Not Your Everyday Banana

by Bart Arondson

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13

Many confused answers here... Eruditass got it right, it's all about the viewfinder. Actually it's mostly the "ground" glass, which is not a ground glass anymore: it's a microstructured glass, optimized for light transmission with slow lenses, not for ease of manual focusing. Something a bit like a Fresnel lens. The eyesight, has nothing to do with this ...


8

Olympus made the VF-1 optical viewfinder to match its 17mm lens when it released the EP-1. Apart from that, I believe all other accessory viewfinders are actually made for the rangefinder market, and are all designed to match particular focal lengths on 35mm film; you'll have to adjust for the crop factors of EVIL cameras (2.0 for ยต4/3, 1.5 for the newer ...


8

Two things contribute to this phenomenon: The light collected by split image focusing screens are edge rays collected on the outer areas of the front element of the lens. With lenses that have smaller maximum apertures the focusing screen is trying to find light from an area wider than the front element of the lens. In most situations focusing and metering ...


4

"95% accurate" - there isn't such an optical viewfinder. IOW there isn't an optical viewfinder which will give you guaranteed the final result with at least 95% accuracy. Most probably you mean 95% coverage - this means that you see through your viewfinder only 95% from your photo area. So, it is nothing related to the bokeh. Speaking simply, as we all ...


3

I have a similar problem with my astrophotography setup in that sometimes it's difficult to see where I have my piggyback camera pointed in the sky. In stargazing circles, there are "unity" finders which are basically a piece of glass on which a dot is projected, allowing the user to orient the view at the sky with no magnification. These are called reflex ...


2

It's to do with the focussing screen, however I don't profess to completely understand all of the effects you mentioned. The focussing screen in modern DSLRs is made of laser etched glass in order to facilitate manual focussing and transmit as much light as possible for slow lenses. With old fashioned ground glass screens, the micro-structure of the glass ...


2

Aside from the Leica Ms, there is one very notable MILC with an optical viewfinder, which is the Fuji X-Pro 1. Its fixed-lens little brothers, the X100 and X100S also sport the same "hybrid" viewfinder which can be switched between an OVF with LCD overlay and an EVF and APS-C sensors. And unlike the X-Pro 1 have leaf shutters that are much quieter and can ...


1

The question would be why is it taking a long time when using the optical viewfinder. Different metering is used for optical (using the metering sensor) since the mirror is down vs direct measurement using the CMOS sensor when the mirror is up (LiveView). Something may be wrong with your metering sensor. First I'd check to make sure your metering settings ...


1

I notice two different possible things as I look in mine. The first is a reflection off the focusing LCD (normally a focusing screen, but in the 5Dm3 and 1Dx, they put in an actual see through LCD so that you can change the viewfinder image. The image on this looks like an inversion of what I normally see through the viewfinder. This can also be ...


1

I have the 550D (T2i) which is close to the 500D in many ways. I do not find it credible that the viewfinder could substantially alter the depth of field unless somehow it is managing to refocus the out-of-focus areas and I doubt it's capable of that. As a check, I took a look at items in my office through an f/2.8 17-55 mm lens and was readily able to ...


1

Today's viewfinders are designed to have better light transmission at the expense of diffusion. This is because autofocus cameras use a semi-transparent main reflex mirror so part of the light passes through the mirror and to a secondary mirror that is reflected down to the AF sensors at the bottom of the camera. In addition, many cheaper cameras use a ...


1

The mirror box assembly and necessary registration distance for an optical TTL viewfinder makes it nearly impossible to be compact. You'll have to live with pancakes (Pentax makes a great trio: DA40, DA21, and DA70) If you can live with a non TTL optical viewfinder, there are rangefinders. I hear some EVFs are actually pretty good, even in low light. ...


1

There actually still are a few viewfinder cameras with exchangeable lenses. The Leica M9 seems nice.



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