Search found 1311 matches

by enricosavazzi
Wed Apr 14, 2010 10:58 am
Forum: Equipment Discussions
Topic: Making a big telecentric lens (a though experiment)
Replies: 6
Views: 2901

Making a big telecentric lens (a though experiment)

We know that D, the usable diameter of the area of view of a telecentric lens, is D = dl - da where dl is the diameter of the front lens element and da is the diameter of the aperture, which is located at the rear of the lens and at a distance from the lens equal to its focal length (as discussed in...
by enricosavazzi
Sun Apr 04, 2010 1:46 pm
Forum: Equipment Discussions
Topic: Fibre optic goosenecks
Replies: 28
Views: 6148

I have the same problem with the Bogen flex arms I use - the spring is too springy ! The hydrostatic arms look great (an alternative would be Wimberley macro arms) but expensive. What I'm leaning towards is just a clamp on top of a small ballhead. I have one Manfrotto (Bogen is a rebranded Manfrott...
by enricosavazzi
Sat Apr 03, 2010 3:54 am
Forum: Equipment Discussions
Topic: Fibre optic goosenecks
Replies: 28
Views: 6148

My thinking leads me to a combined solution pumping the light in through a light pipe: LED plus flash. Not rocket science - I think Charlie made up something similar - or you can just visit Novoflex: http://www.novoflex.com/en/products/macro-accessories/cold-light-source/ It looks like a simple bea...
by enricosavazzi
Sat Apr 03, 2010 1:04 am
Forum: Equipment Discussions
Topic: Fibre optic goosenecks
Replies: 28
Views: 6148

I've been experimenting with different goosenecks salvaged from other sources in order to make them self supporting but haven't got a good solution yet. I remember from my days of using stiff gooseneck illuminators with stereomicroscopes in university labs that it was easy to place the ends of the ...
by enricosavazzi
Thu Apr 01, 2010 1:41 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Stopping down objectives – useful or not? (images added)
Replies: 28
Views: 18447

Re: Stopping down objectives – useful or not?

A couple of days ago I received a Nikon BD M Plan 10/0.25 (210/0) and just happened to mount it onto the same adjustable iris (shown in the image above). Since the rear element of this objective is much further in front of the iris than with the humble Zeiss I expected the iris to act more like a m...
by enricosavazzi
Mon Mar 29, 2010 2:51 pm
Forum: Equipment Discussions
Topic: Advice on objectives
Replies: 5
Views: 4925

Re: Advice on objectives

... These Are the ones he has for sale: 1    Luminar  16mm/2.5 Zeiss/Winkel 1   Luminar  25mm/3.5 C.Zeiss 2    Luminar  63mm/4.5 C.Zeiss     2  Summar  25mm/2.8  Leitz  1  Summar  42mm        Leitz  1   Summar   12cm/4.5   Leitz  M39 1  Photar     25mm/2.5   Leitz  2  SP-Reflex   1/3x  Basically, t...
by enricosavazzi
Sat Mar 27, 2010 12:17 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Getting less than 1:1 with an MPE-65
Replies: 6
Views: 3750

On a 1.6 crop camera the MPE-65 can be a bit of a problem for general bug shooting and as many people have commented they would happily swap it for a high quality lens with the range from around 0.3 :1 to 3:1 magnifcation rather like the old Minolta macro lens. The answer also needs to be failry ch...
by enricosavazzi
Fri Mar 26, 2010 8:07 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Getting less than 1:1 with an MPE-65
Replies: 6
Views: 3750

In theory it is possible. In practice, however, there is no real reason to adapt an MPE-65 for work at less than 1x when there are dozens of models of perfectly good macro lenses that already do this.
by enricosavazzi
Fri Mar 26, 2010 7:53 am
Forum: Equipment Discussions
Topic: Raynox CM-3500 with Fungus
Replies: 7
Views: 12863

Hello, lenses in the condition you illustrate are of course not acceptable, unless they have been clearly advertised as fungus-infested and sold at a substantial discount. The problem with eBay and similar purchases is that it may cost more to return the defective items than to buy new ones. Returni...
by enricosavazzi
Tue Mar 23, 2010 8:25 am
Forum: Equipment Discussions
Topic: Leitz/Leica/other microscope stand for photomacrography?
Replies: 11
Views: 13743

Update: Leica Galen III stand

As an update, I bought a Leica Galen III stand, despite the recommendation to the contrary by Choronzon (above). The reason that made me decide is that the fine focusing mechanism is of the infinite type with planetary gears, just like the Nikon and Olympus ones often discussed in this forum, with a...
by enricosavazzi
Tue Mar 16, 2010 9:08 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Nikon/Canon live view implemetation. Vibration, flash.
Replies: 30
Views: 21012

The old Nikon D70 (I think) has and alternate electronic shutter but only for high speed flash synch and it has no mirror lockup. It does, sort of, but not exactly - The D70 and D70s have a mechanical shutter with a rather slow fastest speed (1/125 s if I remember correctly). Shorter exposure times...
by enricosavazzi
Mon Mar 08, 2010 11:48 pm
Forum: Equipment Discussions
Topic: Leitz/Leica/other microscope stand for photomacrography?
Replies: 11
Views: 13743

I replaced my fine focus shaft and that was the only one that I could find. It is all made of metal, there should not be any future problem (I hope). To remove the fine focus shaft: 1. Remove both fine focus knobs by loosing the hex screw that keep them in place. 2. On the side that has the numeric...
by enricosavazzi
Mon Mar 08, 2010 1:41 pm
Forum: Equipment Discussions
Topic: Leitz/Leica/other microscope stand for photomacrography?
Replies: 11
Views: 13743

Enrico, I have no familiarity with the Leitz stands you are talking about. But have pretty significant experience with the Nikon Labophots ... If buying a used Labophot you need to be sure the fine focus works smoothly. There is a plastic pinion gear on the fine focus shaft that is prone to crackin...
by enricosavazzi
Thu Mar 04, 2010 2:17 am
Forum: Equipment Discussions
Topic: Leitz/Leica/other microscope stand for photomacrography?
Replies: 11
Views: 13743

Leitz/Leica/other microscope stand for photomacrography?

I am considering buying a second-hand microscope stand to modify for photomacrography (including stacking) above approximately 10x. I already have adequate stands for lower magnification, and most of the RMS photomacrographic lenses and microscope objectives for this use. I plan to put the microscop...
by enricosavazzi
Mon Mar 01, 2010 7:16 am
Forum: Equipment Discussions
Topic: Lens Resolution (was 'Nikon Multiphot brings $3,550')
Replies: 63
Views: 42692

Re: More reasonable alternative!

Hokan: Lumiinars with a blue dot marking on them were the last Luminar series to be sold. (Blue dot supposedly identified Luminars that had the latest "treated" optics. Flare, reflectiions, color, etc.) The geometry and glass were the same as earlier Luminars. I have a mixture of both haven't notic...