WIng butterfly

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anto74
Posts: 66
Joined: Thu Feb 06, 2020 11:48 am
Location: Italy
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WIng butterfly

Post by anto74 »

Hello,
i'm testin my 20X but maybe my tube lenght from senosr plane to rear lens of Raynox DCR150 is wrong ( now is 210mm)
My Olympus 20X LM Plan FI 20/0.40 BD is 180mm.
I'm very confused :(
Photo:
180 shots - 23X - step 3micron - size area 0,540mm - Sony a6100 - led light lamp
www.antoniodesantis.it/fs/texture.jpg
Antonio


Image

rjlittlefield
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Post by rjlittlefield »

Antonio,

The image looks good.

Because of the way you're using the Raynox, the "20X" objective will actually be giving a little higher magnification, something like 20*(210/180) = 23.3X .

Is something else confusing you?

--Rik

anto74
Posts: 66
Joined: Thu Feb 06, 2020 11:48 am
Location: Italy
Contact:

Post by anto74 »

Thanks Rik :)
My confusion is about tube lenght:
https://www.photomacrography.net/forum/ ... hp?t=41137
Thanks again.
Antonio

rjlittlefield wrote:Antonio,

The image looks good.

Because of the way you're using the Raynox, the "20X" objective will actually be giving a little higher magnification, something like 20*(210/180) = 23.3X .

Is something else confusing you?

--Rik

Ultima_Gaina
Posts: 108
Joined: Sat Jan 28, 2017 11:19 pm

Post by Ultima_Gaina »

anto74 wrote:Thanks Rik :)
My confusion is about tube lenght:
https://www.photomacrography.net/forum/ ... hp?t=41137
Thanks again.
Antonio

rjlittlefield wrote:Antonio,

The image looks good.

Because of the way you're using the Raynox, the "20X" objective will actually be giving a little higher magnification, something like 20*(210/180) = 23.3X .

Is something else confusing you?

--Rik
I suspect that you are using the 210mm tubes provided by WeMacro.

Even if not, here is the discussion on the same subject I had we Rik, who clarified how to precisely measure the exact tube length needed for infinity focus.

https://www.photomacrography.net/forum/ ... c&start=78

You can't obtain the exact tube length from the segments provided by WeMAcro, but if you remove the 10mm segment, you'll end up very close to the ideal length.

anto74
Posts: 66
Joined: Thu Feb 06, 2020 11:48 am
Location: Italy
Contact:

Post by anto74 »

Thanks for info! :)
I'm using Mjkzz.de variable tube kit with Raynox DCR150.
The tube lenght is measured from sensor plane to front or rear lens of DCR150?
Thanks
Antonio
Ultima_Gaina wrote:
anto74 wrote:Thanks Rik :)
My confusion is about tube lenght:
https://www.photomacrography.net/forum/ ... hp?t=41137
Thanks again.
Antonio

rjlittlefield wrote:Antonio,

The image looks good.

Because of the way you're using the Raynox, the "20X" objective will actually be giving a little higher magnification, something like 20*(210/180) = 23.3X .

Is something else confusing you?

--Rik
I suspect that you are using the 210mm tubes provided by WeMacro.

Even if not, here is the discussion on the same subject I had we Rik, who clarified how to precisely measure the exact tube length needed for infinity focus.

https://www.photomacrography.net/forum/ ... c&start=78

You can't obtain the exact tube length from the segments provided by WeMAcro, but if you remove the 10mm segment, you'll end up very close to the ideal length.

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