I am aware of the rule, with full frame 35mm, that with a lens of x focal length, if x extension is applied, a repro. Ratio of 1:1 is achieved.

Does this still apply on APSC?

Thus, with my 100mm d fa macro, if I extend it by 100 mm, will I achieve 1:1 repro ratio?

......but I get that anyway.......albeit with/by focusing the lens......

Could someone please explain, put me right?

Thanks,

Roger.

277 quids!





Roger

The tube was, indeed, a Jessop's, one of the set I bought new, Ages ago to use with my MX.
One on its own performs very well but, when used all together, they seem to acquire a collective slackness which makes the contacts a little unreliable.

Did the website mention a cost of the Pentax ones? (:shock

Thanks, all, for looking.

Roger.

Thanks, David.

I'm afraid I "cheated", inasmuch as I cut a half- inch vertical section of the trumpet away to reveal the base of the stamens, etc.
This was enough to let in the ring flash light & give a clearer view of the beetles.
Sorry to let you down but, again, thanks for looking & your kind comments.

Roger.

....all about 4mm long, deep in a daffodil flower's trumpet.

K5, 100 mm D FA Macro + 31mm ext. tube. Pentax AF080C Ring Flash. All @ f18, ISO 80.
Handheld, manual focus.

Elements 11.



















Any thoughts most welcome!

Roger.

My first IR image with K5 & 188-55 kit lens + R72 filter.




Any C&C welcome.

Roger

Er........

Ask the manufacturer (tomorrow !)?

Roger

It's a Wedmore SP14 from Bunel Microscopes, David.

Roger.

Not a very nice day here, so indoors this afternoon.....

All K5, body only.
Attached via the Pentax Microscope Adaptor to my microscope.
Polarising filters both above & below the stage.
Manual focus with the microscope coarse & fine adjusters.
Focus light, an led torch.
Imaging source, Pentax AF 280T, manual, white paper reflector angled under the microscope stage.
100th. sec., ISO 100.

Elements 11, copy layer converted to mono, high-pass sharpened, hard light blended with colour original.













The urea comes from work, where it's used (Adblue) as an additive for our lorry to reduce emissions


Any C&C welcome!

Roger

Cheers for the comments, all & thnks for looking.

Roger.