Author Topic: 180/2.8 ED Ais with Nikon 5T and 6T diopters  (Read 4846 times)

pluton

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180/2.8 ED Ais with Nikon 5T and 6T diopters
« on: April 06, 2016, 06:55:41 »
Out of curiosity spurred by Tristin, I attached  the Nikon 5T and 6T screw-in diopters to my 180/2.8 ED Ais.  Results are sharper with the 5T wide open, a bit dreamy with the 6T wide open.  Stopped down these combos are usable, IMO.  The flower shot is with the 6T at MinFD at f/5.6
Keith B., Santa Monica, CA, USA

Erik Lund

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Re: 180/2.8 ED Ais with Nikon 5T and 6T diopters
« Reply #1 on: April 06, 2016, 10:58:09 »
Looks like quite OK performance at f/16
Erik Lund

Bjørn Rørslett

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Re: 180/2.8 ED Ais with Nikon 5T and 6T diopters
« Reply #2 on: April 06, 2016, 11:09:51 »
Sometimes performance with these close-up attachments improve if they are mounted in reverse. Always worth a try.

Erik Lund

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Re: 180/2.8 ED Ais with Nikon 5T and 6T diopters
« Reply #3 on: April 06, 2016, 11:39:33 »
The glass elements are cemented together so quite easy to flip in the filter-holder, it's just kept in place by a threaded ring
Erik Lund

Bjørn Rørslett

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Re: 180/2.8 ED Ais with Nikon 5T and 6T diopters
« Reply #4 on: April 06, 2016, 11:50:55 »
I know that - it's more difficult to keep track of which unit has been flipped over in its retaining ring !! Labelling the filter box will not suffice as the close-up attachments are moved a round a lot by their very nature.

The above of course presumes one has several of each, however. My situation unfortunately.

I do agree that making these filter being reversed is a breeze. One just needs a thin and pointed tool to put into the groove of the retaining ring to get it moving.

Erik Lund

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Re: 180/2.8 ED Ais with Nikon 5T and 6T diopters
« Reply #5 on: April 06, 2016, 11:58:30 »
A 'lens spanner' is the word ;)

Yes mark the filter-holder and elements on the side, for instance with 'Front ->'
Erik Lund

Bjørn Rørslett

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Re: 180/2.8 ED Ais with Nikon 5T and 6T diopters
« Reply #6 on: April 06, 2016, 12:02:10 »
I always used a thin flat-blade screwdriver and a small hammer. A lens spanner is of course even better, but the retaining rings of my various Nikon close-up lenses (3T, 4T, 5T, 6T) have been easy to engage and remove.

Akira

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Re: 180/2.8 ED Ais with Nikon 5T and 6T diopters
« Reply #7 on: April 06, 2016, 14:04:33 »
I guess the simple reversing in the original ring might be dangerous sometimes?  The reversed diopter may hit the front element of the master lens...
"The eye is blind if the mind is absent." - Confucius

"Limitation is inspiration." - Akira

Erik Lund

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Re: 180/2.8 ED Ais with Nikon 5T and 6T diopters
« Reply #8 on: April 06, 2016, 14:22:10 »
Life is often dangerous, even for lenses  8)
Erik Lund

Akira

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Re: 180/2.8 ED Ais with Nikon 5T and 6T diopters
« Reply #9 on: April 06, 2016, 14:35:24 »
Life is often dangerous, even for lenses  8)

Yeah, sometimes even a protection filter causes damages to the front element.   :o :o :o
"The eye is blind if the mind is absent." - Confucius

"Limitation is inspiration." - Akira

Bjørn Rørslett

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Re: 180/2.8 ED Ais with Nikon 5T and 6T diopters
« Reply #10 on: April 06, 2016, 14:42:50 »
Normally this problem would be eliminated simply because the curved surface, even when the optics are reversed, rarely protrude outside their massive filter holding ring. I cannot say this has occurred any time with my experiments so far, but of course one cannot rule the issue out completely. Have a look from the side before mounting the filter to see if anything protrudes and act accordingly.

Even less likely a problem if you use adapters to mount hte filter, reversed or not, as the adapter step ring in itself pushes the mounting point further off the lens front.

pluton

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Re: 180/2.8 ED Ais with Nikon 5T and 6T diopters
« Reply #11 on: April 06, 2016, 18:38:08 »
I would have tried it reversed, but lack a 62-62 ring on hand.  The field was amazingly flat in the normal orientation, based on the ruler shots that I did.
Keith B., Santa Monica, CA, USA

Tristin

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Re: 180/2.8 ED Ais with Nikon 5T and 6T diopters
« Reply #12 on: April 06, 2016, 18:43:10 »
Much appreciation Pluton!  Now I know i can safely move on from the 200mm f/4.
-Tristin

Ramon Mena

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Re: 180/2.8 ED Ais with Nikon 5T and 6T diopters
« Reply #13 on: April 06, 2016, 23:31:30 »
Hi Pluton,
Probably you need a ring coupler male to male 72mm to 72mm.
It costs around 7 USD. Please see ebay Item Number 321936135972.
Best regards,
Ramón

pluton

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Re: 180/2.8 ED Ais with Nikon 5T and 6T diopters
« Reply #14 on: April 07, 2016, 08:10:04 »
Hi Pluton,
Probably you need a ring coupler male to male 72mm to 72mm.
It costs around 7 USD. Please see ebay Item Number 321936135972.
Best regards,
Ramón
Ramon, Actually, in this case it'd be 62 to 62, to match the 62mm threads of the 5T/6T.  That would then be threaded onto the 72 to 62 step down ring on the 72mm-threaded 180/2.8.  Unless they make a 72 to 62 double male threaded ring. 
Problem is, the local shops want strangely large amounts of money for adapter rings.  Typically they want US$25 or US$30 for a ring that can be purchased from B&H in New York for US$8 or US$12.
Keith B., Santa Monica, CA, USA