Looks hot work.... well captured!

Lovely colourful picture, can't see anyway to
improve it

I find a wheelbarrow works quite well

If you look inside the springs directly under the 135mm lettering
near the top of the pictures, it's very dark on the 1st.
On the last it's so light you can see inside the spring
indicating that it has been pulled.

The DOF looks similar in each one to me only 5 links
of the hanging chain in focus top and bottom.

The original of this shot was just BLACK, but it pulled
up quite easily.

https://www.pentaxuser.com/photo/nuthatch-30599/large

-

This may be of interest to some. I used a couple of 'M'
lenses exposed via the Green Button at every aperture f/2.8 to f/22 using an Expodisc
pointed at white clouds. 100ISO

I then read the RGB values off the jpegs.

f/5.6 to f/11 either gave the correct exposure or it would be correct
with a small amount of compensation. Outside of that the photo was too
dark.

Grey_Exp_Test_M_28mm_f3-5_and_35mm_f2-8.jpg




-

I think it must do, because it hasn't opened up the aperture.
It's just a pre-set really.

No problem focusing with any lens stopped down to f/5.6.

With a 28mm the lens can be taped up at INF and f/8 and
Av used..... everything from about 3M to INF will be in
focus

I had a 28mm f/2.8 M with a damaged focusing ring.
I Dremelled off the aperture lever to see how it worked
in Av with a K-5.

Seems OK.... possibly better than it did as a Manual
using the green button. f/4 gives the correct reading.


The shots were of a gray card. The RGB values were read
straight from the jpegs in an editor.

I would normally do an RGB balance before this type of test
so that they are all the same for RGB.

28mm f/2.8 M after Dremelling off the aperture lever
====================================================
200 ISO : Outside
Av Mode K-5

f/2.8 102 105 124 1/640
f/4 115 118 137 1/320 Nearest to 117/118 = Correct Exposure
f/5.6 131 134 151 1/160
f/8 131 134 151 1/80
f/11 145 148 165 1/30

Sorry I missed Steve saying he was in AV

Do you mean that they have stopped going on about the Titanic

Something wrong with your equipment there Steve

I've resolution tested loads of M and A lenses usually at f/1.4 to f/8
even sometimes at 1/3rd stop intervals using available light and
flash. The aperture lever always gets pushed and closed by a K-5
and K20D and prior to that K10D. With flash you definitely know
when the aperture has closed down, because the picture is too
dark, if you've forgotten to change the manual setting on the
flash.

I have seen a K10D with a broken stop down mechanism.

You should hear it when you stop down. You can also look at the
front of the lens and see it.