Sony Digital Camera Forums

Digital Photography Equipment => Lens Talk => Topic started by: Gordon McGeachie on October 15, 2017, 12:32:45 PM

Title: Metering with Samyang
Post by: Gordon McGeachie on October 15, 2017, 12:32:45 PM
I have been wondering for quite a while about how you meter when using a Samyang manual lens on a DSLR.

Can anyone help?
Title: Re: Metering with Samyang
Post by: AScot on October 15, 2017, 05:56:50 PM
Gordon, the camera does the metering, not the lens. You only have to do the focusing with a manual lens.

Or am I missing something in your question?
Title: Re: Metering with Samyang
Post by: Gordon McGeachie on October 17, 2017, 04:40:36 PM
Gordon, the camera does the metering, not the lens. You only have to do the focusing with a manual lens.

Or am I missing something in your question?

I think I may be confusing myself, will have to think again and come back.

after thinking a bit more.......

If there is no chip in the lens, how does the camera know what the aperture range is?

Can you use automatic modes, or do you have to use manual exposure?

If using manual mode on the A350/550/700 bodies which have no auto ISO in manual mode, how do you get correct exposure?

Do you have to preset the aperture on the lens, then set that aperture in manual exposure mode

Its may be really simple, but I cant get my head around it.........




Title: Re: Metering with Samyang
Post by: AScot on October 18, 2017, 01:04:26 AM
I was oversimplifying things by thinking of a non Sony/Minolta manual lens that was made to fit the A mount (or E mount). That's why I asked if I had missed something in your question.

If the lens you want to use is truly manual in every respect, does not have the 5 pins at the mount, but does fit the A or E mount (or with the use of an an adapter) then you are back to the days when cameras were all manual and had no meter. In those days, we had to use the Sunny sixteen rule or the Loony 11 rule. As you know in order to get the correct exposure you must balance three things, Shutter speed, Aperture and ISO. The focus is independent. Please google these two rules to find out how to use them, I simply do not have the time right now. Sorry Gordon. :| I will try and get back to you later.

Title: Re: Metering with Samyang
Post by: REX (aka TG) on October 18, 2017, 05:59:33 AM
Gordon, the camera does the metering, not the lens. You only have to do the focusing with a manual lens.

Or am I missing something in your question?

Ascot is right the metering will be done by camera. Even it is full manual you will get TTL metering (Tthrough The Lens)

The contacts give information to camera
-what lens you use focal length for AS/IBIS
-to control aperture from camera electronically

Title: Re: Metering with Samyang
Post by: Gordon McGeachie on October 18, 2017, 06:38:41 AM
thanks guys, I have an old Pentacon 50mm f1.8 with an adaptor, will have to get out and play sometime