Search found 4422 matches

by Lou Jost
Fri Aug 07, 2020 7:23 am
Forum: Equipment Discussions
Topic: Sony A7R with microscope lens
Replies: 29
Views: 571

Re: Sony A7R with microscope lens

Steve, that's a very important difference you point out between the microscope manufacturers' tube lenses and our home-made ones like the Raynox or ordinary camera lenses. In a microscope, the tube lens has to be far from the objective in order to leave space for the turret assembly, fluorescence cu...
by Lou Jost
Thu Aug 06, 2020 10:23 am
Forum: Photography Through the Microscope
Topic: Two days of pain
Replies: 13
Views: 189

Re: Two days of pain

Gosh, it looks deliberately made to cause maximum pain! That must have been terrible.
by Lou Jost
Thu Aug 06, 2020 7:01 am
Forum: Equipment Discussions
Topic: Sony A7R with microscope lens
Replies: 29
Views: 571

Re: Sony A7R with microscope lens

I get the feeling we don't disagree as much as may appear. You agree that high-NA objectives like the ones I mentioned would give excellent results with a 400mm lens. You also note that the QV objectives are excellent on a tube lens that is twice the focal length of the TL quoted for those objective...
by Lou Jost
Wed Aug 05, 2020 12:43 pm
Forum: Equipment Discussions
Topic: Sony A7R with microscope lens
Replies: 29
Views: 571

Re: Sony A7R with microscope lens

I personally haven't found any need to push magnifications using longer telephotos. With a 400, the magnification is doubled and NA remains the same. What objective are you going to couple it with? I can't think of too many beneficial scenarios I'm afraid. Perhaps there are some high NA objectives ...
by Lou Jost
Wed Aug 05, 2020 7:26 am
Forum: Equipment Discussions
Topic: Sony A7R with microscope lens
Replies: 29
Views: 571

Re: Sony A7R with microscope lens

Well I would like to use some old manual Nikon lenses (not for macro), definitely a 400mm and possibly 300mm and 200mm too. Those (particularly the old 400mm f/5.6 ED-IF) make good tube lenses when you need more magnification. Of course resolution on the subject doesn't increase when using using su...
by Lou Jost
Tue Aug 04, 2020 10:21 am
Forum: Equipment Discussions
Topic: Sony A7R with microscope lens
Replies: 29
Views: 571

Re: Sony A7R with microscope lens

I have a different philosophy than Macro_Cosmos. The wonderful thing about mirrrorless cameras is the freedom to use any brand of lens. Lens mounts (even good ones) are inexpensive compared to lenses, so I have a wide varierty of mounts. I can use any of my old legacy Nikon lenses, plus old manual F...
by Lou Jost
Mon Aug 03, 2020 6:43 pm
Forum: Equipment Discussions
Topic: Sony A7R with microscope lens
Replies: 29
Views: 571

Re: Sony A7R with microscope lens

Don't forget that you can use a slightly longer lens as the tube lens. What is the sensor size of your old camera? If it is an APS sensor, remember that a 300mm tube lens on FF will give you the same FOV as a 200mm on APS.
Lou
by Lou Jost
Sun Aug 02, 2020 4:57 pm
Forum: Equipment Discussions
Topic: Schneider macro varon 85/4.5 CAS @1x
Replies: 10
Views: 555

Re: Schneider macro varon 85/4.5 CAS @1x

Chris, that's an interesting observation. Infrared hot spots behave this way: they get worse on stopping down, and are worst in the center. I wonder if something similar is happening here. One partial solution in IR photography is the use of a very exact lens hood, so no stray light gets in. Forum m...
by Lou Jost
Sat Aug 01, 2020 8:30 am
Forum: Photography Through the Microscope
Topic: Diatoms
Replies: 11
Views: 372

Re: Diatoms

Actinoptychus heliopelta from Dunkirk, Maryland, USA, for example can be rather large.
Do you know if that would be a terrestrial one or an aquatic one?
by Lou Jost
Fri Jul 31, 2020 3:37 pm
Forum: Equipment Discussions
Topic: Nikon's 10x finite (cf, Nikon CFI)
Replies: 3
Views: 208

Re: Nikon's 10x finite (cf, Nikon CFI)

It sure looks good!
by Lou Jost
Fri Jul 31, 2020 3:33 pm
Forum: Photography Through the Microscope
Topic: Peacock feathers
Replies: 10
Views: 315

Re: Peacock feathers

I have most of them also without the backlight. I shot double stacks. ;-)
Excellent foresight!
by Lou Jost
Fri Jul 31, 2020 5:49 am
Forum: Photography Through the Microscope
Topic: Diatoms
Replies: 11
Views: 372

Re: Diatoms

Do you know what kind of environment these diatoms come from? Are they aquatic or terrestrial? Maybe that has something to do with size.
by Lou Jost
Thu Jul 30, 2020 4:01 pm
Forum: Photography Through the Microscope
Topic: Peacock feathers
Replies: 10
Views: 315

Re: Peacock feathers

Very nice, but personally I prefer the ones without the bright orange backlight though (for example, the third from the end). That orange color and high brightness does not go well with the darker greens and blues for me.
by Lou Jost
Thu Jul 30, 2020 3:07 pm
Forum: Photography Through the Microscope
Topic: Diatoms
Replies: 11
Views: 372

Re: Diatoms

Very micely done. I wish I could find "big" diatoms like those. Mine are barely visible even at 50x.