Comments made by johnriley - Page 445

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You need the Fresnel etchings otherwise the view would be dim at the corners. The screen shouldn't be getting dusty, just be careful to change lenses in a dust free environment (as far as is practical) and point the camera throat downwards whilst doing so. This avoids dust settling or falling into the camera.

Comment by johnriley posted on Manual focus lenses on Pentax K-5 II at 21/03/2014 - 13:44

Most enlarger lenses are 39mm leica screw thread. Adapters are available for 42mm screw and also 25mm screw.

Camera lenses are not generally suitable for enlarging as they don't have a flat field, but some 50mm f/3.5 ones might be OK.

Comment by johnriley posted on Wanted: film developing kit at 21/03/2014 - 13:23

You'll recognise the names of the best lenses, Nikkor, Rokkor, Rodenstock, Schneider, etc.

f/4 lenses are generally 4 element designs, f/2.8 lenses are generally 6 element designs.

Comment by johnriley posted on Wanted: film developing kit at 21/03/2014 - 12:23

At 04:08 the lens was loaded onto the vehicle for delivery, so it was in Preston at that point.

I await it keenly - I wonder how it's getting on now? These delivery services are fantastic, we can track everything as it goes, sometimes even getting text messages to say delivery is imminent.

Comment by johnriley posted on 07 Shield Mount Lens or Holga lens? at 21/03/2014 - 10:45

Agreed Steve, they are all AF screens.

However, there were a huge number of different LX/MX screens - are none of these adaptable? They don't seem to be available in large numbers though. How about the relatively huge used market of Olympus OM screens? I've had must be getting on for 30 or more of these to sell over the past year or two. Any good?

Comment by johnriley posted on Manual focus lenses on Pentax K-5 II at 21/03/2014 - 09:39

There are currently a few screens available for the DSLR range.

The difference is that these days most users no doubt use AF and AF systems may have different requirements to the human eye. They can certainly focus more accurately in lower light.

Comment by johnriley posted on Manual focus lenses on Pentax K-5 II at 21/03/2014 - 08:46

There are special screens for some lenses, such as the f/1.2 ones and also the ultra-wides. Equally, long telephotos also have different screens ideally.

The first 18mm lens, from Zeiss, had a special pink tinged screen supplied for the Contarex that the lens fitted.

Comment by johnriley posted on Manual focus lenses on Pentax K-5 II at 21/03/2014 - 00:07

It all depends on what we consider the human eye is doing when it assesses the point of focus. As far as I know a major part of this is the judgement of the point of maximum contrast.

The judgement of the point of maximum sharpness could be quite difficult on a small focusing screen. For this reason I have never put any faith in stop down to show the DOF. The eye is just not up to it.

Comment by johnriley posted on Manual focus lenses on Pentax K-5 II at 20/03/2014 - 23:53

I would think the K-5 would suit you very well, especially as you appreciate the construction quality of your LX bodies.

Magnesium alloy shell, weather and dust resistant and not too far out of date by any means. Of course the K-5 II or K-5 IIs would also be equally suitable, but a little more expensive.

Going further back than the K-5, the K20D could be another best buy. I still use one of these for studio shooting and they still produce excellent images.

Comment by johnriley posted on help needed choosing a digital slr at 20/03/2014 - 16:36

Looks good to me. There are plenty of places to use it too in your part of the world.

Comment by johnriley posted on HD PENTAX DA AF 1.4X AW Rear Converter at 20/03/2014 - 13:22

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