Search found 673 matches

by ChrisLilley
Wed Jul 20, 2011 5:28 am
Forum: Equipment Discussions
Topic: APO RODAGON-D 75mm f4.5 2X opinions
Replies: 51
Views: 27186

Re: APO RODAGON-D 75mm f4.5 2X opinions

Is it? I understood the "D" to stand for "duplication" so that it is indeed originally designed as a projection lens. Duplication is taking, not projection. The 1:1 was designed for taking pictures of 35mm slides with 35mm film, creating movie prints from originals, etc. Thanks for the explanation,...
by ChrisLilley
Tue Jul 19, 2011 1:19 pm
Forum: Equipment Discussions
Topic: Macbeth Nano colorchecker
Replies: 5
Views: 1794

I'm puzzled why they have 30 patches instead of the 24 patches that the normal sized ones have.
by ChrisLilley
Tue Jul 19, 2011 10:49 am
Forum: Equipment Discussions
Topic: APO RODAGON-D 75mm f4.5 2X opinions
Replies: 51
Views: 27186

For the M=2 version, I've only owned 1 copy. I tried it both forward and reversed, and it was sharper and had flatter field at M=2 in forward orientation. However, as with the M=1 these may have variations since the sharpness of the M=2 (at M=2) was inferior to a good copy of the M=1 version (at M=...
by ChrisLilley
Tue Jul 19, 2011 10:46 am
Forum: Equipment Discussions
Topic: APO RODAGON-D 75mm f4.5 2X opinions
Replies: 51
Views: 27186

Re: APO RODAGON-D 75mm f4.5 2X opinions

I'm not so sure. The 75/4.5 M=2 is not an enlarging / projecting lens, but a taking lens. From that perspective it should be used forward for 2X, and reversed for 0.5X. My testing seemed to back this up, but I may have been subjected to an inferior copy. The lens is also fairly symmetric looking, s...
by ChrisLilley
Sun Jul 17, 2011 4:06 pm
Forum: Equipment Discussions
Topic: APO RODAGON-D 75mm f4.5 2X opinions
Replies: 51
Views: 27186

Re: APO RODAGON-D 75mm f4.5 2X opinions

rjlittlefield wrote: Except for the easy case of 1:1, I'm never sure what M:N means. Does 2:1 mean 2X or 0.5X?
2x.
by ChrisLilley
Sun Jul 17, 2011 10:24 am
Forum: Equipment Discussions
Topic: APO RODAGON-D 75mm f4.5 2X opinions
Replies: 51
Views: 27186

Re: APO RODAGON-D 75mm f4.5 2X opinions

Hello, I have just bought this lens and I intend to use it in the field and at home from 1X to 3X I have found little information about the lens so anything you can say would be apreciatted. The lens should be used reversed or normal position?, it is not an enlarger lens but a duplicating lens opti...
by ChrisLilley
Sat Jul 16, 2011 6:57 am
Forum: Equipment Discussions
Topic: Monitors for photography
Replies: 12
Views: 5789

Monitors for photography

Recently Craig said Regarding a monitor; buy the best you can possibly afford. High-end, big name monitors with a dead pixel can be purchased at significant savings. The dead pixel is virtually irrelevant. Apparently, my main monitor has a dead red pixel somewhere in the bottom right-hand corner. I ...
by ChrisLilley
Fri Jul 15, 2011 6:01 am
Forum: Equipment Discussions
Topic: Starting From Scratch With A New PC
Replies: 124
Views: 32040

If one were to avoid impulsively throwing in too many "extras" like blu-ray DVD burners, and if one were to (probably wisely) stick with a single video card instead of the dual-video-cards I splurged on, a maxed-out Intel i7-2600K-based, air-cooled tower as I described would run about $3000 or so. ...
by ChrisLilley
Wed Jul 13, 2011 4:03 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Myathropa florea
Replies: 11
Views: 1528

Superb, crystal clear images. Wonderful.
by ChrisLilley
Wed Jul 13, 2011 3:51 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: First attempts with a microscope objective
Replies: 46
Views: 8576

lauriek wrote: So for instance if the objective is designed for 160mm and you have 200mm of total extension then you'll be achieving 200/160x10 =12.5x
If the objective is marked 160 then it is designed for 150mm extension, so
200/150x10=13.3x
by ChrisLilley
Mon Jul 04, 2011 2:49 pm
Forum: General Discussion Forum and Community Announcements
Topic: New Hejnar 4.8" F67 clamp
Replies: 2
Views: 1197

New Hejnar 4.8" F67 clamp

This seems to be a recent addition and may be of interest to members here. Chris Hejnar now makes a 122mm (~ 4.8") arca-compatible clamp. It has three 3/8"-16 threaded holes on 35mm centres. It looks like a great clamp for attaching something long and heavy to a macro rig, such as a microscope focus...
by ChrisLilley
Sat Jul 02, 2011 6:33 pm
Forum: Equipment Discussions
Topic: some good lens info
Replies: 29
Views: 5356

In your review of the Nikon 135mm f/4 bellows lens , my monitor shows prominent magenta fringing on some portions of the example image, while your findings indicate: "Chromatic Aberration: This lens show minimal color fringing in the center (about 0.25 pixel) and minimal on the periphery (0.10 - 0....
by ChrisLilley
Sat Jul 02, 2011 6:28 pm
Forum: Equipment Discussions
Topic: some good lens info
Replies: 29
Views: 5356

Doing numerical testing has taught me a lot over the last couple years. I just wanted to say that your macro-range ematest results are very interesting and I am not aware of any other sites where this is done - congratulations. Very clear and informative. A post on what adaptations you needed to do...
by ChrisLilley
Thu Jun 23, 2011 10:20 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Bug with Antlers (2nd image added)
Replies: 7
Views: 2672

The wings remind me of a very large insect I found in my room once, which I was told was an antlion. The antennae and other details were different from this.
by ChrisLilley
Thu Jun 23, 2011 10:14 am
Forum: Beginners Micro
Topic: Correct parts to go micro with Nikon D300 and bellows
Replies: 9
Views: 4976

Also regarding your PB-5, am I correct in assuming that both the front and rear bellows standards can be moved? If so, this is a very good thing. But from the pictures I’ve seen of PB-5 bellows, the front and rear portions of the bellows base are not connected by anything. PB-5 is a essentially a c...