Author Topic: How to get non-AI Nikkors converted?  (Read 73482 times)

f4-fan

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Re: How to get non-AI Nikkors converted?
« Reply #105 on: January 14, 2020, 06:43:38 »
If you don't want to do it yourself, take the aperture ring off as Asle said, and send it to Marcel Van Engen - he is a member here (MarcelvanEngen). His website is here:

https://magnimopus.com/services/

He can do a professional AI conversion which preserves the original appearance of the lens. While home AI conversions may be functional (assuming you file the aperture ring correctly) many are quite ugly and may reduce the resale value.

Thats just the information, I need  :)
I will contact him...
Thanks
Ralf
Leverkusen, NRW, Germany
"Camera Moralia - Digicams for Social Justice!" - an initiative of https://www.fotogemeinschaft.de .

MarcelvanEngen

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Re: How to get non-AI Nikkors converted?
« Reply #106 on: January 17, 2020, 17:25:42 »
Thank you Roland. :D
And thanks Ralf for reaching out to me. Glad you are not opting for the hack, cut, file method yourself.
These lenses are beautifully made and to see some of the ugly diy jobs just  :'(

f4-fan

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Re: How to get non-AI Nikkors converted?
« Reply #107 on: January 17, 2020, 19:33:22 »
Thank you Roland. :D
And thanks Ralf for reaching out to me. Glad you are not opting for the hack, cut, file method yourself.
These lenses are beautifully made and to see some of the ugly diy jobs just  :'(

On the one hand, I don't have suitable tools, on the other hand, I would be afraid that iron shavings would come onto the lenses.

I am very excited to see how well the adapted Micro Auto works on the D850.
Will it be better than the AF Micro 55mm 2.8 ? (a cheap Alternative)

On the Canon 5D MK 2+3 I had extremly sharp macros with the Micro Auto and a cheap chinese adapter...

Ralf
Leverkusen, NRW, Germany
"Camera Moralia - Digicams for Social Justice!" - an initiative of https://www.fotogemeinschaft.de .

Roland Vink

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Re: How to get non-AI Nikkors converted?
« Reply #108 on: January 19, 2020, 21:44:44 »
Be aware that Micro-Nikkor Auto 1:3,5 f=55mm no 190605 is a "compensating" lens. It was designed for use with an external light meter at a time when cameras did not have through-the-lens (TTL) light meters. When the lens is stopped down to f/5 and smaller, as the lens is focused close, the aperture opens to compensate for the light that would usually be lost due to extension (bellows factor). At the 1:2 setting the aperture opens a full stop compared to infinity. Compensation is obviously not possible when the lens is used at wider apertures since the lens cannot open wider than full aperture as the lens is focused closer.

Compensation was very convenient for cameras without TTL metering since they didn't need to adjust the shutter speed or aperture when focusing at different distances.  However, for cameras with TTL meters, you need to counter-compensate since the TTL meter automatically compensates for light lost due to extension. That is why in the late 1960s when TTL metering was common, the original 55 micro was replaced with the Micro-Nikkor-P without compensation. If you intend to use TTL meters, the non-compensating versions are much more convenient.

Will it be better than the AF 55 micro? The original 55 micro has a reputation for being very good at close range (not so good at infinity), but the newer lens has much better coatings for improved contrast, and it has floating elements so it should perform well at any distance. Manual handling of the AF lens is perhaps not so nice due to the narrow plastic focus ring.

Birna Rørslett

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Re: How to get non-AI Nikkors converted?
« Reply #109 on: January 19, 2020, 22:10:59 »
--- Manual handling of the AF lens is perhaps not so nice due to the narrow plastic focus ring.

The understatement of the day :)

The AF 55 is a rattling affair with no love lost to it.

f4-fan

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Re: How to get non-AI Nikkors converted?
« Reply #110 on: January 19, 2020, 22:13:21 »
Be aware that Micro-Nikkor Auto 1:3,5 f=55mm no 190605 is a "compensating" lens. It was designed for use with an external light meter at a time when cameras did not have through-the-lens (TTL) light meters. When the lens is stopped down to f/5 and smaller, as the lens is focused close, the aperture opens to compensate for the light that would usually be lost due to extension (bellows factor). At the 1:2 setting the aperture opens a full stop compared to infinity. Compensation is obviously not possible when the lens is used at wider apertures since the lens cannot open wider than full aperture as the lens is focused closer.

Compensation was very convenient for cameras without TTL metering since they didn't need to adjust the shutter speed or aperture when focusing at different distances.  However, for cameras with TTL meters, you need to counter-compensate since the TTL meter automatically compensates for light lost due to extension. That is why in the late 1960s when TTL metering was common, the original 55 micro was replaced with the Micro-Nikkor-P without compensation. If you intend to use TTL meters, the non-compensating versions are much more convenient.

Will it be better than the AF 55 micro? The original 55 micro has a reputation for being very good at close range (not so good at infinity), but the newer lens has much better coatings for improved contrast, and it has floating elements so it should perform well at any distance. Manual handling of the AF lens is perhaps not so nice due to the narrow plastic focus ring.

Thanks for your hints. Compensation of this lens should not be so problematic, because  I can use bracketing. I will never use this lens for high speed photography  ;)

By the way: One can use it also for 'rather sharp' portraits (Micro-Nikkor Auto 1:3,5 f=55mm with Canon 5D MK 3):




 
Ralf
Leverkusen, NRW, Germany
"Camera Moralia - Digicams for Social Justice!" - an initiative of https://www.fotogemeinschaft.de .

