On Ven, 3 apr 1998 7:27, ONLYOLY BW <mailto:ONLYOLYBW@xxxxxxx> wrote:
>I would like to come up with a procedure to test my own lenses against
each
>other at Close-up / Macro ranges of 0.5X to 1x mag. I would like to test
both
>Flat and 3-D objects. Here are some of my questions. All testing will be
>done on a Kaiser copy stand with a OM 4T.
Cool!
>
>Should I use flash, the lamps or take it outside?
the flash and lamps solutions look more reproductible.
>What slide film should I use?
>Is Sensia 100 OK or should I go to 25 ASA?
It is OK, may choose KM, PKM or RVP for very slight better resolution.
>What subject should I use for flat?
A banknote (with many colors), a stamp, a contact print, a neg (if you can
dia-enlight).
>What subject should I use for 3-D?
Why? maybe a computer board, or a coin.
>Should the subject be Black & White or Color?
Color, and with a variety of.
>What do the professional labs use?
Dunno
>Evaluation can be done with a Peak 4X loupe and light table or should I
borrow
>a 8X or 10X?
For 0.5 or 1 ratios the difference should be very visible...
>I could scan them into Photoshop?
>Should I mount the slides or leave them uncut?
>What should I look for in the slides?
Color, center-corner, contrast, "reality", resolution, what you like.
>
>Any help would be greatly appreciated, and a fun project for this weekend.
>For those interested, I plan to compare my 50mm macro's both f3.5 &f2.0 w/
>25mm Ext tube,
Would be interesting to compare the 0.5 reproductions with and without the
extension tube.
135mm & 80mm macro with 65-116 auto tube, Vivitar Series 1 90mm
>w/1:1 adapter, 65-116 auto tube with 200mm f4,135 f2.8 100mm f2.8 and 85 f
>2.0. I will also try a 2Xa converter with various Tele lenses.
>WOW this may take more than a weekend!
>Please give me some ideas.
Try wide open, f/4 and f/8.
Marco
mailto:tom@xxxxxxxxxxxx
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|