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22 votes
Accepted

What is this old 50mm f/1.9 lens?

Your lens is a Yashica ML 50mm f/1.9. The one pictured below is a more recent version of the same lens. The mount is the CONTAX/Yashica mount. Yashica revived the Contax name over a decade after ...
Michael C's user avatar
  • 175k
15 votes

Does a large mount diameter really allow design advantages for large aperture lenses?

First: Sony doesn't necessarily disagree with Nikon's claim. It's just that Sony designed their 'E' mount with a throat diameter of 46.1 millimeters at a time when it appeared it would be an APS-C ...
Michael C's user avatar
  • 175k
14 votes

How to fix a bent lens mount hook/tab?

The first thing you need to ask yourself is, "Am I sure the only damage to the lens is to the mounting flange?" The second thing you need to ask yourself is, "Considering the cost of a new EF 75-...
Michael C's user avatar
  • 175k
10 votes

How to fix a bent lens mount hook/tab?

Check if you can somehow get this replaced/repaired for free by some expert due to warranty, insurance, etc. That would be the best solution. Find out the price that an expert repair costs or at least ...
null's user avatar
  • 8,514
10 votes

Does a large mount diameter really allow design advantages for large aperture lenses?

Using your thumb and forefinger on each hand, make a finger frame, and hold it out at arms length. Now imagine that your entire field of view is limited by the bounds of this finger frame. Anything ...
scottbb's user avatar
  • 32.9k
9 votes

What is this old Zeiss Tessar lens, with a large mount ring with six holes?

This is a "process" lens used to make copies on high contrast film for reproduction in newspapers, magazines, and books. The lens mounted on a square wood board with hole for the lens. The lens ...
Alan Marcus's user avatar
  • 39.3k
8 votes
Accepted

What makes RF lenses better than Canon's EF lenses?

Like most mirrorless systems, the RF mount has relatively short flange focal distance, of only 20mm, as opposed to 44mm of EF (and EF-S). This has a number of optical advantages, better allows for ...
mattdm's user avatar
  • 143k
7 votes

If my Nikon DSLR camera came with a non-VR lens, do I need to buy a new camera to use VR lenses?

Your camera is an interchangeable lens camera. You can buy other lenses with the Nikon mount and use any of them. That includes lenses with VR — vibration reduction — even if the lens which came with ...
mattdm's user avatar
  • 143k
7 votes

What lens mount does my Fujinon135 f/3.5 lens have?

X-Fujinon says it all - that's Fujica X-mount, the one Fuji used on their SLR cameras from the early 1980s, before current mirrorless X-mount. Fujica X-mount has focal flange depth of 43.5mm, so ...
elkarrde's user avatar
  • 416
7 votes
Accepted

APS-C lenses on full frame Mirrorless bodies

The EF-S to RF adapter is only possible because of the very short Flange focal distance of 20mm of the RF mount compared to the 44mm of the EF and EF-S mounts. The adapter places the EF-S mount lens ...
Mike Sowsun's user avatar
  • 12.3k
7 votes

APS-C lenses on full frame Mirrorless bodies

Since the adapter moves the lenses further from the sensor, I’d imagine that the coverage of the lens would be larger, and that the adapter or body alters focus to compensate. Is this thinking correct?...
Michael C's user avatar
  • 175k
7 votes

Nikon 18-300mm will not mount to body

I just found the issue, upon closer examination of where on the ring it was not seating, ONE slightly loose screw! Hope this helps someone else!
Tonya Moon's user avatar
6 votes
Accepted

Will a DX lens have severe vignetting on a 20x20mm?

The only guarantee is that a DX lens will throw an image circle approximately large enough to cover a DX sensor. Some throw them a bit larger, but the only way you'll know if a given lens does that ...
Blrfl's user avatar
  • 5,582
6 votes

Where can I find the maximum camera weight for my lens?

It's not just the weight of the camera that's a concern, but the torque that it will apply to the mounting ring on the lens (and in the camera, of course). Torque is turning force, and it's ...
Caleb's user avatar
  • 31.7k
6 votes

What mount system is this Hanimex zoom lens?

This lens was manufactured in the Canon FD (and new FD), Nikon F, Minolta M/MD, Pentax K, Fujika FX, CONTAX/Yashica (C/Y or Y/C), Konica AR, Olympus OM, and M42 mounts. Your lens is not any of those. ...
Michael C's user avatar
  • 175k
6 votes

Can I adapt an E-mount rectilinear lens on a micro four thirds body?

