E-Mount (NEX) adapters |
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ryansholl ![]() Senior Member ![]() Joined: 10 February 2010 Location: United States Status: Offline Posts: 787 |
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I have done exactly that in creating an adapter with a filter mount inside. Built mine to take 1.25" astronomical filters.
With the lens that I have (Samyang 14) it will not allow focus at infinity (on my nex7 with hot filter intact). Are you planning on not removing the shims under the sensor when you remove the IR filter to take care of the rear element to sensor distance issue? Take note that this may not allow infinity focus without a filter in place. |
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Alex H ![]() Senior Member ![]() Knowledgebase Contributor Joined: 06 November 2008 Country: Sweden Location: Stockholm Status: Offline Posts: 1591 |
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Putting thick IR filter inside the adapter in my experience compensates enough for the absence of ICF in the NEX. |
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Ultraviolet-induced visible fluorescence photography - A7, A77, NEX6, NEX6-FS - Gallery
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ryansholl ![]() Senior Member ![]() Joined: 10 February 2010 Location: United States Status: Offline Posts: 787 |
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Thanks for that note Alex. With or without the sensor shims?
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Alex H ![]() Senior Member ![]() Knowledgebase Contributor Joined: 06 November 2008 Country: Sweden Location: Stockholm Status: Offline Posts: 1591 |
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I seem to have missed Your comment, Ryan.
If I remember correctly, NEX-5N sensor does not have any shims.At least I can not find any shims on my pictures NEX-5N disassembly. Unlike in DSLR, having main sensor autofocus negates the need to calibrate exact sensor position. All You need is to have lenses that will focus past infinity. For example, Sony NEX mount 16mm lens will focus to infinity even on the camera without ICF. |
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Ultraviolet-induced visible fluorescence photography - A7, A77, NEX6, NEX6-FS - Gallery
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cvicisso ![]() Groupie ![]() Joined: 02 June 2012 Country: United States Location: United States Status: Offline Posts: 56 |
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Ryan - thanks. When I started on this quest, I originally had the same question, as other IR-photography related sites mentioned that the filter must be replaced with a piece of [appropriate] clear glass in order to account for new sensor-to-rear-element distance. Alex H and others seem to have pulled it off without this [difficult] step and it still seems to work. Which gave me hope! ![]() It seems (from your post) that a change in the diffraction properties of the medium (ie. light traveling through glass/filter instead of air) will affect the focal distance between the rear element of the lens and the sensor. This makes perfect sense. I assume you've already tried this, but does your Samyang lens allow [manually] focusing BEYOND (past) infinity? I'm wondering if this might allow for the correct readjustment of the focal distance change made by insertion of the filter element. |
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NEX-6 | NEX-3 | E PZ 16-50 | 16/2.8 | VCL-ECU1 | VCL-ECF1 | LA-EA2 | | Maxxum 7 | 50/1.7 | 70-210/4 Beercan |
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cvicisso ![]() Groupie ![]() Joined: 02 June 2012 Country: United States Location: United States Status: Offline Posts: 56 |
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It looks like you hit send while I was still typing! |
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NEX-6 | NEX-3 | E PZ 16-50 | 16/2.8 | VCL-ECU1 | VCL-ECF1 | LA-EA2 | | Maxxum 7 | 50/1.7 | 70-210/4 Beercan |
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Bob J ![]() Admin Group ![]() Dyxum Administrator Joined: 23 December 2005 Country: United Kingdom Location: London Status: Offline Posts: 27337 |
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Does anyone have any recommendation for a Contax G to NEX adapter?
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RBJ ~ Moderation on Dyxum
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Alain ![]() Senior Member ![]() Joined: 14 October 2005 Location: Belgium Status: Offline Posts: 364 |
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Am I correct that it's price is approx. $360? |
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MichaelMeyer ![]() Groupie ![]() Joined: 27 May 2011 Location: Brooklyn, NY Status: Offline Posts: 78 |
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Yes, the cost was roughly $360. I don't remember off the top of my head if that included shipping or not.
