busmaster2 Loc: College Point NY

I'm currently using mostly A mount Sony cameras and was wondering what if any purpose the chipped adapters serve other than mark the pictures as "Minolta 50mm 1.7". In this case I'm using various screw mount lenses.

Meyer Orestegon 29mm 2.8

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RWR Loc: La Mesa, CA

Chipped adapters are for lenses with a CPU, so the camera can communicate with the lens.

busmaster2 Loc: College Point NY

So then it makes no difference when using an m42 to A mount. So again why would it be included?

RWR Loc: La Mesa, CA

Certainly no M42 lens ever had a CPU that I'm aware of. I cannot answer that one.

RWR Loc: La Mesa, CA

I did a little search, as expected found no Sony A to M42 adapters with a chip. What adapter do you have?

busmaster2 Loc: College Point NY

I have a few some of which have gold contacts and are sold as chipped. She. Used they write to the exif and state Minolta 50 1.8. So my question is aside from writing to the file which never changes what can it do for the pictures themselves?

RWR Loc: La Mesa, CA

Nothing. (Best I can do!)

blackest Loc: Ireland

it depends on the camera a chipped adapter on a canon lets the focus confirmation work the camera will beep when focus is achieved. It also states 50mm f1.4 in the exif. I don't know the Sony so I don't know if it does anything for those camera's

My m43 adapters are mechanical with no electronics and focus is by eye which isn't so bad since you can magnify a small area and see the focus at that point, not possible on all DSLR's

http://www.eadpt.com/eadpen.htm

"he M42-MAF electronic adapter, which has the electronic circuit inside, may simulates the data interface of the lens of the Minolta-AF format. Its electronic touch point connect to the same point on digital camera body.. When digital camera body power on, it reports the simulating data of the lens to the digital camera body. Thus, the digital camera body will treat the MF lens as the AF lens. Then the Focus Confirmation, as well as more important Anti-Shake ("SSS" in Sony/Alpha) functions can be started normally.
New firmware was updated for mutiple data adapter/chip (ver:B) .

l Preset Len's data (Only valid for Multiple Data Adapter/Chip)

1. Close Camera Body's Power, Mount the adapter and MF Len
2. Open Camera Body's Power You can preset Len's data Anytime By Press Lens-Release Button (for old version should be half-press shuttle button and release it within 10 seconds.), you can select to next sets Len's data. The default order is 50/1.1 ->85/1.4->135/2.8->200/3.5 .
3. If you want reset Len's data, Just Press Lens-Release Button at anytime, (for old version you should turn off Camera Body's Power, re-mounting adapter and repeat from step 2)
Tips: should set aperture to minimum value i.e. 1.1, then you can observed the aperture value changing when preset Len's data."


So it looks like the chipped adapter gives focus confirmation and shake reduction on the Sony camera's. On a Pentax the shake reduction requires a focal length to be selected to optimally compensate. How that works with the Sony I do not know. It looks like you can record aperture values too.

With Pentax bodies its possible to fool the system with some foil as it has a slightly recessed pin on the mount. by shorting this pin then the camera thinks a ka lens is present, there is a digital code from pins around the lens mount basically these are insulated or non insulated making a 0 or a 1 with a straight short they are all 1\s and that reads as an f1.4 lens. The shake reduction gives the focal length. So if you are in manual mode and set the dial for f4 and then manually adjust the lens to f4 then the exif information can be correct. It can be a pack of lies too. Without this the exif records f0 for the f-stop.

I imagine the sony bodies may fire off commands to the lens to focus out and focus in with you being the focus motor.