I would suggest looking into a shift or tilt-shift adapter, to mount say a wide-angle Canon EF or Nikon AF-S lens. This way, you have a much wider selection of regular lenses to choose from than just ...
scottbb's user avatar
  • 32.9k
6 votes

Why are all the mirrorless full-frame 35mm f/1.4 lenses so big?

Non-retrofocus, close to the "thin lens equation", strong wide angle designs (where the light comes in wide angle and goes out wide angle) are known to be tricky and unreliable in their results when ...
rackandboneman's user avatar
6 votes
Accepted

What is the breech mount on this Hanimex lens?

Your lens likely has a Canon FD mount. The reasons are as follows: It has a breech mount. Canon FL/FD lenses are among the most well-known breech-mount lenses. The location of the linkages matches ...
xiota's user avatar
  • 27k
6 votes

What is this mount with two buttons on side of Vivitar 75-205mm lens?

I believe this is an Olympus OM mount lens. The lens release button and aperture stop-down button opposing each other are a dead giveaway. Also, unless I'm mistaken, the engraved lettering in the ...
scottbb's user avatar
  • 32.9k
6 votes
Accepted

Does a camera have to have a contiguous housing?

You need to differentiate the camera, on where the sensor or film resides and the optical elements. This can be either lenses or mirrors. A mirror telescope is a good example of an open structure. ...
Rafael's user avatar
  • 25k
6 votes
Accepted

What's that little thing on a Nikon lens mount?

That is the EE servo coupling switch. This is only for use with older lenses (non-G AF lenses). Modern AF-S G lenses don't have an aperture control ring (it's completely controlled by the camera body)....
scottbb's user avatar
  • 32.9k
6 votes
Accepted

How do sensors "focus" on the bottom of the lens (flange distance)?

I am wondering how is it that the sensor "sees" the image when it's projected and focused on to it while it doesn't pick up a sharp image of a tiny object or my finger if I'll touch it (...
Kahovius's user avatar
  • 2,758
5 votes
Accepted

Is there a way to adjust the aperture of a Nikon lens without a camera or physical aperture ring?

Ultimately, we decided to use a Nikon BR-6 Auto Diaphragm Ring combined with a BR-2A Lens Reversing Ring, plus a Nikon AR-10 cable release for setting the aperture. This was the setup: A Nikon lens (...
Frank's user avatar
  • 91
5 votes

What adapter do I need to mount lenses for Chinon CM-5 on my Canon EOS 1100D?

The Chinon CM-5 uses a Pentax K mount and there are adapters available for about $15 to mount these lenses on your Canon 1100D. Mike Butkus Camera Manual Library Fotodiox Adapter
Mike Sowsun's user avatar
  • 12.3k
5 votes

How can I mount a non-AI lens on a Nikon F4?

I figured it out! Yes, the meter coupling tab is the tab on the ring on the camera that spins together with the aperture ring on the lens. In order to lift it, you first need to press inward the ...
Aram Hăvărneanu's user avatar
5 votes
Accepted

What is this breech mount with three flanges and a single linking pin?

It is likely a Canon FL mount. If you are looking for an adapter, it is compatible with the Canon FD mount using stop-down metering. See Evolution of the Canon FD Mount. If you'd like, you can ...
xiota's user avatar
  • 27k
5 votes

What lenses are compatible with older Canon EOS DSLR?

I own a Canon EOS 1100D camera that was released in 2011. What lenses are still compatible with this model? Canon EF lenses: All of them. Every single one made since 1987 when the EF mount was ...
Michael C's user avatar
  • 175k
5 votes
Accepted

What differentiates Canon EF(S), EF-M, and RF despite flange distance and pins?

They vary by designed sensor size, flange distance, and the number/arrangement of the pins. But what else differentiates them? EOS M cameras have sensors the same size as Canon's APS-C DSLR bodies ...
Michael C's user avatar
  • 175k
5 votes

Why has no phone manufacturer tried a lens turret system yet?

A few points why not: having such device involve sealing rotating part of phone which is not very easy and manufacturers try to minimize such details to make smooth rotation manufacturers need to add ...
Romeo Ninov's user avatar
  • 12.2k
4 votes
Accepted

Is it possible to control aperture when using a mount-adapter?

Is it possible to control aperture while using a mount-adapter and lens which does not have an aperture-ring? Yes, but if you're not using an adapter that does electronic communication between the ...
inkista's user avatar
  • 52.4k

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