Nikon M plan 20 0.40 ELWD + Rodagon 150mm f5,6

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jurkovicovic
Posts: 81
Joined: Sun Jul 16, 2017 11:16 am

Nikon M plan 20 0.40 ELWD + Rodagon 150mm f5,6

Post by jurkovicovic »

Sometimes I would like to use a 20x objective at 15x, but the image circle is too small, so it is not usable for me.
I read somewhere (I can't remember where...) that a tube lens could improve the performance of the finite objective.
So i did test of combo, what if ...
I'm pleasantly surprised and I can write that in that case it seems to me that it works.
I used a Rodagon 150mm f5.6 as a tube lens and a Nikon M plan 20 0.40 ELWD 210/0 with a 10MP APSC sensor.
I compared it to Nikon without a tube lens.
Nikon M plan ELWD 20 0.40 210/0 + Rodagon 150mm f5,6
Nikon M plan ELWD 20 0.40 210/0 + Rodagon 150mm f5,6
Nikon M plan ELWD 20 0.40 210/0 + Rodagon 150mm f5,6<br />center
Nikon M plan ELWD 20 0.40 210/0 + Rodagon 150mm f5,6
center
Rodagon is focused almost on infinity - extension about 145mm, magnification about 14x.
Nikon M plan ELWD 20 0.40 210/0<br />center
Nikon M plan ELWD 20 0.40 210/0
center
Nikon M plan 20 0.40 ELWD 210/0 is extended to about 155mm, magnification is about 15x.
So the output is a bit bigger.
The performance seems quite similar to me, but Nikon itself shows more CA.
Nikon M plan ELWD 20 0.40 210/0 + Rodagon 150mm f5,6<br />corner
Nikon M plan ELWD 20 0.40 210/0 + Rodagon 150mm f5,6
corner
Nikon M plan ELWD 20 0.40 210/0<br />corner
Nikon M plan ELWD 20 0.40 210/0
corner
Photos of the corners show that Nikon is weak at 15x and also that Rodagon improves it a lot, even 14x.
100% crops, several stacked images from converted raw without editing.
Maybe it will help someone :)
canon EOS *

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