Search found 595 matches

by dmillard
Sun Oct 07, 2018 8:18 am
Forum: Equipment Discussions
Topic: Stacked Lens vs APO objectives at 4x with Surprising Results
Replies: 88
Views: 8858

typestar wrote:
This community is very fast: ;-)
The challenge now is locating either of the Xenons! :wink:
by dmillard
Thu Oct 04, 2018 8:53 pm
Forum: Equipment Discussions
Topic: Stacked Lens vs APO objectives at 4x with Surprising Results
Replies: 88
Views: 8858

Thank you for another noteworthy test! What was the working distance with the stacked pair?
by dmillard
Thu Oct 04, 2018 8:20 pm
Forum: Equipment Discussions
Topic: Lee diffusers?
Replies: 14
Views: 1550

I use a variety of Lee filters, primarily as cylinders on my Mitutoyo and Olympus objectives. I often combine them with an inner layer of 214 Tough Spun to further cut interior reflections, or selectively mask them with black cardstock. Like Harald, I have found them to be very color neutral, but I ...
by dmillard
Mon Oct 01, 2018 11:03 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Foraminifera fossils
Replies: 5
Views: 1445

These are very nice images Leo96! And I also appreciated Enrico's erudite clarification of the subject material.
by dmillard
Tue Sep 25, 2018 1:35 pm
Forum: Equipment Discussions
Topic: 5x Magnification Ideas and Suggestions
Replies: 27
Views: 3372

A quick test of the 7.5X with an Apo-Symmar 135mm f/5.6 shows that it easily covers the full frame of a Sony A7Rii at 4.91X. I think the darkened corners seen here may result from mechanical vignetting somewhere else in my system (the lens aperture, PB-6 bellows, or the Nikon-Sony adapter), rather t...
by dmillard
Sat Sep 22, 2018 9:28 pm
Forum: Equipment Discussions
Topic: 5x Magnification Ideas and Suggestions
Replies: 27
Views: 3372

Re: 5x Magnification Ideas and Suggestions

RobertOToole wrote:Any ideas or suggestions for a 5x test?
Possibly a Nikon CFI Plan Apo 4/0.20 or an Olympus UPlanApo 4/0.16 pushed to approximately 5x with tube lenses of the appropriate focal lengths (250mm and 225mm, respectively).
by dmillard
Sat Sep 01, 2018 5:23 am
Forum: Equipment Discussions
Topic: (LSA || DCR150 || ITL200) ? FF : CROP
Replies: 58
Views: 5438

Hi David, Many thanks for the test! Can you change the power of the Vivitar 283? If yes, which value have you used? I’m asking for that because your diffuser of Leelux 400 absorbs a lot of light. BTW, what is a paper Waterhouse stop ? BR, ADi The Leelux 400 absorbs a lot, plus I used an inner cylin...
by dmillard
Sat Sep 01, 2018 5:07 am
Forum: Equipment Discussions
Topic: (LSA || DCR150 || ITL200) ? FF : CROP
Replies: 58
Views: 5438

Adalbert wrote:Hi Lou,
Very nice moth scales!
I agree - excellent illustrations of the capabilities of the lens and the camera!
by dmillard
Fri Aug 31, 2018 8:39 pm
Forum: Equipment Discussions
Topic: (LSA || DCR150 || ITL200) ? FF : CROP
Replies: 58
Views: 5438

Hello everybody, Has anybody tested the tube-lenses 360mm / 300mm / 240mm ? Hello Adalbert, I had hoped to do show you a comparison between some large format lenses in those focal lengths, but unfortunately found I had misplaced a few important components for my Aristophot stand, which I have negle...
by dmillard
Wed Aug 29, 2018 5:47 am
Forum: Equipment Discussions
Topic: (LSA || DCR150 || ITL200) ? FF : CROP
Replies: 58
Views: 5438

What about this one (OK, is expensive but APO) https://www.ebay.de/itm/Rodenstock-Apo-Ronar-9-360mm-14inch-Objektiv-lens-90170/332098746576?hash=item4d52a0b8d0:g:CnYAAOSw5cNYg1lT BR, ADi I previously found the Apo-Ronar 240mm f/9 to be very free of chromatic aberration, but my copy was one that may...
by dmillard
Tue Aug 28, 2018 10:51 am
Forum: Equipment Discussions
Topic: (LSA || DCR150 || ITL200) ? FF : CROP
Replies: 58
Views: 5438

I'd like to reinforce what Jorgen said about focal length vs format size. If you are happy with a given objective on a tube lens of focal length 200mm on APS, you will get exactly that same image, with same corner quality, filling the FF sensor if you use change to a tube lens of 300mm. I am using ...
by dmillard
Sat Aug 11, 2018 11:41 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Scotch Thistle
Replies: 5
Views: 1153

Really nice images!
by dmillard
Thu Aug 09, 2018 7:55 am
Forum: Equipment Discussions
Topic: Tube Lens Test With MITUTOYO 5X M Plan APO
Replies: 66
Views: 9475

I hope this question doesn't take the thread off topic, if it does I'll gladly start a new thread. It should be an easy one to answer by those more versed in tube lenses than I: is image circle affected by the tube lens or is it dictated by the objective? From my experience, it's affected by both. ...
by dmillard
Wed Aug 08, 2018 6:46 pm
Forum: Equipment Discussions
Topic: Tube Lens Test With MITUTOYO 5X M Plan APO
Replies: 66
Views: 9475

That little lens continues to amaze. I've finished up shooting two big tests that I haven't published yet. 17 lenses at 2.1x and 8 lenses (5 lenses and 3 objectives) at 3x. Can you guess the top lens in each of those? It took a NA0.20 objective to beat the Minolta, it beat a Nikon Objective and was...
by dmillard
Wed Aug 08, 2018 6:00 pm
Forum: Equipment Discussions
Topic: Tube Lens Test With MITUTOYO 5X M Plan APO
Replies: 66
Views: 9475

Hello Robert, Just another confirmation - I saw your earlier thread about the 6.7X magnification you got when setting up the ITL200 following Thorlabs' diagrams, and ran a test this afternoon using this tube lens in both orientations with a 10X Mitty. I got 9.9X using it in both directions. This may...