Comments made by johnriley - Page 1106

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I'm not sure we have numbers any more, so your username must be the key to this.

Comment by johnriley posted on Please help me with a dilema at 19/08/2011 - 15:10

I would go for the repair and if I was very lucky they might have to replace it with a new lens anyway.

Ideally I would go for the other option and have the new lens, but only if I could keep the broken one. Then that could be repaired as well and put onto eBay later to offset the costs a bit.

Comment by johnriley posted on Please help me with a dilema at 19/08/2011 - 14:24

Quote:
I also think they need some sort of 70-200mm f2.8

They do, it's the 50-135mm f2.8 lens. Same as 70-200mm on film in terms of field of view.

Comment by johnriley posted on An open Letter to Ricoh at 19/08/2011 - 11:48

Smoke and mirrors in the numbering I suspect, as it gives us no clue whatsoever how many of these were made.

Comment by johnriley posted on MZ-M mystery at 19/08/2011 - 11:46

Something is muchly amiss here. There's no reason why a wide angle lens should not be sharp at the edges. Maybe stopped down for optimum results, but it should be sharp.

Do you have a problem with current wide angle designs?

Comment by johnriley posted on what is your tip when using manual focus under f2.0? at 19/08/2011 - 11:45

This may be where UK and German law diverge a little.

Comment by johnriley posted on grrrrrr eBay numpties at 19/08/2011 - 11:22

Algernon wrote:

johnriley wrote:
What doesn't work Algi? Field curvature will only be a problem in the near field, or at wide apertures, so not really changing the usefullness of that red-coded f8 setting on the pentax manual focus WA lenses.

You can get an idea what I'm talking about from this post. link Look at the "1:1 (100%) RHS of frame Compare captured by a screen grab at 800 wide." = RHS of Bridge shot by Chinon 28mm. The bridge was 40-50m away I was square off it and focused on the centre. The RHS of the Chinon shot is very soft. I've not retried it with this lens, but I did with another lens. It was soft as well when focused on the bridge, but when I set the lens to infinity, the centre stayed in focus and the edge went a lot better indicating a massive field curvature. The curvature now being close to infinity.

You can see this on most distant landscape shots with a 28mm sharp in the centre at a distance, but soft at the edge at a distance, but when you look at the edge closer to the camera it doesn't look too bad.

My feeling is that decentering and just poor design may have as much to do with this as any field curvature. Chinon are not the greatest lenses. I've never seen such a problem with any Pentax wide angle lens, or Nikon for that matter.

Comment by johnriley posted on what is your tip when using manual focus under f2.0? at 19/08/2011 - 11:19

Quote:
It is not the customer who makes the offer.

I'm pretty sure you're wrong on this, based on research I've already done quite unconnected with Pentax User. A different life elsewhere...

Comment by johnriley posted on grrrrrr eBay numpties at 19/08/2011 - 10:16

I was suggesting a scenario with a simple but horrifying genuine mistake in the listing that can't be corrected before someone jumps in to buy. Suppose it was a Leica 50mm f1 Noctilux...would we expect to buy it for £10 when it's an obvious error?

Just a question out of curiosity.

Comment by johnriley posted on grrrrrr eBay numpties at 19/08/2011 - 10:09

Quote:
I'd suggest looking for a Super Takumar 55mm - the f1.8 and f2 are essentially identical apart from the maximum aperture

So much so that some of the lenses are only f2 because a baffle is inserted in the lens to reduce the maximum aperture. Add a different aperture ring and we have the f2 version!

Comment by johnriley posted on Impulse Buy Spotmatic at 19/08/2011 - 10:05

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