Search found 673 matches

by ChrisLilley
Wed May 12, 2010 7:44 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Transitions
Replies: 10
Views: 3165

So the idea in the first set is to have a more gradual transition between sharp and oof areas, to integrate the background; and in the second series to have a more diffuse, oof background to isolate from the background?
by ChrisLilley
Wed May 12, 2010 7:40 am
Forum: Equipment Discussions
Topic: StackShot Report
Replies: 58
Views: 77251

I would be interested in usage reports too. I mailed them to confirm compatibility with European voltage/frequency (yes) and shipping (50 bucks) but there are still some questions in my mind regarding stability of an arca-style clamp added to their top plate, and the accuracy and precision of the 10...
by ChrisLilley
Wed May 12, 2010 7:36 am
Forum: Equipment Discussions
Topic: RMS to M42 adapters
Replies: 3
Views: 1890

Thanks for the heads-up. I ordered one of their cone-type adapters to try out.
by ChrisLilley
Wed May 12, 2010 6:58 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Raynox 250 or extension tubes
Replies: 10
Views: 3538

Re: Raynox 250 or extension tubes

Hi, was wanting to know what would be the best set up to get closer again Raynox 250 or extension tubes, thanx for any help on this. :) The answer depends to some extent on what lens you want to use it with. Lenses that use internal focus or close range correction tend not to do well with extension...
by ChrisLilley
Wed May 12, 2010 6:52 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Raynox 250 or extension tubes
Replies: 10
Views: 3538

The Raynox 250 is a fairly good quality +8 diopter close-up lens. Its a 3 elements in 2 groups achromat, and is multicoated. However, the diameter is not that large and the adaptor to mount onto the filter threads is plasticy. (Is it ok to post links to other fora? I maintain a list of close-up lens...
by ChrisLilley
Wed May 12, 2010 4:04 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: wasp eye at 10X
Replies: 5
Views: 3010

Re: wasp eye at 10X

- Longitudinal CA is very high :shock: - Zerene Pmax did an admirable job, not only giving a near artifact free image but also removing efectively almost all longitudinal CA :D Longitudinal/axial CA is indeed very high and the secondary spectrum is the classic magenta in front / emerald green behin...
by ChrisLilley
Tue May 11, 2010 7:40 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Unknown make - 35mm macro bellows lens
Replies: 9
Views: 5714

Well surely as its marked 'Macro lens' then surely it is a dedicated macro lens, not an enlarging lens, and designed to be used the conventional way? Yes, but likely for use at lower magnifications than 1:1. Nikon are quite precise ('Micro' lenses go up to but not beyond 1:1, 'macro' lenses go beyo...
by ChrisLilley
Tue May 11, 2010 2:44 am
Forum: Equipment Discussions
Topic: Geranium robertianum. JML 21/3.5 "test"
Replies: 14
Views: 4366

By the way, how does this lens mount? Is it RMS?

Edit: never mind, found the JML mounting thread
by ChrisLilley
Tue May 11, 2010 2:40 am
Forum: Equipment Discussions
Topic: Good 5x lenses
Replies: 11
Views: 4896

elf wrote:How about expanding this to cover .5X to 20X and put it in the FAQ?
That would certainly have helped me and will doubtless help others.
by ChrisLilley
Mon May 10, 2010 4:22 pm
Forum: Equipment Discussions
Topic: Good 5x lenses
Replies: 11
Views: 4896

Olympus 38 mm f/2.8 bellows macro is my personal favorite, see HERE . Paul, Rik; thanks for the pointer. I will look into it. Is the older, f/3.5 one any good? Reversed EL Nikkor 50 mm f/2.8 also works well, though not up to the OM. Avoid the 50 mm f/4. I have been collecting data on the optimal ma...
by ChrisLilley
Mon May 10, 2010 3:05 pm
Forum: Equipment Discussions
Topic: Good 5x lenses
Replies: 11
Views: 4896

Good 5x lenses

As a side comment in another discussion , I saw: The thing is, as has been discussed before, at 5X there are many good options for lenses, many of which are less cumbersome. A forum search on 5x gave no hits, though; perhaps the search term is too short, or something. I'm interested in the 3x to 5x ...
by ChrisLilley
Mon May 10, 2010 2:49 pm
Forum: Equipment Discussions
Topic: Infinity objective
Replies: 29
Views: 27760

I had guessed at an achromatic doublet, since a singlet would surely give significant aberrations. Given the relatively recent date, a moulded aspheric is of course a possibility.

(Thanks for the welcome!)
by ChrisLilley
Mon May 10, 2010 1:46 pm
Forum: Equipment Discussions
Topic: Infinity objective
Replies: 29
Views: 27760

Re: Tube lens

Hi, I found this diagram of a zeiss tube lens, it may be as simple as it seems? http://fermionlattice.wdfiles.com/local--files/zeiss-microscopes/zeisstubelens Joaquim If it is that simple, would an achromatic +5 diopter close up lens (+5D = 200mm) also function as a tube lens? (Hi. First post. Have...