Go Back   Rangefinderforum.com > Cameras / Gear / Photography > Sony Alpha / NEX Mirrorless > Sony NEX APS-C format

Sony NEX APS-C format For the many Sony fixed lens digital compact cameras

Thread Tools Search this Thread Display Modes

Medium Format Lenses/Sony NEX 6/7?
Old 01-02-2016   #1
Registered User
wjlapier's Avatar
wjlapier is offline
Join Date: Jan 2008
Posts: 1,687
Medium Format Lenses/Sony NEX 6/7?

Just curious how to think of what the effective focal length or angle of view would be for some medium format lenses I have. M645 Mamiya 55/2.8, 80/2.8 and 150/3.5. Using two adapters--Mamiya/Nikon and Nikon/Sony NEX. Either NEX 6 or 7.

  Reply With Quote

Old 01-02-2016   #2
Registered User
splitimageview is offline
Join Date: Jan 2014
Posts: 1,979
They will provide the same field of view as any lens with the same focal length, but with a larger (unutilized) image circle.

I.e., the 55mm will provide a field of view just like a 55mm from a 35mm camera will provide.
  Reply With Quote

Old 01-19-2016   #3
( IRL Richard Karash )
ColSebastianMoran's Avatar
ColSebastianMoran is offline
Join Date: Sep 2010
Posts: 2,339
Yup, your 80mm Mamiya lens will shoot like a 120mm on 35 or like a longer lens, maybe 200mm (I don't know the ratio) on your M645.
Col. Sebastian Moran, ret. (not really)

In Classifieds Now: Nothing.
Use this link to leave feedback for me.

Named "Best heavy-game shooter in the Eastern Empire." Clubs: Anglo-Indian, Tankerville, and Bagatelle Card Club.
Sony E/FE, Nikon dSLR, and iPhone digital. Misc film.
Birds, portraits, events, family. Mindfulness, reflection, creativity, and stance.
  Reply With Quote

Old 01-19-2016   #4
sevo is offline
Join Date: Oct 2008
Location: Frankfurt, Germany
Posts: 6,364
The focal length stays exactly the same as written on the lens. It does not change by changing the image format. So that 55 would be a 55, and so on - on APS-C, it has the same angle of view as a 85mm on FF (or a 150mm on 6x4.5cm)...

If you own small format lenses of identical focal length, speed and generic type, you might not want to bother. The small format lenses will usually be just as good, but much less heavy. Medium and large format lenses usually have quite similar lp/mm and contrast specs as any equally professional small format film era lens - the benefit is in the extra coverage giving higher contrast and resolution over the total larger image. Which you don't make any use of if you already crop the centre 24x36mm (or, worse, APS-C) in-camera.

That said, it is perfectly valid to use medium format lenses wherever you have no small format equivalent of them. I sometimes use a Mamiya to Nex adapter for the Mamiya macro, shift and soft lenses - but after I got the A7, I quit doing that on the Nex, the area loss is a bit too big there, and haze issues (due to the vastly excessive image circle) were frequently occurring especially in macro.
  Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -8. The time now is 17:00.

vBulletin skin developed by: eXtremepixels
Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.

All content on this site is Copyright Protected and owned by its respective owner. You may link to content on this site but you may not reproduce any of it in whole or part without written consent from its owner.