NikonGear'23

Gear Talk => Lens Talk => Topic started by: Fons Baerken on December 10, 2019, 17:14:49

Title: Nikkor K 400mm ED f/5.6 ai converted sn 261124
Post by: Fons Baerken on December 10, 2019, 17:14:49

(https://live.staticflickr.com/65535/49199436986_a78ffa53ba_o.jpg)

Lens apertures allready close down into a pinhole lens at f/11

Title: Re: Nikkor K 400mm ED f/5.6 ai converted sn 261124
Post by: Birna Rørslett on December 10, 2019, 17:33:36

A given case for our Esteemed Dr. Lens. Aka Erik.

Title: Re: Nikkor K 400mm ED f/5.6 ai converted sn 261124
Post by: Frank Fremerey on December 10, 2019, 21:25:38

Quote from: Fons Baerken on December 10, 2019, 17:14:49

(https://live.staticflickr.com/65535/49199436986_a78ffa53ba_o.jpg)

Lens apertures allready close down into a pinhole lens at f/11

is that the lens we bought in Den Haag?

Title: Re: Nikkor K 400mm ED f/5.6 ai converted sn 261124
Post by: Jack Dahlgren on December 10, 2019, 21:56:04

Quote from: Fons Baerken on December 10, 2019, 17:14:49

(https://live.staticflickr.com/65535/49199436986_a78ffa53ba_o.jpg)

Lens apertures allready close down into a pinhole lens at f/11

It has a long lever to activate the aperture. You might try taking off the ring and see if it is bent or caught. I converted mine with the appropriate AI ring and it was quite simple.

Title: Re: Nikkor K 400mm ED f/5.6 ai converted sn 261124
Post by: Fons Baerken on December 11, 2019, 07:13:40

Quote from: Birna Rørslett on December 10, 2019, 17:33:36

A given case for our Esteemed Dr. Lens. Aka Erik.

Will go to Copenhagen some time next year.

Quote from: Frank Fremerey on December 10, 2019, 21:25:38

is that the lens we bought in Den Haag?

Yes.

Quote from: Jack Dahlgren on December 10, 2019, 21:56:04

It has a long lever to activate the aperture. You might try taking off the ring and see if it is bent or caught. I converted mine with the appropriate AI ring and it was quite simple.

I may try but not tinker, need a japan tool set first.

Thanks for the responsees.

Title: Re: Nikkor K 400mm ED f/5.6 ai converted sn 261124
Post by: Erik Lund on December 11, 2019, 08:44:17

Let's see pictures of the lens aperture Fons, fully open and then for each aperture as you stop it down,,,
Remember many Ai lenses are not linear like Ais lenses are, so if you use the aperture wheel on the camera instead of the aperture ring on the lens, this can happen,,, ;)

Title: Re: Nikkor K 400mm ED f/5.6 ai converted sn 261124
Post by: Fons Baerken on December 11, 2019, 12:50:00

Quote from: Erik Lund on December 11, 2019, 08:44:17

Let's see pictures of the lens aperture Fons, fully open and then for each aperture as you stop it down,,,
Remember many Ai lenses are not linear like Ais lenses are, so if you use the aperture wheel on the camera instead of the aperture ring on the lens, this can happen,,, ;)

Thank you Erik.

Aperture 5.6 seems normal, f8 is half the size, f11 shows but a pinhole, smaller settings one sees through the blades at the side. There's some slight bruising on one of the blades.

I will take some pictures of the different aperture settings.
The lens is not chipped how can there be aperture control on the camera but by clicking the aperture ring on the lens.

Title: Re: Nikkor K 400mm ED f/5.6 ai converted sn 261124
Post by: Erik Lund on December 11, 2019, 15:00:07

For my part it was a matter of ruling out various fault causes  ;) Could easily have been Dandelion chipped  8)

Title: Re: Nikkor K 400mm ED f/5.6 ai converted sn 261124
Post by: Fons Baerken on December 13, 2019, 13:03:42

Apertures seems to have returned to what they should be this morning, strange?!

(https://live.staticflickr.com/65535/49213006897_9eda9e8485_o.jpg)

There seems to be some damage on one of the blades maybe this causes friction and halt the blades from normal functioning at times.The light blobs are from pointing a flashlight into the barrel.

(https://live.staticflickr.com/65535/49213006857_055c8462a7_o.jpg)

Not the best shot but at f16 to show the apertures seem to be working again ???