dotmick
Joined: 04 Dec 2020
Posts: 1
Location: United Kingdom
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 Posted: Fri Dec 04, 2020 3:06 pm Post subject: Issues with Fujinon F1.4/12.5mm (Raspberry Pi Project) |
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dotmick wrote:
Hi there,
First of all, let me know if that's not the right section, I'll move the topic.
A few weeks ago I've started a small project to create my own camera/webcam using a Raspberry Pi Zero and their latest 12M camera sensor. Everything's working perfectly when using a lens like the ArduCam 2.8-12mm:
#1
#2
#3
#4
Not the best quality here, but it works (you can even see the details of my dirty window).
I have acquired a Fujinon f1.4 12.5mm CF12.5HA-1 on eBay (new condition) as I've read that it was a very good c-mount lens. But here's the results I am getting with it:
#5
I can't get it to work properly and I see artefacts as well. What do you think? Is it broken? :/
Thanks in advance! |
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alex ph
Joined: 16 Mar 2013
Posts: 1526
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| Posted: Tue Dec 08, 2020 10:05 pm Post subject: |
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alex ph wrote:
It seems like your new lens is too far from the focal plane, so that when you put it at infinity it only focuses at a distance of several millimeters. And it simply captures some dust on your sensor when you close the diaphragm to max.
What is the flange distance of your Raspberry camera? The Fujinon you took has a Back Focal Distance (In Air) of 16.07mm, following this data sheet. If your camera has a larger flange distance from mount to sensor, you should either try to put the new lens a bit deeper, if possible, or to change something in your camera construction, if it is even admitted by its construction. |
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visualopsins
Joined: 05 Mar 2009
Posts: 10189
Location: California
Expire: 2021-06-22
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| Posted: Wed Dec 09, 2020 1:06 am Post subject: |
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visualopsins wrote:
Welcome dotmick
Remove CS adapter from camera, lens,or both.
_________________
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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) |
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