pschlute

Joined: 31st May 2006

All Forum Comments

Topics Created Topics Contributed Forum Comments Photo Comments

All Forum Comments

pschlute
Jonathan-Mac wrote:
How would a close-up add-on lens change a lens's focal length?
Adding any elements or distance between existing lens and focal plane can certainly change a lenses FL. The latter is defined as "the distance between the optical centre of a lens and the capture medium (film or sensor).

What surprised me is that adding a close-up lens (magnifier) actually decreases the FL. I would have thought the opposite, but am not experienced enough in optics to know.

Comment by pschlute posted on Raynox and SR at 12/04/2023 - 19:32

pschlute
MikeInDevon wrote:
I'm guessing it's the same sensor but without the Bayer colour filter so you'll get monochrome images with effectively pixel shift resolution with a single image not 4 consecutive images needed for a colour pixel shift image.

Mike
I don't see the pixel-shift connection. My understanding is that a monochrome sensor is all about the grey shades. I understand that it will encourage folk to use yellow or green filters on the lenses like when shooting film.

But I still do not see how this will be an improvement on what we currently have. In Photoshop I can replicate any filter colour under the sun, and selectively too.

I am not knocking the new product, merely trying to understand it.

Comment by pschlute posted on Pentax K3 III Monochrome at 12/04/2023 - 19:25

pschlute
LennyBloke wrote:
It appears that this may well be the subject of the Ricoh announcement schedule for tomorrow - an announcement appeared and was taken down very quickly, but one of the users over on the US forum captured a screengrab and has sourced images of the new adaptation of the K3III

Interesting as an addition to the Pentax line-up - quite Leica-esque
It certainly has the forums a-buzzing !

I still don't know how a monochrome sensor can produce better images than a colour sensor camera and a good bit of software on your computer, I am keen to learn

If it sells well for Pentax I am all for it.

Comment by pschlute posted on Pentax K3 III Monochrome at 12/04/2023 - 13:02

pschlute
What a cracker

Comment by pschlute posted on Waiting for the Stars. at 09/04/2023 - 10:55

pschlute
Interesting question, and not my area of expertise.

A bit of googling shows that a close-up adapter increases magnification, allows a closer working distance, and decreases the lens's FL

I guess therefore if the lens is set to 300mm, and so is the SR, you may have over-compensation from the SR , depending on of course shutter speed and how steady you hold the camera.

I would suggest you do some experimentation at various manual settings for SR (at and below the FL used), as well as OFF

I would be interested to see your findings.

Comment by pschlute posted on Raynox and SR at 09/04/2023 - 10:53

pschlute
I love squirrels.

Comment by pschlute posted on FA* 300 f4.5 wide open. at 07/04/2023 - 19:02

pschlute
Darrel wrote:
Anyone aware of any rumours as to what might be coming down the line from Pentax in terms of a new camera? Will they go for mirrorless?


No


Darrel wrote:
Will they stick with APS-C?
Yes, as well as FF and MF

Darrel wrote:
Are they interested in improving the autofocus capability?


Yes, and have done so with K3 III and KP and K1-II

Darrel wrote:
I have a K3II, which is very good but I feel it's lagging behind offerings from other manufacturers now.
Hmmm... what other manufacturers offer a modern DSLR camera ?

Comment by pschlute posted on What's New? at 04/04/2023 - 20:38

pschlute
A good illustration.

When I used my K10D I was wary about going above ISO400 due to noise. With the K-1 ..... well you have demonstrated.

Comment by pschlute posted on Lesson from my mistake at 23/03/2023 - 04:51

pschlute
It is a shame. They were the first forum I ever joined.

There have been posts suggesting this, as well as other forums to visit, including two of which I was completely unaware.

Comment by pschlute posted on Dp Review to end on April 10th at 22/03/2023 - 19:45

pschlute
Classic beasts

Comment by pschlute posted on MX Siblings at 14/03/2023 - 20:37

Proudly supporting Pentax User

Samsung Logo Asahi Pentax Logo