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Old 1 Week Ago
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Beagletorque Beagletorque is offline
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Olympus STF-8 flash and Oshiro converter mayhem.

A quick word on these 2 items as people have expressed slight interest, but first a photo.



I originally ordered the Nikon version of the Oshiro 60mm macro on Harold's recommendation. Mechanically it is acceptable, but optically it is quite remarkable especially for the price tag. It also performed very well with the MC-14 tele-converter (the TC nose fits nicely inside the mount adaptor) and I decided to purchase a cheap Nikon to Four Thirds adaptor to try the EC-20. That combination was not so good. Having bought the converter I decided to try the EC-14 and the result was fine. I then had the bright idea of fitting the MC-14 onto that combo. The only way to manage it was by modifying a 10mm extension tube (I cut the plastic centre with a hot wire (to avoid dust) to give room for the extra pin and the TC nose). Having balanced the aperture to keep diffraction to an acceptable level the resultant magnification is around 4.4:1 or 4mm across the frame at minimum focus distance. The working distance is about 40mm, allowing room for some flash using the STF-8. Obviously the usual caveats apply, it's impossible to focus without very good light when stopped down and depth of field is very small, nothing new there.

These are a couple of the first shots using this combination this morning.

Poppy sap drillers (slight crop).



Rocks in the road (cropped 30%).



Broken scales.




Spring tail (50% crop).




Aphid eye (cropped 10%)



The STF-8 is a miracle of a thing too.



Very light and easy to adjust from the camera SCP. No RC except it will control other flashes. Not a problem for macro as the max sync speed of 1/250th has little or no effect on the exposure from the background lighting at such high effective f-stops, so the flash arc time is effectively the shutter speed. The included diffusers are very good, but extra diffusion would be beneficial but difficult to implement in the working distance. To say I'm happy with it would be a mastery of understatement, expensive but worth it. The only slight down side is the mounting arrangement. An adaptor screws on the front of the lens into the filter thread and the flash head brackets attach to this ring. All the bracketary is behind the front edge so no problem there, but the outer diameter of the ring is large (84mm for the 62mm version) so lifts the front of the lens hampering a low shooting angle. It's not possible to cut it down as it screws on and the cutout may not be in the right place for another lens. There is an engineering solution which I may attempt at some point.

Congratulations for reading to the end!
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Old 1 Week Ago
Walti Walti is offline
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Re: Olympus STF-8 flash and Oshiro converter mayhem.

I'd like to ask a dim question....

What is the advantage of using TCs over extension tubes?

I've been using the Olympus 60mm macro with 52mm of tubes to get a 7.something mm field of view, I've added the MC14 and now have a 5.something mm field of view....

I'll try out my flash rig with it to see how it compares. (though I did like the STF-8 when i saw it at the photography show)
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Harold Gough Harold Gough is offline
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Re: Olympus STF-8 flash and Oshiro converter mayhem.

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Originally Posted by Walti View Post
I'd like to ask a dim question....

What is the advantage of using TCs over extension tubes?
TCs increase the magnification without decreasing the working distance for a given magnification.

Example.:

I have set my lens to give a FOV 10mm wide. Without touching the focus ring, I put a x2 TC between the lens and the camera. I then position the setup to be in focus (this will be furthe away from the subject by the physical length of the TC). The FOV will now be 5mm (and the effective aperture 2 stops smaller).

Harold
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Harold Gough Harold Gough is offline
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Re: Olympus STF-8 flash and Oshiro converter mayhem.

Quote:
Originally Posted by Beagletorque View Post
A quick word on these 2 items as people have expressed slight interest, but first a photo.
You don't give effective apertures for the images. All things being equal, it will be smallest for the springtail. Diffraction blur is likely.

With that in mind, I have applied my software for Microcontrast, Smart Sharpening and Topaz InFocus at my standard settings. This shows a useful increase in detail although you may prefer your own version. The website hosting doesn't do it full justice.



Harold
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Re: Olympus STF-8 flash and Oshiro converter mayhem.

Quote:
Originally Posted by Walti View Post
I'd like to ask a dim question....

What is the advantage of using TCs over extension tubes?

I've been using the Olympus 60mm macro with 52mm of tubes to get a 7.something mm field of view, I've added the MC14 and now have a 5.something mm field of view....

I'll try out my flash rig with it to see how it compares. (though I did like the STF-8 when i saw it at the photography show)

Harold beat me to the answer, but he is quite right.
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Re: Olympus STF-8 flash and Oshiro converter mayhem.

Quote:
Originally Posted by Harold Gough View Post
You don't give effective apertures for the images. All things being equal, it will be smallest for the springtail. Diffraction blur is likely.

With that in mind, I have applied my software for Microcontrast, Smart Sharpening and Topaz InFocus at my standard settings. This shows a useful increase in detail although you may prefer your own version. The website hosting doesn't do it full justice.



Harold

Harold, in the first picture you can sort of see I have taped the aperture at approx f5.6 which is what all the above were taken at. I'm not sure what this equates to at the sensor, but it is very dark in finder even with the boost at full wick!

I'm very happy for you to improve my pictures with your considerable expertise! What software do you use?
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Re: Olympus STF-8 flash and Oshiro converter mayhem.

It is possible that I have been tardy with my sharpening. I have reprocessed with a deconvolution method (presented in the second image). What do you think, I'm not a fan of the over sharp look but there may be a touch more detail?







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Re: Olympus STF-8 flash and Oshiro converter mayhem.

Andrew thanks for posting that it was very interseting and informative I need to get one of these lenses and I want an STF-8

Not the most insane macro set up I have seen

Look at this https://flic.kr/p/yS6Rof
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Re: Olympus STF-8 flash and Oshiro converter mayhem.

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Andrew thanks for posting that it was very interseting and informative I need to get one of these lenses and I want an STF-8
With your abilities you'd definitively kick some serious spring.
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Re: Olympus STF-8 flash and Oshiro converter mayhem.

That's a fine bit of photo nerdery, and some stunning images to boot. Nicely done!
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Re: Olympus STF-8 flash and Oshiro converter mayhem.

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That's a fine bit of photo nerdery, and some stunning images to boot. Nicely done!
Thank you kind sir.
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Harold Gough Harold Gough is offline
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Re: Olympus STF-8 flash and Oshiro converter mayhem.

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Originally Posted by Beagletorque View Post
It is possible that I have been tardy with my sharpening. I have reprocessed with a deconvolution method (presented in the second image). What do you think, I'm not a fan of the over sharp look but there may be a touch more detail?
Yes, the method involves micro contrast adjustment, which is crucial. You have about reached the limit of acceptable sharpening.

Harold
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Harold Gough Harold Gough is offline
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Re: Olympus STF-8 flash and Oshiro converter mayhem.

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Not the most insane macro set up I have seen

Look at this https://flic.kr/p/yS6Rof
Where is the telescopic rifle site?

Harold
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Re: Olympus STF-8 flash and Oshiro converter mayhem.

Thanks for the write-up - very useful and informative and of course fantastic detailed shots

Jim
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Re: Olympus STF-8 flash and Oshiro converter mayhem.

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Thanks for the write-up - very useful and informative and of course fantastic detailed shots

Jim
Thanks Jim, I see you found it!
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