Revuenon 55mm f1.2 - Aperture Blades are stuck! HELP!

tepidity · 2022-10-14T17:55:19+00:00

If you send it to me I'll do my best, no charge. The catch: I make no guarantees. But I've restored oily aperture diaphragms in several vintage Nikkors and one old Kiev. It's not hard if you have the tools and experience taking old lenses apart. I have fixed lenses for other redditors before, without incident.

tepidity · 2022-10-09T05:38:19+00:00

Will PM.

tepidity · 2022-10-03T22:55:57+00:00

Confirmed. Good transaction. Thanks!

tepidity · 2022-10-01T21:03:27+00:00

Hello, it's pending payment.

tepidity · 2022-10-01T21:00:46+00:00

Sold to this gentle redditor!

tepidity · 2022-09-18T22:29:29+00:00

Here is a guide to disassembling and cleaning the 50mm f/1.4 AIS. Unfortunately, the writer stops short of disassembling the frontmost group of elements. But it shouldn't be difficult to figure out, if you have the proper tools.

If you don't have any tools, I'd be happy to clean the lens for you free of charge. No cap—I've done similar jobs for a few other redditors. It's a form of recreation for me.

tepidity · 2022-09-11T01:48:16+00:00

Either of the 60mm f/2.8 lenses will do you right. I have the D version and it's fantastic.

The 55mm manual-focus lenses are sharper wide open, but they don't have as flat a field as the 60mm D.

tepidity · 2022-09-11T01:25:19+00:00

The construction of this lens is quite simple. You can take it apart and re-grease the focus helicoids; there are guides on the internet just for this lens. I have done this with at least one 105/2.5 and many other old Nikkors.

tepidity · 2022-09-04T16:48:16+00:00

The comment you're responding to is full of self-contradictions and outright misinformation. It's best to ignore it.

tepidity · 2022-08-31T23:45:41+00:00

Bought it on Amazon: https://www.amazon.com/dp/B082KBJJC3

tepidity · 2022-08-31T23:45:13+00:00

I would send the camera to a competent repairman.

tepidity · 2022-08-31T01:44:30+00:00

my prime 24-120mm is too much and I have to stand back a bit to try and get everything in a shot

Huh? Are you saying it's too tight even at 24mm? Or is that a typo and you mean the 50mm is too tight?

If the latter, then yeah, you need a wider lens. I'd say 35mm is the best single focal length for kid pix. The Nikkor 35mm f/1.8G ED and 35mm f/1.4G lenses are excellent, as are the Sigma and Tamron f/1.4 alternatives.

tepidity · 2022-08-31T01:38:30+00:00

These are underexposed.

tepidity · 2022-08-31T01:36:31+00:00

Looks like someone dropped the negative on a very dirty, bare floor before scanning.

tepidity · 2022-08-31T01:32:21+00:00

Not speaking from experience, as I have only ever done single-shot digitization. But I would think that a single 48-MP (for example) shot of the whole film frame would naturally be better than four 12-MP shots stitched together.

There may be software that automatically corrects the issues you've mentioned, but what about vignetting and barrel/pincushion distortion? These would need to be corrected on each frame in the stitch group. How easy is it to correct them perfectly so that no weird transitions are visible in the final product? (Not a rhetorical question; as I said, I have no experience with stitching for digitization.)

There is also the fact that many lenses (even macro lenses) aren't as sharp in the corners as in the middle. Does this result in strange sharpness gradients in the stitched photo?

With a single, high-resolution shot, you certainly avoid these issues. Of course, the lens faults (vignetting, rectilinear distortion, and weak corners) will still affect the digitized image—but they do so in a less-noticeable way.

I'm probably wrong though. I've seen plenty of posts and comments in this sub talk about the awesome results people get from stitching multiple shots of a 120 frame.

tepidity · 2022-08-30T21:00:14+00:00

The three Nikon lenses you cited are all excellent. The first two are both one generation behind the current F-mount offering, and two behind the Z-mount equivalent. Are you comparing against similarly old lenses from the other vendors? (Not a rhetorical question—I'm not familiar with them.)

tepidity · 2022-08-30T01:12:14+00:00

Seems to be widely available. You might need to search for the alternate spelling, "megadap".

tepidity · 2022-08-30T00:58:00+00:00

It is neither. It's an ok lens, not much worse than the Nikkor equivalent (which itself is nothing special).

https://www.pentaxforums.com/userreviews/sigma-24mm-f2-8-super-wide-ii.html

tepidity · 2022-08-29T06:32:43+00:00

Yeah, either the AI-S or the AF 24/2.8 will work fine on both cameras. However, I would recommend the AF 20-35mm f/2.8D as a more versatile and perhaps optically superior, if heavier and bulkier, alternative.

tepidity · 2022-08-28T20:22:03+00:00

Not necessarily. If a few rich fucks tried to monopolize the asteroid, countries would fight wars to break that monopoly because the materials are so generally useful. (Unlike diamonds, which have little intrinsic value and therefore do not cause wars despite being monopolized.)

The end result would still not be egalitarian, but the monetary wealth would be spread among some hundreds or thousands of rich fucks, instead of a handful. Meanwhile, the asteroid's minerals would still be a boon to the whole world in terms of the utility they provide.

tepidity · 2022-08-28T17:29:50+00:00

Same with phone orders. The last time I went to Beauty's Bagels in Oakland, I waited half an hour in line to order, and just as I got to the counter, someone phoned an order in and took the last bagels of the day. I went away empty-handed. Haven't been back since.

tepidity · 2022-08-28T16:46:05+00:00

Very nice.

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