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Alain ![]() Senior Member ![]() Joined: 14 October 2005 Location: Belgium Status: Offline Posts: 364 |
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Thanks |
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pegelli ![]() Admin Group ![]() Dyxum Administrator Joined: 02 June 2007 Country: Belgium Location: Schilde Status: Offline Posts: 38587 |
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But I stumbled on this thread in GetDPI who even talks about an AF capable adapter. Reading through it should be available now. |
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oldman ![]() Groupie ![]() Joined: 06 June 2012 Country: United States Location: Bellingham, WA Status: Offline Posts: 42 |
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I have four adapters. One is a generic ebay noname adapter and the other three are all Fotodiox adapters. These have a little better build quality but all of them are less than "silky" and have rough spots. I find myself getting near critical focus and twisting the focus ring back and forth a half inch to loosen it up at the critical point. This probably sounds worse than it is but when you are used to smooth silky well dampened motion this is more like grinding meat. It is worth it for the lenses. |
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Zeiss, Leica, Canon, Voigtlander lenses |
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MiPr ![]() Admin Group ![]() Mikre Dyxum Administrator Joined: 25 August 2006 Country: Poland Location: Wroclaw Status: Offline Posts: 22296 |
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OK, quick info about adapters I have:
1) M42 adapter - noname brand (some Chinese production), 2) M39 one - same as above, 3) Minolta AF (fourth photo on the main post) - borrowed from Bob (thanks!) just to see how it works and whether I would be comfy with it. So, let me start with the #3 - it's solid, it's smart, it works perfectly. The aperture "ring" works very well - it's pleasure to use, although without any f-stops marked so the aperture is a guess. I think that this solution is better to "step down when taking a shot" approach. The aperture lever, opposite to how it is done on the camera body and on the lens, is not "flat" but just a small rod. This makes problems when trying to use some non-alpha stuff on this adapter, e.g. Alpha-M42 adapter does not work. I think this could be worked around by using a file on it (I mean - not on your adapter Bob ![]() The other disadvantage is that it is not chipped. Not a huge problem but you will not know what lens was in use. Oh well, nothing is perfect. As for the #1 and #2 - both adapters are very similar: black-coloured aluminum with an "inset" where you screw-in your lens. This inset is mounted to the adapter using three screws and after getting them a bit loose you can turn the inset around. This allows you to position the lens correctly (usually not a problem unless you want to use e.g. Zenitar 16/2.8 which has integrated lens hood). Everything is solid, mounts easily and generally I'm quite happy with them. Or better to say - I was happy because after today's walk I found a big surprise: namely the M42 adapter is way too short ![]() Previously I have not noticed it because I was shooting close-up scenes with macro ext rings. But for today's walk I took Mir 1W (37/2.8) and I immediately noticed that the lens focuses at infinity when the scale shows ... 1.7m! So it was clear that the adapter is too short. At least good that this is this way and not opposite. After returning home I took my caliper and performed some measurements. The flange for E-mount is 18mm so we have following:
As you can see all three adapters are too short comparing to what they should be. In case of Bob's adapter and M39 it is not disastrous - only 0.2mm - but still there should be no difference. In case of my M42 the difference is quite pronounced and quite noticeable when focusing (remember - infinity at 1.7m!). Hopefully the construction of the M42 and M39 adapters allow to fix the issue quite easily by removing the inset and putting some separator under it. Still, I believe that this is not a rocket science to produce a piece of metal pipe with the tolerance of 0.1mm so I'm astonished with such inaccuracy ![]() p.s. No, my caliper was not Chinese ![]() |
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MiPr ![]() Admin Group ![]() Mikre Dyxum Administrator Joined: 25 August 2006 Country: Poland Location: Wroclaw Status: Offline Posts: 22296 |
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Ahh, I've forgotten to add one observation about using Minolta AF lenses: manual focusing is really cumbersome on some of them. I mean: the focus ring is not smooth - if you need to move it a tiny bit it becomes "jumpy", i.e. you have to apply some more force to move it and it jumps further than intended. This especially concerns second-gen Minolta lenses, e.g. 70-210/3.5-4.5 or 75-300/4.5-5.6. Comparing those lenses to their first-gen counterparts, e.g. beercan and big beercan there is a huge difference: first-gens are smooth and nice to operate ...
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I'm noise-blind. And noise-about-noise-deaf too ... | BTW, Dyxum Weekly Exhibitions don't grow on trees ...
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