Showing posts with label meyer optics. Show all posts
Showing posts with label meyer optics. Show all posts

Tuesday, 25 June 2013

Exa 500

This is my fourth Ihagee camera and my third Exa.  The original Exa was a cut-down low-cost version of the Exakta and then the Exa line developed in its own right.

Exa 500 - front view

The Exa 500 is the end of the line for Exa cameras  and was developed after Ihagee was subsumed into VEB Pentacon, the state camera manufacturer.  The lineage from the Exakta is apparent in the shape.  This camera still has the rhomboidal shape introduced with the original 127 format Exakta in 1933.  It also still has the shutter release on the left, although the film advance is now on the right.  Another change is the fixed pentaprism viewfinder, so I cannot use the delightful waist level finder with this camera.

The immediate predecessor of this camera was the Exa II.  The body of the Exa IIa and this Exa 500 are identical although there are some internal differences.

Exa 500 - top view showing rhomboidal shape
The Exa 500 has a vertical cloth focal plane shutter which travels from bottom to top.  This shutter provides speeds from 1/2 to 1/500 seconds plus B.  This means it is twice as fast as the Exa II.  There are two flash settings: 1/60 for electronic flash and 1/15 for flash bulbs. This camera follows the Exa standard and flash synch is achieved by aligning a dot on the speed dial with either a zigzag icon or a bulb icon.  On the front of the body is a single PC connector.

This camera also has a shutter lock beside the viewfinder - cover the red dot to shoot, uncover to store the camera.  The only other real change between the Exa II and the Exa 500 is that the Exa 500 has an instant return mirror so the viewfinder does not go blank when you fire a shot.

Like other Exakta/Exa cameras, the film take-up spool is removable and can be replaced with an empty film cassette.  Doing this obviates the need to rewind the film but it does cost you one frame of film.  There is no internal knife to cut the film like the Exaktas have so this must be done after opening the back.  The only real advantage of this is the possibility of developing half a roll of film but I cannot imaging that many people have ever bothered.

The film advance is on the right as is normal in non-Ihagee cameras.  It has quite a short stroke of just over 90 degrees (compared to the Exakta Varex II where the advance travels about 300 degrees).

The back of these cameras come away from the camera body in one piece with the base.  This is supposed to make it easier to load film but I find this method harder.
Exa 500 - inside and the separated back  and take-up spool

Exa cameras were supplied with a variety of lenses depending on how much the customer wanted to pay.  This camera has a Meyer-Optik Domiplan. This is a triplet design so not as good as the Tessar option, but the Domiplan performs well enough when stopped down.  The lens is a semi-automatic lens - the diaphragm closes when the shutter release is pressed but stays open for composition and focussing.

The Domiplan achieves this automation by a hinged lug that protrudes over the shutter release - the photographer presses this lug which in turn presses the shutter release.

This mechanism in the Domiplan lens has a weak link that is prone to seizing but this particular lens performs OK.  My other Domiplan lens needed the mechanism cleaning with naphtha before it would work satisfactorily.

This camera would also work with my Exa fit Carl Zeiss Jena Tessar (we need to specify Carl Zeiss Jena in contradiction to Carl Zeiss Opton, the new (at the time) Carl Zeiss operation in West Germany.  East German Carl Zeiss Jena lenses are generally better than Carl Zeiss Opton lenses).

In use, this camera is much as you would expect.  The shutter speed selector is rather loose and I was not sure I was actually selecting any speed, but I tried exposures at various shutter speeds and they have all come out well exposed so the shutter speed selector must be doing its job.

There is a red flag in the viewfinder to tell you that you need to advance the film before taking the next shot.  In previous Exa cameras this was not necessary as the mirror would only return to the viewing position when you had wound on.  In this model, the mirror is an instant return mirror and it would seem that the makers thought users might get confused with such sophistication, hence the red flag.

The camera is light-proof (not a given with old cameras) and the shutter is moving smoothly.

Here are some sample photographs from my test film:








Friday, 12 April 2013

Praktica TL3

Praktica TL3, front view

lens: Meyer-Optik Görlitz Domiplan
focal length:  50 mm
apertures:  f2.8 to f22
focus range: 0.75m to infinity
lens fitting: 42 mm thread
shutter: metal vertical focal plane
speeds: to 1/1000
flash: bulb or electronic
film size: 35 mm

This is a standard looking camera from between 1984 and 1986.  It is a fairly heavy (very heavy by modern standards) and large enough to hold in two hands.  The ergonomics - the layout of the controls - is, again, normal for the time.  It is my second Praktica, the other being an MTL5B.

