I was always under the impression that you needed a light source "above" the negative to enable proper scanning.
Otherwise, you could just lay the neg straight onto the scanner glass (thinks to self - must try this and see what happens). Of course, the average document scanner will not have the resolution of a dedicated neg scanner (but that would never bother the Lomo gang).
Geoff

PM sent.
Geoff

I am sure that there are several of us who would be glad to advise you - if you will tell us which car to buy next

Geoff

Sorry, Algi, I cannot agree with this. Maybe there is a third T-mount variant that neither of us has ever seen.

The O/D of the parallel portion (onto whick the camera body specific adapter fits, and which is retained by three Vee-point grubscrews) on my Vivitar 500 mm mirror is 46.5 mm. It is rather hard to see how removing an M42 X .75 mm portion could leave behind a larger plain portion without arranging matters so that the overall length of the mounting had its length drastically altered (with a consequent effect on infinity focus).

I have never had any problem obtaining small(under 3mm dia) screws in short lengths - provided I bought them in lots of 100 plus. My own need at one time was for M2 x 3,socket head, countersunk screws (used four at a time and four more provided as spares).

Geoff

The T-mount with the fine M42 thread is the T2. Some adapters for the T" were made so that the assembly could be rotated to put the focussing index mark at 12o/c. This was locked in place with three screws.

The first T-mount was a plain parallel standout portion, with a Vee groove. The mount adapter was bored with a fine clearance onto the standout. The three pointed grubscrews locked this into position, and also allowed alignment of the index mark.

Just do not, never, ever, try to screw a T2 lens into a M42 mount camera. You may be lucky and get it out. The threads may not be too badly damaged. But, you might not be lucky!

Geoff

Which T-mount Paul?
If they have a thread (T2), then you start by thinking T2 to M42, and M42 to K, I assume that there are some people who can supply T2 to K adapters, but only SRB Griturn come to mind.
If it is an original T-mount (secured with three vee-nosed grub screws, sometimes called T1) then SRB might ... just might ... be able to do a direct K-mount adapter. I do have an original T-mount 500 mm mirror with a K-mount fitting, but it is the only one I have ever come across.

Geoff

Wrong question, Paul.

You need a K or KA adapter to fit Adaptall-2 lenses onto any Pentax with a K or KA mount - K100D included.

With a K-adapter on the K100D, you will need to familiarise yourself with the operation of manual lenses. Hint - search on "uses aperture ring" and "green button".

K-adapters are quite cheap, KA ones run £45-£55, but it is well worth getting one (or more).

Geoff

1 - Remind them that you are not a trained teacher - "so if something need more explanation ---ASK".

2 - I have never worked with people with mental health problems, only with the disabled. The principle is probably the same: they can do most everything that you can - but they are normal and you are the abnormal one.

3 - Every time you introduce a new concept or technique, make sure that everyone has grasped it before you move on.

4 - For a bit of practice, put your right hand in an old sock (boxing glove if you have one) and start to demonstrate the normal use of your camera. You will find way of coping with your new disability, and this may give you a handle on how to put things across to your class.

HTH Geoff

Sorry! my two images are both 1400 x 1050 Pixels.Yours are not. And that gives a clue The two options are to constrain proportions or to resample - you can choose one and the other is not available. Yes, I want to retain the size, not the proportions; you have refrained from resampling and lost the desired size by retaining the proportions.

Either way, both my images are the same pixel dimensions, but the file sizes are different (and the image dimensions in inches, and the quality, are also different). I could spend a lot of time playing around with a number of images in different editing programs, but I have to prepare for a hospital appointment tomorrow.

Geoff

Well, you would think that was the case. I had never bothered with the 72PPI since I have always handed my entries in on a memory stick. So, before I sent an e-mail winging its way to our Comp. Sec., I did a quick test.

An original image straight from my K20 in "Best quality" JPEG
10.7 Mb

An original image straight from my K20 in "Best quality", resized to 1400 x 1050 pix
1.7 Mb

An original image straight from my K20 in "Best quality", resized to 1400 x 1050 pix at 72PPI
540 Kb

Now, to me, that is not exactly what you would call "bugger all difference". Resizing was done in PS Elements 10. No other PP was applied. And yes, I have the original DNG file as well (I always shoot RAW + JPEG).

Geoff