Search found 47 matches

by _sem_
Thu Sep 29, 2016 5:06 am
Forum: Equipment Discussions
Topic: Venus Optics/Laowa: Very long distance 2x lens coming
Replies: 5
Views: 2600

I'd love to see a cutaway showing what's inside, it looks very ungainly and I imagine holding the thing steady could prove problematic. However, it's nice to see more dedicated gear come along, even if most don't know what it's for. I think it is probably a close relative of the Koheisha bug's eye ...
by _sem_
Fri Feb 20, 2015 3:54 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Macro wide-angle macro Rig
Replies: 14
Views: 5090

I can't find a current Canon lens between 20 and 35mm which focuses close :cry: - ?? There's a Tokina 35mm which goes to 1:1 but it's for APS only, so not wide. There's a table somewhere that lists max magnifications with their two extension tubes. Mind these will be at very short working distances...
by _sem_
Fri Feb 20, 2015 3:14 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Macro wide-angle macro Rig
Replies: 14
Views: 5090

Re: Hi

Hi, i tried some wide angel macro photography too. I used my 18-55 mm for that together with some extension tubes and +10 lens. But it works not that good. At 18 mm i have to get to close to the object. With 35 mm it works ok but the wide-angel effect istn that much better than with my tamron 90mm ...
by _sem_
Mon Jan 19, 2015 5:36 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Macro wide-angle macro Rig
Replies: 14
Views: 5090

Re: Macro wide-angle macro Rig

The easiest way is to use one of the compact cameras that have a "1cm" macro mode with sufficient magnification. Another relatively simple way is to use a wideangle lens on a very short extension tube, for instance I've got the Nikkor AI-s 20/3.5 on the old 5.5mm K1 ring. http://www.dpreview.com/for...
by _sem_
Mon Jul 29, 2013 4:23 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: 10.3x close up photography sharpest when set at f/8~f/11
Replies: 6
Views: 2254

If you think about the field of view the lens is designed for, you're only using tiny part of it (angle) in a macro application, eg when reversed at 5:1. Also the angle of incidence of the rays from the image and object, are way off what it was designed for. EG, if you use a 24mm reversed, it's foc...
by _sem_
Fri May 10, 2013 7:09 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Imitating an MP-E using a reversed zoom
Replies: 30
Views: 17367

BR recommended two old Nikkor 35-70 lenses for reversed macro use http://www.naturfotograf.com/lens_zoom_02.html#MF35-70f3.3 I believe the extension due to the butchered zoom helps improve quality in such applications because the sensor comes closer to the min. focus distance position (the lens shou...
by _sem_
Mon May 06, 2013 7:11 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Shooting with a reversed 18-55 mm Canon kit lens
Replies: 18
Views: 23755

Interesting thread :) I once played with a Nikon kit zoom 18-55, and also with the 18-200VR :lol: Qualitywise, the results were best at the wide end (max magnification). Magnification can be increased by inserting an additional extension tube. Moreover, this also seems to improve quality relatively ...
by _sem_
Fri Apr 26, 2013 8:02 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: HD pictures & video with Samsung Galaxy S2 on a microsco
Replies: 8
Views: 2631

I recall some folks were shooting bloodcells with smartphones even without a microscope. They were using ca 1mm ball lenses just in front of the lens. Images surely not as good :wink:
by _sem_
Thu Feb 14, 2013 6:20 am
Forum: Equipment Discussions
Topic: Alternative to Canon MP-E 65mm
Replies: 26
Views: 7898

Nikkor AI-s 20/3.5

The old Nikkor AI-s 20/3.5 is reputed to be good for supermacro when reversed. The relatively short FL means that one gets decent magnifications with a relatively short extension, say a set of extension tubes; and it makes a bit more impression of depth in a single shot due to low relative backgroun...
by _sem_
Sat Sep 29, 2012 3:23 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: lens resolution reversed
Replies: 10
Views: 3144

Re: lens resolution reversed

So, the best lenses to reverse are the ones that would have given excellent center resolution (forget the corners!), when focused close. Short macro lenses should qualify here. Regarding non-macro lenses, I gather a close-up diopter lens may be an alternative to the mentioned extension, so that the...
by _sem_
Sat Jun 16, 2012 2:27 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Request for comments on dpreview.com table
Replies: 28
Views: 6583

That sounds similar to comparisons that I've made also. One of those is HERE , in a thread that's probably worth re-reading because it's relevant to the current question. Well it was similar, but one'd have to be more persistent in achieving a similar frame (add an extension tube with the DSLR to g...
by _sem_
Fri Jun 15, 2012 3:56 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Request for comments on dpreview.com table
Replies: 28
Views: 6583

I used to believe a P&S could not compete with a DSLR for macro. Then I started to notice impressive macro work of some P&S users, and the short exposures used there compared to mine with the D90+Tamron60. Plus the odd perspectives. Then one guy on one forum made a fairly apples-to-apples comparison...
by _sem_
Fri Jun 15, 2012 7:48 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Request for comments on dpreview.com table
Replies: 28
Views: 6583

AFAIK there are also Kenko auto extension tubes for the Micro 4/3 system. They might work with the kit zoom for the start. The small sensors of compact cameras should be an advantage regarding handheld macro exclusively in ambient light (allowing shorter exposures than a comparable large-sensor setu...
by _sem_
Thu Jun 14, 2012 5:49 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: DOF of Micro 4/3 cameras and lenses
Replies: 10
Views: 8919

It is interesting how this topic keeps reappearing. Full-frame vs compacts, full-frame vs crop-frame DSLRs, mFT or Nikon1 vs DSLRs. The practical progress is that it used to be more difficult to compare different lens and sensors at once. With mFT, Nikon 1 or Pentax Q it is possible to compare to DS...
by _sem_
Wed May 09, 2012 3:01 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Disappointed in Kenko DG extension tubes for canon
Replies: 32
Views: 15504

If the inner metal tube screws into the metal mounts at either end,... You never lose hope do you? :wink: Whatever the inner tube is made of, it doesn't. It ends before the female mount side. No need to take it apart to see the 5mm gap on the longest tube. I think it is not plastic that flexes. The...