Search found 267 matches

by dickb
Mon Jan 25, 2021 5:10 pm
Forum: Equipment Discussions
Topic: Advices for enlarger lens
Replies: 17
Views: 239

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: 333

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: 333

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: 917

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: 9
Views: 2739

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: 9
Views: 2739

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: 5032

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: 5445

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: 5032

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: 1867

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...
by dickb
Mon Sep 28, 2020 3:53 am
Forum: Equipment Discussions
Topic: Horizontal Column Tripod
Replies: 6
Views: 1867

Re: Horizontal Column Tripod

I would only add the Edelkrone tilt head is really useful for macros. Great for height adjustments from 0 to about 5 inches https://www.bhphotovideo.com/c/product/1325934-REG/edelkrone_80236_flextilt_head2.html Since you screw this under your camera it won't give you a height adjustment of 0 inches...
by dickb
Tue Sep 15, 2020 3:08 pm
Forum: Equipment Discussions
Topic: Horizontal Column Tripod
Replies: 6
Views: 1867

Re: Horizontal Column Tripod

Every tripod design is a compromise, there is no single best option. Almost all tripods can be used for macrophotography, some designs are better suited for certain types of macrophotography. The design of having a centre column that can be used horizontally can be useful, but perhaps less so than t...
by dickb
Tue Sep 08, 2020 11:33 am
Forum: Equipment Discussions
Topic: Question
Replies: 14
Views: 2310

Re: Question

My reverse ring is so tin. Double male screws almost complete in the female counterparts. The idea of a taylormade ring is a good idea. Thank you. A thin combination is preferable most of the time, but it may not make a big impact on image quality. Getting a cheap and simple ring setup to test your...
by dickb
Fri Sep 04, 2020 2:54 pm
Forum: Equipment Discussions
Topic: Question
Replies: 14
Views: 2310

Re: Question

Step down rings? I would guess you need a male / male connecting ring and step up rings if you want to connect the filter threads. Using many such rings will increase the distance between the front lenses, which is less than ideal in most cases, so you may want to use as few rings as possible. When ...
by dickb
Fri Sep 04, 2020 1:16 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Would you recommend a tripod or monopod for macro in the field?
Replies: 23
Views: 6159

Re: Would you recommend a tripod or monopod for macro in the field?

One other possible solution is using a tripod with the camera mounted underneath it. Either by reversing the centre column or as I do by flipping the legs. This method has pros and cons, as any solution will have. Cons are the annoyance of the tripod legs interfering with manipulating the camera and...