what is the smallest mechanical SLR that you know of?

trendland

Member
Joined
Mar 16, 2012
Messages
3,398
Format
Medium Format
 
OP
OP

68degrees

Member
Joined
Dec 25, 2012
Messages
135
Location
Florida
Format
Multi Format
I guess I was wondering if there were any really small 35mm slrs. Like the size of the Olympus XA. Also, I never understood why lenses have to be so big for SLRs? I mean look how small the lens is on an XA little rangefinder. an slr lens is huge and its the same film 35mm. Why is that?
 

KN4SMF

Member
Joined
Mar 7, 2019
Messages
334
Location
US
Format
Traditional
Because of the necessity of designing a lens where the back element clears the mirror for one thing. Also the amount of glass needed in designing lenses with wider maximum apertures.
 

Theo Sulphate

Member
Joined
Jul 3, 2014
Messages
6,489
Location
Gig Harbor
Format
Multi Format

On a rangefinder (XA, Leica, etc.), the distance between the lens nodal point and the film plane can be shorter than for an SLR because there's no mirror. Since the distance is shorter, the lens (diameter) can be smaller.

Someone more familiar with optics can probably explain this better and more accurately.
 

AgX

Member
Joined
Apr 5, 2007
Messages
29,973
Location
Germany
Format
Multi Format
The OP has ... said nothing about % of viewfinder representation.


Well, you did:
Let's re-ask the question another way. What 35mm SLR is the smallest that gives a 100% viewfinder representation of the actual film area?

So, do not laugh about other fellows who get confused by this thread...
 

Pentode

Member
Joined
Feb 14, 2017
Messages
957
Location
Brooklyn, NY
Format
Multi Format
Well, you did
Actually, I was the one who said the OP said nothing about the veiwfinder, not KN4SMF.
I was not laughing at any members here with any cruel intent and I apologize if anyone has been offended by my post.
 

Pentode

Member
Joined
Feb 14, 2017
Messages
957
Location
Brooklyn, NY
Format
Multi Format
Because of the necessity of designing a lens where the back element clears the mirror for one thing. Also the amount of glass needed in designing lenses with wider maximum apertures.
Exactly this. Automatic diaphragms also require the lens to be a bit larger. If large apertures and auto diaphragms are of little concern a Pentax SV and an Industar-50 together make a remarkably small package for a full-frame, 35mm SLR. The optics of the I-50 are only modest, the lens is slow (f/3.5) and the aperture is manual but that is one seriously tiny lens.
 
Cookies are required to use this site. You must accept them to continue using the site. Learn more…