Nice one Mongoose..

A challenge indeed then..

Sadly again, only for those with a late 90s onwards 1 pence piece.. post the greatest magnification of IRB.. it will be taken on trust that no-one blew up a picture to suit.

In the words of Arnie.. I'll be back.. I haven't tried reversing a 300m 5.6 off of the soligor.. and I have another 2x converter to hand..

Without glasses, I wouldn't be able to put my socks on of a morning, so this should be interesting.

Cheers

Liam

Hi all,

I thought today I would see how macro I can go..

Sadly this can only be checked by the British contingent (unless you have an english penny later than the late 90s).

Dig in your pocket and get a shiny penny out; now have a look underneath the Queen's neck.. just between that and the EL of Elizabeth's name, you can just make out three letters IRB..

..well here they are. This is uncropped, and except for a little clean up, is as it came out of the camera..




I tried measuring it, (what?? with my eyes) and the image represents just a little over 1mm.. call it 1 1/4mm for the ease of maths, and thats 20x magnification..

I'd hate to think what the DOF is at that magnification, and that was as good as I could get the focus, but I'm guessing it'll be measured in microns rather than feet..

Now, as the schools have been closed today, here's your little known fact.. IRB stands for Ian Rank-Broadley, the sculptor who originally designed the portrait for the coin. Here endeth the lesson..

What I used: DL, Soligor 70-210 macro lens (at full macro extension) with two 30mm extension tubes, one 2x converter, and a 50mm 1.7 reversed over the end. I'll see if I can get any closer later in the week.

Cheers

Liam

Hi Hoofer, and welcome to the forum.

If it's a fully manual lens, which I'm fairly certain it is, then it won't have any electrical contacts to tell the camera what aperture it is. As it's a fixed aperture, there is also no finger to tell the camera either. This means that it will work out how much light is hitting the sensor and that's it. There is no way (or need for that matter) for the camera to know the aperture. Focus and click the shutter.

Hope that helps..

Cheers

Liam

Hi Pete..

http://en.wikipedia.org/wiki/Chromatic_Abberation

that'll give you a start.

Cheers

Liam

Hi,

I did muck about with the border.. and I think you're probably both right..

..so here it is with a plain one.. and thinner..




Cheers

Liam

Hi all,

just thought I'd put up another sunset photo for you.. that'll make a change .




..that's Portsmouth's Spinnaker Tower on the horizon.

I took it a few weeks ago, but I was having a look through the folder last night, and I liked it this time

Cheers

Liam

That last one's superb Will.. not much more to add really..

Cheers

Liam

Thud....

That's the sound of George fainting..

Cheers

Liam

Hi all,

Do you have folders and folders of photos on your computer, all listed as IMGPxxxx.jpg/PEF?

Here's a way to rename them quickly.

Open the folder, then on the toolbar go to View | List. Next highlight all the files, by holding down Shift while clicking the first and last images in the list, or by clicking the mouse somewhere in the folder and pressing Ctrl + A (select all). Now all the file names in that list are highlighted, right click on the first image in the list, and choose Rename from the drop down menu.

Choose the name, for instance Photos of London Eye (1), making sure to put a number in brackets as shown. I started with the number 1, but if you have a couple of folders from different visits, dated accordingly, then you can start with any number you want, and have a continuation from the first folder.

Next click the mouse in open space in the folder, and you'll have all files listed numerically..

Photos of London Eye (1)
Photos of London Eye (2)
Photos of London Eye (3)
Photos of London Eye (4)

..etc.

nb. I've checked, as is it's obviously vital that your PEF files remain absolutely unchanged from the originals, and using a tool to check the md5 checksum (a way of checking a file's integrity) of a file both before and after renaming, it is still the identical file.

Hope that helps,

Cheers

Liam

Hi again..

http://www.cgsecurity.org/wiki/PhotoRec

I was looking through a few resource pages and found this.

Looks as though it was built around photograph data recovery, judging by the name (ooh! I'm a detective) and the file extensions it covers. It doesn't explicitly cover Pentax RAW files yet, but I assume all that's needed is a sample file for the writer to add this, and he has a contact at the bottom. If you think it's useful (Matt, Peter or Roger.. probably your area off expertise mainly), have a go and see if it works. I can submit a RAW file from a DL for him, but if anyone wants to send me a RAW file for other models, I'll happily forward them if that's the way it works.

Cheers

Liam.. oops, must go.. have to lose at pool tonight..