Hey /p/, I just got my hands on a great deal second hand Nikkor 50mm 1.4G in top shape, adapted it via FTZ II to my Zf body.Everything works fine, AF is spot on, but I can't get it to focus to infinity, even manually it stops at like 30 feet. Of course stopping down kinda gets to an acceptable focus but thats not really great for night shoots.Youtube/google sucks and theres no answers telling me if it could be the adapter and I am missing something or if there's something wrong with the lens that coudl be fixable. Any experiences/ideas? Cheers.
>>4340330I know it's fixable. It happened on a lens I had. You'd need to disassemble the lens and figure out how to re-calibrate the infinity focus point. Or you can probably take it to a shop to have it done.
>>4340334I'm not afraid of dissasembly. It's the assembly that usually gets me. Anyway, any idea what to look for inside? This seems easy to follow https://www.youtube.com/watch?v=flOjvxknw90, but theres nothing related to my issue. I think.
>>4340341>Anyway, any idea what to look for inside?No I don't, I never fixed mine. The lens was very cheap so I just bought another copy rather than putting in the effort. I imagine there are some bolts that tighten down to produce the hard stops. You'll need to find them, loosen them up and re-calibrate it.https://www.youtube.com/watch?v=tJEmMy2wkQENot the same lens, but I imagine that the process is overall similar.
>>4340330>no answers telling me if it could be the adapter and I am missing something or if there's something wrong with the lensYes, there's something wrong with the lens. It's probably been dropped. It's not the adapter.
>>4340345I think I am a genius. I followed this video >>4340341, got to the same stage of dissasembly, fucked around for a bit figuring out how the mechanism works, giving up because there was nothing to adjust from this side of the lens, rebuilt it again, now it works fine and focuses to infinity with no issues whatsoever. Fuck whatever mojo there is.>>4340362 could technically be right - there's no dings or whatnots, the lens is in absolutely pristine condition. But maybe there was something that's gone wrong inside and me just reassembling it worked. Anyway thanks guys lol.
I bought one of these and disassembled/reassembled it twice to try to see if I could fix the back focusing issue with phase detect autofocus. I couldn't. D3400 doesn't have AF fine tuning, so no dice for me. At the very least, I was able to clear out the dust that managed to work itself in between the front and rear lens elements. I didn't see anything obvious that would influence focusing other than a thin spacer on the mount. But even with that removing/adding thickness didn't seem to work for me. I did note that the focusing helix POM parts were worn. Didn't seem like a great design.Were you able to track down a technical manual for the lens? I wasn't able to find one online. And of course N*kon won't make them easily available.
>>4340378cool I'm glad you got it working, maybe something inside the lens was over-tightened or whatever. Either way, I'm glad you got it working. Be sure to test it though. I once also had a lens that could focus past infinity and it fucked up my close focus. So just run it through it's paces and make sure everything is good.
>>4340378Lenses dropped on carpet still decenter or break. Do this test:Stop down to f8Focus on something that would be at “infinity” like a streetlightShoot it in the centerMove your camera to frame it so its in each cornerIf just one corner or side is WAY worse sell the lens. Most lenses will have one corner or side that’s a little worse especially wide open. You’re looking for unbelievably fucked up even at f8. Also try focusing on a pinpoint LED in a dark room, and them defocus and see if it flares to one side. If it has a huge flare to one side when defocused sell your lens.
>>4340330Adaptor problem, The flange distance is not correct. This same issue happens with a lot of converted m42 lens.
>>4340435It's a OEM adapter, that's not the issue unless it came defective out of the factory.
>>4340442>unless it came defective out of the factoryNot impossible for a Nikon.>>4340345>I imagine that the process is overall similarNo, the process is not similar.Ultrasonics don't have hard stops because the manufacturers save money by not calibrating them.
>>4340442The adapter is fine retards>>4340512AF lenses don't have hard stops because autofocus needs to be able to hunt past infinity to confirm it and there needs to be extra slop past that for lens geometry changing with temperature. Intsead of calibrating mechanical stops they have to calibrate the digital distance scale. No money saved, it's just to make the lens work right.Lenses with hard stops do need periodically recalibrated but that happens out of warranty, why would they care?
>>4340560>they have to calibrate the digital distance scaleAutomatically; focus stop calibration requires a human or much more expensive manufacturing equipment.
>>4340566A hard stop is incompatible with autofocus working and can't adapt to temperature shifts.>old tech is worse>No, it's a conspiracy!Thinking like this is going to be recognized as a mental disorder someday. Threat recognition system stuck running on such high alert that it thinks an improvement in lens design is an industry wide conspiracy to charge the same for less value. No, the electronics in an AF lens are worth far more and calibrating a mechanical lens would be fully automated anyways. If anyone is charging you more for hard stops they're actually the one ripping you off. A lens can be automatically calibrated just by running autofocus against distance targets. Easily automated these days.
>>4340574>A hard stop is incompatible with autofocus workingOnly CDAF.>charge the same for less valueI didn't claim that.>A lens can be automatically calibrated just by running autofocus against distance targets. Easily automated these days.That's what I said, providing it doesn't have hard focus stops.
>>4340581You must admit it's not to save money.It's so autofocus works, and it costs more money to make an electronic lens than have an electronic machine secure and align focus scales on many mechanical lenses without any electronic components.Pre-CDAF autofocus lenses still had their infinity stop significantly past infinity. To allow for temperature variations and hunting past infinity to return to it.
>>4340585>Pre-CDAF autofocus lenses still had their infinity stop significantly past infinityHave you ever held a Pre-USM Canon or AF(-D) Nikon?
>>4340586Have you never used minolta/pentax brandho
>>4340585>Pre-CDAF autofocus lenses still had their infinity stop significantly past infinityThe real reason is for infrared photography
>>4340415It can focus a small bit past the infinity (feels like a milimeter on the focus ring), but the close focus (0.45m) looks right to me too. I think I won't worry anymore, it does what I need it to do and I guess the AF is happier if it can confirm the infinity focus like >>4340560 and >>4340574 said. >>4340412Nope. I just watched the video I posted and then found another one from a russki dude who seems to completely take it apart. Hard to say why he does what he does cause I don't really understand russian anymore, but maybe it could help you anyway - https://www.youtube.com/watch?v=l56kNUO_mds>>4340420I think it's fine. Tried a few shots with my phone as a light source in the corners and I didn't notice anything that I would consider bad.>>4340435No>>4340442Yeah the adapter is not at fault
>>4340587I own a couple Minolta lenses.What's your point?
>>4340722Owning /=/ using gearfag
>>4340746I haven't gotten around to setting the memory card up yet.
