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Re: Curt Bentzin "Primarflex" Demontage, Wartung und Reparatur.
Rainer:Hallo Cabba,
ich habe dem Beitrag-Schreiber eine Mail geschickt. Vielleicht antwortet er ...
Vielen dank :)
Um mehr Informationen zu geben, mein erstes Vorhangrad ist genau so wie auf diesem Bild:
mazdaro:
Aber der Text fehlt, also weiß ich nicht, was das Problem ist. Ich glaube, ich habe den ersten Vorhang über den Punkt hinausgehen lassen, an dem er gehen soll. Meine erste Idee ist, die Feder zu überprüfen, wie in einer Barnack-Kamera. Aber vor weiterer Demontage würde ich gerne den Originaltext sehen.
Re: Curt Bentzin "Primarflex" Demontage, Wartung und Reparatur.
Hallo cabba,
ich habe nachgelesen: es fehlt nichts. Mehr habe ich nicht geschrieben. Ist alles schon etwas länger her. Am wichtigsten ist die von mir angefertigte Skizze mit den Nockenstellungen. Die hat mir beim Zusammenbau mehr als einmal weitergeholfen, wenn alles verstellt war. Leider kann es bei dieser Kamera sehr leicht dazu kommen: rien ne va plus.
Gruß Roland
PS: Vielleicht kannst Du die Schilderung Deines Problems mit Bildern bereichern. Ich kann mich nur noch daran erinnern, dass ich einen Vorhang manuell mit Hilfe eines Zahnstochers (Weiterdrehen des unteren großen Zahnrads) bis zum Einschnappen aufgezogen habe. Erst dann habe ich das zweite Zahnrad aufgesetzt.
Wenn es für Dich einfacher ist, können wir uns auch auf Englisch unterhalten.
Re: Curt Bentzin "Primarflex" Demontage, Wartung und Reparatur.
Hallo Mazdaro,
If english is ok for you then I will have a much easier time writing my issue to you. Deutsch is my 4th language, I need the dictionary all the time and it's slow (and probably a lot was wrong, sorry!)
My original issue was that when the shutter release was pressed, the shutter mechanism did not wait for the mirror to raise. The mirror raised, but the shutter was already opened and closed before the mirror moved out of the way. From your pictures, I recognized that a spring and peg was snapped off. I found the offending pieces inside the camera, removed, and added a spring from inside a ball pen to do the job. The spring is in a different place than the original, otherwise I could not get it to move in the right direction where it needed to go.
In this next photo, I have marked the area in a circle. Also curiously, I think my new problem is in this area too.
The first curtain tension wheel, also in the circled area, seems to have traveled too far counterclockwise. I think I did this when I was just putting some oil in the axles. It was late at night, and without thinking I released the shutter and wound the shutter with the shutter speed selector partially unscrewed.
At the present, I cannot change the shutter speed. I can't release the shutter, and I can't wind the shutter either. If I look at the curtains inside the camera, what seems to be there is the first shutter curtain, but it has gone too far up in the camera.
If I try to move the 1st curtain tension wheel, the curtain makes a ripping sound (not good!). If I use a toothpick, like you said, to tension the 2nd curtain, I can tension it and also release it and the mirror. I don't know where it is tensioning, since the whole time the 1st curtain is blocking the film gate. I am completely stumped. The camera was working after the spring repair, but now something is wrong with either the timing mechanism, the shutter tensioning, or both. It was a very stupid mistake to use the camera without the shutter speed selector partially unscrewed, I know.
If you have any idea what to do next, I am very open to suggestions. My thought is that the 1st curtain has traveled too far, maybe it is partially unseated in the bottom of the camera? Since the spring is there, it should pull the 1st curtain to the bottom past the film gate if I disengage the timing gear. But it does not move in any direction. So I don't know.
Re: Curt Bentzin "Primarflex" Demontage, Wartung und Reparatur.
Hi,
Don't worry, it's almost impossible to maintain the adjustment, when you remove the speed knob. This camera is rather tricky.
If the release button doesn't work, you have to moove the levers bottom left. On your picture it is the small disc with a cam next to No. 2 on the dial. Take off the dial, shift the long lever to the left and turn the small disc clockwise...
This is the post war modell with the long latch. Please look for a marking line on the gears. On one of my pictures you can see such a line within an orange circle. If there is no line (scratch) it's more difficult to adjust the gears.
Re: Curt Bentzin "Primarflex" Demontage, Wartung und Reparatur.
mazdaro:If the release button doesn't work, you have to moove the levers bottom left. On your picture it is the small disc with a cam next to No. 2 on the dial. Take off the dial, shift the long lever to the left and turn the small disc clockwise...
Ah, I meant that I can press the button, it releases the counter and film advance like it should, but it doesn't release the actual shutter curtain.
Even if I remove these two gears completely, the shutter curtain still does not go. I think either the curtain is physically stuck at the top, or the spring does not pull it from the bottom. If I gently touch the curtain, it feels like it is not pulled very tight like I would expect. I would probably have to record a video to show what I mean. Is there something else holding the first curtain from moving?
mazdaro:This is the post war modell with the long latch. Please look for a marking line on the gears. On one of my pictures you can see such a line within an orange circle. If there is no line (scratch) it's more difficult to adjust the gears.
I see the picture that you are talking about, I have many scratches. I will have to figure out which is the correct one, if I can get the curtain to release first.
Re: Curt Bentzin "Primarflex" Demontage, Wartung und Reparatur.
That's strange. Of course, the spring in the small cylinder might be broken, but it's unlikely. Is the mirror in reflecting position? Normally, it should come down, when the shutter curtains move upwards.
Re: Curt Bentzin "Primarflex" Demontage, Wartung und Reparatur.
I can bring the mirror down with the manual mirror lowering knob, and it goes up when I use the shutter release button. So I think it's in the up position naturally at this moment (shutter released position). I'm also thinking that the curtain tension spring might be broken, or at least unseated. I am not very keen to disassemble the camera totally to see the spring, if it is not the last option. Or is it easy to see the spring?
Other option could be, that the 1st curtain edge has gone over the 2nd curtain and gotten stuck in the top of the camera. I am not sure if it is possible with this camera, I have not seen the curtain mechanism with my own eyes.
Re: Curt Bentzin "Primarflex" Demontage, Wartung und Reparatur.
I just lost for the 3rd time on eBay. My last camera should be a slim Ilford Advocate. I hate black box cameras.
Yes, there is a mirror lowering knob, but the mirror should go down automatically, when the shutter is wound up. As far as I remember, the mirror is connected to the lever - I doubt the proper function of it's spring - that (normally) stops the medium-sized gear connected to the gear of curtain 1. Of course, after releasing the shutter the mirror is lifted up in a vertical position. So you can remove the rear panel in order to touch the curtain from both sides. Try to move the curtain downwards...
Re: Curt Bentzin "Primarflex" Demontage, Wartung und Reparatur.
No, it's not easy to see the spring. I tried to see it, but I had no chance to open the thin cylinder, without doing damage.
After removing the rear panel and the mounting for the film spools you might see, whether "the 1st curtain edge has gone over the 2nd curtain" or not. I don't think that such a catching is possible.
Anmelden
This camera is rather tricky.
camera should be a slim Ilford Advocate. I hate black box cameras.