Thanks, I think that is the explanation, Wicky has a good article but the maths leaves me cold.

Greg

My Grandfather on my mum side. Edward Archibald Crout

Greg

The print size is 5.5" x 14"

I have a picture in my mind of everyone sitting dead still for 60 sec or more and multiple manganese flashes popping all over the place.

We have it easy today and yet still complain about a dead pixel

Greg

Thinking about it I suppose the fact that it was probably taken on a large format plate camera with a relatively short, wide angle lens must be the reason.

Greg

I have been scanning our old family photos and this is one from 1922. What amazes me is the depth of field the photographer achieved bearing in mind that it was taken indoors, low light, and I presume he must have used a very small aperture. Did they have fast film in those days or is there another explanation as to how he achieved this DOF

It does not show very clearly here but if you download link the original version the DOF can be seen nearly as clearly as the original scan


Greg

Hi,

Thanks, I have taken an eye cup which can hold a correction lens, to my optician and they are going to fit my prescription lens. I have told them to mark the top of the lens with a notch so that if I ever remove it from the eye-cup I can reorientate it correctly.

I was concerned that the cameras adjustable diopter and the prescription lens would clash and will follow your advice.

Greg

Ooooh goodie, discount prices


Congratulations

Greg

Hi John,

I'm actually trying to improve the definition on my K200D, the adjustable dioptre can not be adjusted to suit my eyes and using reading glasses is a pain.

Greg

Hi,

My eyes have fairly bad astigmatism and being old I can also not focus on close objects. My understanding of the built in dioptre adjustment, K200D is that it compensates for close focusing and this works for me but I still can not get a crisp image of the focus screen markings.

Has anyone had any experience with a prescription dioptre lens on a DSLR camera, I know they used to be used on film cameras which did not have a dioptre adjustment built in.

I'm wondering if there will be a conflict between the two adjustments and whether or not I will have to remove the original built-in lenses from the K200D

Greg

A silly question, are you sure that the aperture actually closes down when you press and lock the aperture button Is there enough light to take a reading in the first place.

To check myself I've just run a quick test as follows.

Camera set to use aperture.

"M" Mode on K200D
Lens off "A" position. Press in and lock aperture button on bellows unit.
Set f stop, press green button, my camera selects a shutter speed.
Change f stop, press green button, gives new changed shutter speed.

"AV Mode on K200D
Lens off "A" position. Press fully in and lock aperture button on bellows unit.
Now as I change the f stop on the lens the camera gives a continuously variable shutter speed.

I have no idea what your problem can be

Greg