This camera takes 42mm thread lenses (also known as Pentax thread) which means that lenses are readily available.  It is specifically designed to work with automatic lenses (those with a pin to stop down the lens) - when the shutter is fired, a cam presses the pin and closes the aperture.  This is not essential, though, and the camera works fine with fully manual lenses.  I have shot half my test film with my Soviet Helios-44 lens from my Zenit E.  So long as you remember to manually stop the lens down for both metering and picture taking there is no problem.

This is a fully mechanical camera and no battery is required for its operation.  It does, however, use a battery for the metering system.  This should be a mercury battery giving 1.3 volts but these are no longer available.  I am using an alkaline 1.5 volt alternative which 'should' cause the camera to underexpose but I have checked the results of the built-in meter with my Ikophot meter and they are in complete agreement.

This is an SLR camera and so both metering and focussing are conducted through the lens (known as TTL, for the uninitiated).  With an automatic lens fitted, metering is done by selecting either the shutter speed or aperture, holding down the metering lever beside the shutter release and the adjusting either the aperture or the shutter speed until the needle in the viewfinder is as close to the circle as possible (i.e. it is a match-needle meter).  With the supplied lens, this is within 1/2 stop of 'perfect', with the Helios-44 it is to the nearest whole stop.

The meter can be set to a range of film speeds from 12 ASA/12 DIN to 1600 ASA/33 DIN.  It is settable in 1 DIN stages which equates to 1/3 stop.

top and rear view
The shutter is a vertical metal focal plane shutter.  It has a good range of speeds - up to 1/1000 seconds which is plenty fast enough for my photography.  There are two flash synchronisation speeds: 1/30 for bulbs and a separate position on the speed selector dial for electronic flash, which the manual says is 'about 1/125.  Both bulbs and electronic flash can synchronise at slower speeds.

Electronic flash can synchronise at 1/125 seconds (quite a high sync speed for the time) because this camera has a vertical shutter with three metal blades.  In the manual, Praktica tout this as a modern invention but Zeiss Ikon used a vertical metal shutter in the Contax I in 1932

The shutter release is not my favourite part of this camera.  It is placed on the front of the camera rather than on the top plate which I always find awkward.  Secondly, the shutter release has to be pressed flush with the housing.  This might be just my camera but a little less travel would be good.

The film winder is a lever which travels through 180 degrees but the first 20 or so degrees do nothing.

On top of the prism is an accessory shoe which has 'hot' contacts for a flash gun.  This is the only way of connecting a flash gun as there is no PC connector.  The only other control on the top plate is the film rewind crank.  As was normal for the time, this is an annoyingly small folding crank.  In the early 1960s several manufacturers introduced a large rewind crank on the base plate and it is a pity this did not become the standard.

Pressing the shutter release, you experience a significant resistance and then there is a loud and tactile 'clunk'.  I had thought my Zenit E had a heavy action but this is much worse.  I am hoping that most of this is the mirror slapping up and not the shutter.

The supplied lens is a Meyer Optik Domiplan f2.8 50mm lens.  This is a triplet lens and a cheap option.  I have yet to see the results of this lens but I have a 50mm Domiplan on my Exa IIa and that lens is fine.  Available apertures are from f2.8 to f22 in 1/2 stop clicks.

Focussing is from 0.75m to infinity and the focussing scale is in feet as well as metres.  The action is fairly stiff and changing the focus from near to far will result in the lens unscrewing rather than focussing.  Hopefully, this is lack of use and will sort itself out with use rather than being down to physical damage.

30 April 2013:

I now have the results of my test film.  It is not good.  There is a large light leak from the hinge end of the back.   I have just removed the remains of the foam light seal and replaced it with a new piece of foam.  Two frames out of the thirty six on the roll came out with no light damage.  So, light damage apart, I am quite impressed - the Domiplan lens works fine even though it is only a triplet

Lincoln Cornhill


Waterside North, Lincoln
Triton Road, Lincoln