Thistle Pollen
Posted 10/07/2019 - 18:18
Link
The second image is particularly good 😁
Chris
www.chrismillsphotography.co.uk
" A Hangover is something that occupies the Head you neglected to use the night before".
-------------------------------------------------------------
K1 - Sigma 85mm F1.4, Pentax DFA 150 -450 F4.5 / 5.6, Pentax DFA* 24 - 70 F2.8
Samyang 14mm F2.8, Pentax DFA* 70-200 F2.8, Pentax A 50mm F1.2
K3iii + K3ii + K5iis converted to IR, Sigma 17 - 70 F2.8, Pentax 55 - 300 F4.5 / F5.6 PLM
www.chrismillsphotography.co.uk
" A Hangover is something that occupies the Head you neglected to use the night before".
-------------------------------------------------------------
K1 - Sigma 85mm F1.4, Pentax DFA 150 -450 F4.5 / 5.6, Pentax DFA* 24 - 70 F2.8
Samyang 14mm F2.8, Pentax DFA* 70-200 F2.8, Pentax A 50mm F1.2
K3iii + K3ii + K5iis converted to IR, Sigma 17 - 70 F2.8, Pentax 55 - 300 F4.5 / F5.6 PLM
Posted 10/07/2019 - 19:28
Link
Phenomenal!
Have you any idea what the diameter of one of those pollen grains is?
Steve
Have you any idea what the diameter of one of those pollen grains is?
Steve
Posted 10/07/2019 - 22:51
Link
Really nice images. Really good display of what a good focus stacking workflow can achieve.
Hats off to you sir
Hats off to you sir
I know what i like, If not always why.
Posted 10/07/2019 - 22:53
Link
Thanks,Chaps.
Put an uncropped frame of the stack on my screen.
(Roughly) measured the frame width on screen as 230mm, & one of the grains ,on the same screen, as 2mm.
The grain is, therfore approx. 1/115th. of the (APSC) frame width.
APSC frame with is approx 23.7mm.
23.7mm divided by 115 = roughly 0.2.
The grains are approx,. 0.2mm in diameter.
Is this ok, does it work, is it about right..............?
(Edit)
No.This combination of lenses gives a repro. ratio of 4:1, so.......
Does that make the grain (0.2 divided by 4) = 0.05mm.
Excuse me, my brain hurts.
I'm going to bed......
Thanks for looking,
Roger.
Put an uncropped frame of the stack on my screen.
(Roughly) measured the frame width on screen as 230mm, & one of the grains ,on the same screen, as 2mm.
The grain is, therfore approx. 1/115th. of the (APSC) frame width.
APSC frame with is approx 23.7mm.
23.7mm divided by 115 = roughly 0.2.
The grains are approx,. 0.2mm in diameter.
Is this ok, does it work, is it about right..............?
(Edit)
No.This combination of lenses gives a repro. ratio of 4:1, so.......
Does that make the grain (0.2 divided by 4) = 0.05mm.
Excuse me, my brain hurts.
I'm going to bed......
Thanks for looking,
Roger.
The more I look, the more there is to see!
Posted 10/07/2019 - 23:22
Link
That's just stunning work, well done. Love seeing stuff like this (that's genuine backyard science!)
All the gear with no idea
Posted 10/07/2019 - 23:55
Link
I really like the second one too.
+1 agreeing with the backyard science comment above:
2 lenses (one reversed)
a flash
39 frames
3 slabs (whatever they are)
great work.
+1 agreeing with the backyard science comment above:
2 lenses (one reversed)
a flash
39 frames
3 slabs (whatever they are)
great work.
Peter
My Flickr page
My Flickr page
Posted 11/07/2019 - 13:57
Link
coker wrote:
Does that make the grain (0.2 divided by 4) = 0.05mm.
Wikipedia says the diameter of a pollen grain is between 0.006mm and 0.1mm, depending on species. So your estimate looks pretty good to me. And you've got detail on those grains that could well be 1/10 of 0.05mm = 0.005mm.Does that make the grain (0.2 divided by 4) = 0.05mm.
Have you ever thought about getting a scanning electron microscope? No need for focus stacking, think of the time you'll save!!
Steve
Posted 11/07/2019 - 21:50
Link
Impressiv!e! Composition-wise, I prefer the second image - very well processed, too
Posted 11/07/2019 - 22:56
Link
After a tentative enquiry, shall we just say it would have to be birthday & Christmas combined,
OR
the basement gym & cinema would have to be put on hold
AND
the shepherd's hut & the beach hut at Sandbanks would have to go as the down-payment......
Oh, sorry!
It seems I've been dream-posting.....
Roger.
OR
the basement gym & cinema would have to be put on hold
AND
the shepherd's hut & the beach hut at Sandbanks would have to go as the down-payment......
Oh, sorry!
It seems I've been dream-posting.....
Roger.
The more I look, the more there is to see!
Posted 11/07/2019 - 23:02
Link
Peter, a slab is a sub-stack.
So, in this case 3 slabs x 13 as opposed to 1 stack x 39 frames.
I find it's a bit quicker.
( NB but see above,,,)
Roger.
So, in this case 3 slabs x 13 as opposed to 1 stack x 39 frames.
I find it's a bit quicker.
( NB but see above,,,)
Roger.
The more I look, the more there is to see!
Add Comment
To leave a comment - Log in to Pentax User or create a new account.
1547 posts
16 years
Wiltshire
AF280FT on camera diffused flash.
Manual focus & exposure.
39 frames, in 3 slabs, stacked in Combine ZP.
Elements 11.
Any thoughts or comments most welcome, thanks for looking,
Roger.