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peterqd
Joined: 28 Feb 2007
Posts: 8068
Location: near High Wycombe, UK
Expire: 2014-01-04
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 Posted: Sun Jan 31, 2016 5:14 pm Post subject: |
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peterqd wrote:
| Gerald wrote: |
| peterqd wrote: |
| I think you have the colours confused though - on your graph the exposure time is in red and the slit width is green. |
I don't know if I got it right. Do the colors I chose have a special meaning? Or do you think I've made a mistake? |
You've reversed the colours. On the graph the time segments are red and the slit width is green.
Now read your message carefully:
| Gerald wrote: |
| In a well adjusted shutter, the size of green segments, which give the exposure time, are constant, but the size of red segments, which give the width of the slit between curtains, increase continuously. |
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Gerald
Joined: 25 Mar 2014
Posts: 1196
Location: Brazil
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| Posted: Sun Jan 31, 2016 5:44 pm Post subject: |
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Gerald wrote:
You're correct. I really confused the colors in the text. 
Already corrected my post. Thank you, Peter!!!
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bratboy_y2k
Joined: 29 Apr 2011
Posts: 16
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| Posted: Mon Feb 01, 2016 3:04 am Post subject: |
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bratboy_y2k wrote:
So are people thinking this is possible? |
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visualopsins
Joined: 05 Mar 2009
Posts: 10362
Location: California
Expire: 2021-06-22
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| Posted: Mon Feb 01, 2016 3:22 am Post subject: |
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visualopsins wrote:
Yes. Now what? 
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Cameras: Sony A7Rii, Spotmatics II, F, and ESII, Nikon P4
M42 Asahi Optical Co., Lenses:
Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200
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Macro-Takumar 1:4/50
Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm
Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element),
Super-Multi-Coated Fisheye-TAKUMAR 1:4/17
Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500
Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100
Super-Multi-Coated Bellows-TAKUMAR 1:4/100
SMC TAKUMAR 1:1.4/50, 1:1.8/55
Other lenses:
Carl Zeiss Jena Flektogon 2.4/35
SMC PENTAX ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (51BB), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto
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bratboy_y2k
Joined: 29 Apr 2011
Posts: 16
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| Posted: Mon Feb 01, 2016 4:09 am Post subject: |
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bratboy_y2k wrote:
I'm guessing I need to pick a camera and then see if I can get info on the film advance to see if it can be modified. I have an F100 but I think if it all worked, marking the viewfinder would be a bit of an issue. |
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Gardener
Joined: 22 Sep 2013
Posts: 950
Location: USA
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| Posted: Mon Feb 01, 2016 7:54 am Post subject: |
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Gardener wrote:
| bratboy_y2k wrote: |
| I have an F100 |
Jeez, try it on N65 or something first. |
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bratboy_y2k
Joined: 29 Apr 2011
Posts: 16
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| Posted: Mon Feb 01, 2016 6:10 pm Post subject: |
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bratboy_y2k wrote:
Well if I can find out that the transport is in some way mechanical on the F100 I don't mind giving it a shot. If it's not it will be a total issue. |
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visualopsins
Joined: 05 Mar 2009
Posts: 10362
Location: California
Expire: 2021-06-22
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| Posted: Mon Feb 01, 2016 9:23 pm Post subject: |
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visualopsins wrote:
Via internet search there should be some mechanical drawings of shutter and film advance mechanisms, even, perhaps, some animations -- I have seen these in popular media such as in Nova tv broadcasts.
I.e., figure out how you'd modify the mechanical drawings -- the techniques for other cameras should be similar enough to make this a worthy exercise before breaking into any actual equipment...
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Cameras: Sony A7Rii, Spotmatics II, F, and ESII, Nikon P4
M42 Asahi Optical Co., Lenses:
Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200
Tele-Takumar 1:5.6/200, 1:6.3/300
Macro-Takumar 1:4/50
Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm
Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element),
Super-Multi-Coated Fisheye-TAKUMAR 1:4/17
Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500
Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100
Super-Multi-Coated Bellows-TAKUMAR 1:4/100
SMC TAKUMAR 1:1.4/50, 1:1.8/55
Other lenses:
Carl Zeiss Jena Flektogon 2.4/35
SMC PENTAX ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (51BB), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto
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Lloydy
Joined: 02 Sep 2009
Posts: 7768
Location: Ironbridge. UK.
Expire: 2022-01-01
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| Posted: Mon Feb 01, 2016 11:48 pm Post subject: |
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Lloydy wrote:
| Gerald wrote: |
In fact, the curtain speed doesn't need to be constant. A real curtain comes out of immobility and its speed increases continuously as it runs through the focal plane. For the exposure to be uniform, it is the necessary and sufficient that the graphs of distances traveled versus time for both curtains be parallel (a shift in time, or a delay) as shown below. In a well adjusted shutter, the size of red segments, which give the exposure time, is constant, but the size of green segments, which give the width of the slit between curtains, increases continuously.
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Yes, that makes sense.
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bratboy_y2k
Joined: 29 Apr 2011
Posts: 16
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| Posted: Tue Feb 02, 2016 3:57 am Post subject: |
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bratboy_y2k wrote:
I think I'll post in a Nikon forum to see if anybody has any has any transport system knowledge on the F100 as I have one here. I am concerned about marking the viewfinder if the rest works though. |
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