigmn, but also on the quality of the mechanical components as well.

A Leica zoom might be expected to hold its focus when zoomed better than any kit lens. It might cost a bit more as well.

The first zoom that wasn't was the legendary Vivitar 38-80mm, which started the modern zoom being taken seriously. It was not a zoom as it did not hold focus when zoomed. Many modern zooms are not true zooms in the same way, although even those that are probaly hold focus only approximately.

There is no such thng as total accuracy, so I always zoom first and then refocus. If you want to see the effect focus on something close with the kit lens and then zoom as you look through the viewfinder. It will go way off.

Comment by johnriley posted on Focus adustment on a K10D at 04/04/2010 - 23:29

johnriley
This was intended as a portrait lens and will have fairly soft contrast at the widest apertures, but sharpening up at smaller ones.

Comment by johnriley posted on SMC Pentax 120mm f2.8 at 04/04/2010 - 21:22

johnriley
Just once in one place please!

Comment by johnriley posted on My K20D,18-55 and D-BG2 grip for sale! at 04/04/2010 - 21:19

johnriley
simonkit wrote:
I can't really choose an answer from the poll as it very much depends on the UK weather - in other words it's anybodys guess !!


Simon
The new weather resistant bodies and lenses leave us with no excuse! There are plenty of terrific images to be had in the rain, and it is somewhat liberating.

As for when do I use my cameras - every day, every opportunity. That's why it's not a problem finding 365 images a year for ePHOTOzine!

Comment by johnriley posted on Poll - How often do you use a camera? at 04/04/2010 - 09:58

johnriley
Unfortunately the link doesn't want to play just now, so I'll try again later.

However, in the real world I think for most of us digital has already surpassed the quality of film. I know in theory film might resolve more, but in practice few of us can reach the standards that film might allow.

If I had my films processed at Boots (or wherever else in the High Street) then there's no argument - digital will be better.

Comment by johnriley posted on Womble uses film......common sense really. at 04/04/2010 - 09:26

johnriley
Could be, you enjoy it all!

Comment by johnriley posted on 400-600 zoom at 03/04/2010 - 18:53

johnriley
I honestly have little idea as they are so rarely offered. Therew as one on eBay a while ago that went for around £250 if I remember correctly, but it will depend very much on the condition.

Be careful that you try it before you buy it as mirror lenses can be easily knocked out of alignment by rough handling.

Comment by johnriley posted on 400-600 zoom at 03/04/2010 - 15:46

johnriley
The effective aperture changes as you zoom, for the usual reasons, but you can't change the aperture.

thoramay, if you decide you don't want it drop me a PM with a price please...

Comment by johnriley posted on 400-600 zoom at 03/04/2010 - 15:01

johnriley
You can start a thread in Your Photos, or post in the gallery, as you wish.

Comment by johnriley posted on 7th Annual Pentax day at 03/04/2010 - 14:01

johnriley
From a practical point of view, the only thing really is that it would be nice to see the before and after versions to see what has changed. In this way something could be learned by everyone about the comments made and whether or not implementing them made an improvement.

The only place where replacing photos is not done is in the competitions, where to do so would be unfair.

Comment by johnriley posted on Apology. at 03/04/2010 - 10:42

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