Testing Olympus UPlanFL N 4x 0.13 (FN 26.5)

Have questions about the equipment used for macro- or micro- photography? Post those questions in this forum.

Moderators: ChrisR, Chris S., Pau, rjlittlefield

Pau
Site Admin
Posts: 5130
Joined: Wed Jan 20, 2010 8:57 am
Location: Valencia, Spain

Testing Olympus UPlanFL N 4x 0.13 (FN 26.5)

Post by Pau »

I found this lens used at a good price and being aware that Charles Krebs uses it with excellent results I bought it. It came pretty dirty and after a good cleaning I'm testing it. I find the results pretty good although my testing abilities and subjects are not the best.
Chromatic aberrations are present but I think they are small

I would like to see your opinions.

The Canon 70-200 f4 IS USM at f4 and 200mm was used as tube lens. Illumination with two Ikea Jansjo diffused with half ping pong ball around the subject. Canon 7D in LV. Stacked in Zerene PMax
1- Laser printed paper
Whole frame
Image

100% crop near the center
Image

100% crop corner
Image

100% crop. Single shot near the center, subject angled to show LoCA, undiffused light
Image

2- Polipodium sporangia
Whole frame
Image

100% crop near the center
Image

100% crop corner
Image
Pau

SebastianFg
Posts: 16
Joined: Mon Oct 09, 2017 10:24 am
Location: Freiberg, Germany

Post by SebastianFg »

Hello,
I thought Olympus established a System based on 180mm tube lens.
That would improve your results probably.
Best regards,
Sebastian

Pau
Site Admin
Posts: 5130
Joined: Wed Jan 20, 2010 8:57 am
Location: Valencia, Spain

Post by Pau »

You're right, Olympus microscopes have a 180mm tube lens but because I see some corner degradation I find better to use a slightly longer TL. Altering the FL only changes magnification, so (calculated, not yet actually measured) at 200mm I'm getting 4.4X
For subjects where the corners don't matter like a typical insect portrait I could use it down to 140mm providing 3.1X

The objective is designed (and marked) for 26.5mm FN and the Canon APSC image diagonal is 27.04mm so they seem to match very well, but extreme corners are not so good.
Pau

Pau
Site Admin
Posts: 5130
Joined: Wed Jan 20, 2010 8:57 am
Location: Valencia, Spain

Post by Pau »

My conclusion: it's a very good objective, with very good resolution and only some degradation at extreme corners, low CA and very useful WD, not at the level of Mitutoyo but close,
.. and the good news: right now there are five of them at Ebay, I think they could be bought for modest prices as I did.
Pau

WalterD
Posts: 610
Joined: Mon Jul 06, 2015 12:01 pm
Location: Rotterdam, the Netherlands
Contact:

Post by WalterD »

That was an interesting comparison, Pau. Looking forward to see more pictures made through that objective.

Regards,

Walter

Post Reply Previous topicNext topic