Search found 272 matches

by dickb
Sat Feb 20, 2021 7:26 am
Forum: Equipment Discussions
Topic: A story ... and a question
Replies: 6
Views: 303

Re: A story ... and a question

JKT wrote:
Sat Feb 20, 2021 1:18 am
The fixed aperture is f/8. I wonder if that "(1:8)" refers to that or optimal magnification.
I have a couple of Schneider lenses with fixed apertures and those are marked in a similar way: Cinegon 1.4/8 (1:2.0) and Xenoplan 1.4/23 (1:4.0). The number in brackets is the fixed aperture.
by dickb
Sat Jan 30, 2021 7:19 am
Forum: Equipment Discussions
Topic: Leica mount adaptor to Canon EF
Replies: 8
Views: 697

Re: Leica mount adaptor to Canon EF

Please, let me understand better this. To have the tube lens focussed to infinity, is not enough just to set the lens itself focussed to infinity? I thought to fit an adaptor M42 to the camera then an step down M42 to m39x1 and finally the componon 5.6/100. Is it enough or is it better to fit also ...
by dickb
Fri Jan 29, 2021 8:21 am
Forum: Equipment Discussions
Topic: Leica mount adaptor to Canon EF
Replies: 8
Views: 697

Re: Leica mount adaptor to Canon EF

2. M42 Extension rings (I recommend buying 3 sets of 30/20/10/5 mm) I think I don't need them because I'll mount the 5.6/100 directely on the camera like rear lens and a componon-s 4/28 as front lens. The standard way of using a tube lens is to have it focussed to infinity. You can try to optimise ...
by dickb
Wed Jan 27, 2021 4:19 pm
Forum: Equipment Discussions
Topic: Advices for enlarger lens
Replies: 21
Views: 1588

Re: Advices for enlarger lens

You are correct. You need an adapter with two male filter threads in this setup somewhere. On ebay these are called coupling rings, or male / male rings. A quick search doesn't show any such a ring available in either 43mm or 60mm, so you would need an intermediate size, say 43-62 stepup, 62-62 cou...
by dickb
Wed Jan 27, 2021 8:17 am
Forum: Equipment Discussions
Topic: Advices for enlarger lens
Replies: 21
Views: 1588

Re: Advices for enlarger lens

Thank you very much Dickb but let me understand. If I mount a step up / down 60x0,75 directely on the extension tube the output will be female but also the filter thread mount of the Componon-s 4/28 is female (43x0,75). You are correct. You need an adapter with two male filter threads in this setup...
by dickb
Mon Jan 25, 2021 5:10 pm
Forum: Equipment Discussions
Topic: Advices for enlarger lens
Replies: 21
Views: 1588

Re: Advices for enlarger lens

Then, I already have the 60mm diameter extension tube, how can I know which is the thread pitch? The thread pitch on my 60mm diameter extension tube set for Canon EF mount is 0.75mm. There are step up /down rings for 60mm/0.75mm directly as well, I have a 60mm-62mm step up ring. The bayonet mounts ...
by dickb
Sat Jan 09, 2021 8:55 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sensor-Pan system
Replies: 6
Views: 875

Re: Sensor-Pan system

Thanks. An interesting approach. So the focus is done by varying the extension between lens and camera. Is telecentricity a limiting factor for lens choice here or are your subjects so flat that that doesn't become an issue?
by dickb
Sat Jan 09, 2021 6:20 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sensor-Pan system
Replies: 6
Views: 875

Re: Sensor-Pan system

Very interesting. Do you have a description of the Sensor Pan system you used for this? Some sort of automated XY system to move the camera through the large image circle of the lens, I presume? Do you connect the lens and camera with a bellows or another system that allows the necessary movement?
by dickb
Fri Dec 11, 2020 7:49 am
Forum: Equipment Discussions
Topic: 8000ED Scanner lens mounting idea
Replies: 7
Views: 1619

Re: 8000ED Scanner lens mounting idea

Can also design an adaptor that secures the lens via set screws, like these: https://rafcamera.com/catalogsearch/result/?q=scanner I had one designed but never got it made, as I swapped the lens for a Minolta 5400 one. Raf already makes one: https://rafcamera.com/adapter-d50-to-m42x1m It is not cle...
by dickb
Tue Nov 03, 2020 6:31 am
Forum: Equipment Discussions
Topic: Review of Mitakon Creator 85mm f/2.8 1-5X Mark II
Replies: 10
Views: 3456

Re: Review of Mitakon Creator 85mm f/2.8 1-5X Mark II

The redesign caused the nominal aperture to increase from f/2.8 to roughly f/4.8-f/5.6 I would suggest the aperture decreased or was reduced. The way I use the term aperture value in the review is in the sense of f/ratio. This is the aperture as expressed in several of the geometric optics formulas...
by dickb
Sun Nov 01, 2020 3:55 am
Forum: Equipment Discussions
Topic: Review of Mitakon Creator 85mm f/2.8 1-5X Mark II
Replies: 10
Views: 3456

Re: Review of Mitakon Creator 85mm f/2.8 1-5X Mark II

A very interesting article. In its summary you say: The redesign caused the nominal aperture to increase from f/2.8 to roughly f/4.8-f/5.6 I would suggest the aperture decreased or was reduced. You suggest as an alternative to this lens a combination of the Laowa 25mm and 100mm lenses. It would be i...
by dickb
Sat Oct 10, 2020 11:35 am
Forum: Equipment Discussions
Topic: Schneider locking screws
Replies: 29
Views: 5323

Re: Schneider locking screws

Just wondering, are these thumbscrews identical to the ones from the Xenoplan machine vision line of lenses? Anyone owning both types of lenses? I measure the Xenoplan ones to have a width of 2.4mm over the peaks of the screw thread and be 4mm in length, with the final mm close to the knurled head ...
by dickb
Wed Oct 07, 2020 8:29 am
Forum: Equipment Discussions
Topic: Micro-Symmar 3.5x
Replies: 32
Views: 5644

Re: Micro-Symmar 3.5x

Indeed it is a "Micro-Symmar", I believe Schneider's only lens with this designation. I have one on the way to me. We'll see how well it performs. Like Lou states, it's odd that SK chose to call it micro-symmar rather than mikro-symmar, which would be logical given their german spelling of makro-sy...
by dickb
Sun Oct 04, 2020 11:22 am
Forum: Equipment Discussions
Topic: Schneider locking screws
Replies: 29
Views: 5323

Re: Schneider locking screws

Just wondering, are these thumbscrews identical to the ones from the Xenoplan machine vision line of lenses? Anyone owning both types of lenses? I measure the Xenoplan ones to have a width of 2.4mm over the peaks of the screw thread and be 4mm in length, with the final mm close to the knurled head l...
by dickb
Mon Sep 28, 2020 11:15 am
Forum: Equipment Discussions
Topic: Horizontal Column Tripod
Replies: 6
Views: 1987

Re: Horizontal Column Tripod

Depends on how you measure it. I meant 5 inches from the top of the device. I use mine on a Regular tripod, on a table tripod and on a flat plate (don’t recall the name now). Especially great when lying on the ground and need a little more height Indeed, these are useful ways to deploy a tripod hea...