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johnriley

Joined: 19th March 2002

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johnriley
Johnsons, Asahi Photo or Harrow Technical all specialise in Pentax and will be able to clean the diaphragm on your lens.

It will mean packaging up and sending the lens, but it may well be cheaper to do that than travelling somewhere and parking.

It's a simple job that shouldn't take very long to do.

Comment by johnriley posted on 70 ltd busted at 19/07/2012 - 09:18

johnriley
Yes, it's a well known and understood effect. The effect on both cameras will be the same as the only thing that affects perspective (what causes the compression you refer to) is the camera to subject distance. The lens itself plays no part in this at all.

Also try taking the same picture with a wider lens from exactly the same spot. Then blow up the centre to match the FOV of the longer lens. The compression effect will be identical.

Comment by johnriley posted on We always seem to pay more! at 19/07/2012 - 07:53

johnriley
Nothing has been deleted Peter, but I'll have a look at your PM now.

Comment by johnriley posted on Rolls Royce Special Edition at 19/07/2012 - 01:19

johnriley
Oh I see puma. It came straight after major's post and seemed a bit of a mysterious comment.

Comment by johnriley posted on photography is not a crime at 19/07/2012 - 01:01

johnriley
Quote:
Please extend him the courtesy of informing him of PU's reasons for their action.
That courtesy has been extended and I have seen a copy of it. For what it's worth I agree with what was written. You know as well as I do that you can talk to him yourself quite easily and that this was not a sudden and spurious action, but the end of a long process.

There is no banning willy-nilly as you put it Peter, it is always a last resort. There is no personality clash. This is a photographic forum.

Comment by johnriley posted on Rolls Royce Special Edition at 19/07/2012 - 00:52

johnriley
What is?

Comment by johnriley posted on photography is not a crime at 19/07/2012 - 00:44

johnriley
Quote:
How is that compensated for with a 55mm lens?
55 x 1.5 = 82.5 or approx 85mm. To get the same view you have to back off to the same distance as an 85mm lens on full frame. Perspective is only controlled by the viewpoint, that is, how far away you are, so the effect is the same.

Hence, the 55mm is the classic portrait lens on an APS-C camera.

Comment by johnriley posted on We always seem to pay more! at 19/07/2012 - 00:43

johnriley
We extend the courtesy of confidentiality so, as you know Peter, we don't discuss these things in the forum.

I know that curiosity is a terrible thing and I sympathise with that, but in all fairness to anyone who ever is banned surely it's better to just let it go until whatever the problem is can be resolved?

Comment by johnriley posted on Rolls Royce Special Edition at 19/07/2012 - 00:33

johnriley
The K30 offers 6fps and 3fps - happiness? It could be just what you're looking for.

Comment by johnriley posted on POLL. How useful is the K-5 Low speed continuous 1.6fps at 18/07/2012 - 23:53

johnriley
What is the slower rate on the K30? Is it any help with your requirements?

Comment by johnriley posted on POLL. How useful is the K-5 Low speed continuous 1.6fps at 18/07/2012 - 23:45

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