Birna Rørslett

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Re: How to get non-AI Nikkors converted?
« Reply #111 on: January 19, 2020, 22:59:52 »
It's not difficult to remove the internal cam that does the compensation of aperture ... Once removed, you can use the lens in a straightforward manner.

f4-fan

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Re: How to get non-AI Nikkors converted?
« Reply #112 on: January 29, 2020, 22:09:14 »
If you don't want to do it yourself, take the aperture ring off as Asle said, and send it to Marcel Van Engen - he is a member here (MarcelvanEngen). His website is here:

https://magnimopus.com/services/

He can do a professional AI conversion which preserves the original appearance of the lens. While home AI conversions may be functional (assuming you file the aperture ring correctly) many are quite ugly and may reduce the resale value.

Marcel has now modified my Micro Nikkor Auto 55mm f/3.5 very elegant and I can use it on my D850 with metering. Thanks a lot. Marcels Service gives a very good value and is less expensive than the freight-costs from Germany to GB (:-). And – also important: Marcel is extremely friendly and competent. From now on I will send every old lens, I can get, to him for modification ...
 :)
Ralf
Leverkusen, NRW, Germany
"Camera Moralia - Digicams for Social Justice!" - an initiative of https://www.fotogemeinschaft.de .

f4-fan

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Re: How to get non-AI Nikkors converted?
« Reply #113 on: January 29, 2020, 22:15:31 »
It's not difficult to remove the internal cam that does the compensation of aperture ... Once removed, you can use the lens in a straightforward manner.

Is it possible, to  modify the M-Extension Ring for my modified Micro Nikkor Auto? I don't want to buy the PK-13 because it is quite expensive in Germany.

Marcel van Engeren wrote:

"The operation of the lens with the extension remains the same as it was. The M extension tube does not rotate with the movement of the aperture.
An extension tube like the PK13 will actually follow the aperture ring setting of the lens and communicates with the camera tab.
This might be something to look for. And the best thing is that the meter tab of the PK13 falls into the modification slot I made on your lens so it works even in combi with the PK13 extension tube!"
Ralf
Leverkusen, NRW, Germany
"Camera Moralia - Digicams for Social Justice!" - an initiative of https://www.fotogemeinschaft.de .

Birna Rørslett

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Re: How to get non-AI Nikkors converted?
« Reply #114 on: January 29, 2020, 22:34:51 »
The M rings will only allow stopping down, no aperture follower there. Thus PK-13 is to be preferred. Buy them second-hand, as I do, for a reasonable price. For example this offer:
https://www.ebay.co.uk/itm/Nikon-PK-13-Extension-Tube-F-Mount-Excellent-from-Tokyo-Japan/183767574393?hash=item2ac966a779:g:S2UAAOSwxXJckdrw

Matthew Currie

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Re: How to get non-AI Nikkors converted?
« Reply #115 on: January 30, 2020, 06:19:38 »
If you happen to luck into them, you might also look at the older Vivitar sets.  Vivitar sold two versions of a three-part set, with 12, 20, and 36 mm. tubes.  Unlike current ones, the old ones were nicely made and all metal.  I have two sets, both of which work well.  The( Pre-AI)  AT-3 won't take an AI lens on the 12 mm. ring, but will on the others.  The skirt safely allows mounting on an AI camera, though of course you must stop down meter.   The  AT-3AI works fine on all cameras but can't readily accept rabbit ears, so stop down metering on a pre-AI camera.  Both have nice smooth automatic aperture mechanisms, and I have routinely used the full 68 mm. on my 200/4Q lens for bug chasing, with no ill effects.

If you can get the Nikon ones cheaply enough, and especially if the PK 13 is all you need,  I wouldn't bother to hunt too hard for the Vivitars, but if you bump into them they're worth a look.




















f4-fan

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Re: How to get non-AI Nikkors converted?
« Reply #116 on: January 30, 2020, 07:47:33 »
If you happen to luck into them, you might also look at the older Vivitar sets.  Vivitar sold two versions of a three-part set, with 12, 20, and 36 mm. tubes.  Unlike current ones, the old ones were nicely made and all metal.  I have two sets, both of which work well.  The( Pre-AI)  AT-3 won't take an AI lens on the 12 mm. ring, but will on the others.  The skirt safely allows mounting on an AI camera, though of course you must stop down meter.   The  AT-3AI works fine on all cameras but can't readily accept rabbit ears, so stop down metering on a pre-AI camera.  Both have nice smooth automatic aperture mechanisms, and I have routinely used the full 68 mm. on my 200/4Q lens for bug chasing, with no ill effects.

If you can get the Nikon ones cheaply enough, and especially if the PK 13 is all you need,  I wouldn't bother to hunt too hard for the Vivitars, but if you bump into them they're worth a look.

Even cheaper: I simply unscrewed the little compensation-mechanism on the old but mechanical perfect M-Extension Ring and taped the little screw holes... Now I can use it and change the aperture. ;D
Ralf
Leverkusen, NRW, Germany
"Camera Moralia - Digicams for Social Justice!" - an initiative of https://www.fotogemeinschaft.de .