Search found 5945 matches

by Lou Jost
Fri Mar 29, 2024 2:19 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Mamiya 140mm macro lens
Replies: 25
Views: 2833

Re: Mamiya 140mm macro lens

The Mamiya "Z" lenses are the latest, designed for the RZ-67 (hence the "Z" in the lens name) instead of the RB-67. These two cameras differ in flange distance.

Lens chronology for the RB-67 is available here:
https://lens-db.com/system/mamiya-rb67/
by Lou Jost
Fri Mar 29, 2024 2:04 pm
Forum: Equipment Discussions
Topic: Lens recomendation for film reproduction
Replies: 63
Views: 1288

Re: Lens recomendation for film reproduction

Hmm, an extension ring will cause a similar problem as bellows, except for the lack of flexibility. If you want more magnification, I'd recommend using a 1.4x teleconverter. It will allow your lens to work as it should in terms of focal length and close range correction, while giving you a magnific...
by Lou Jost
Fri Mar 29, 2024 8:12 am
Forum: Equipment Discussions
Topic: Raynox DCR-5320 as tube lens - experiences and comparisons?
Replies: 5
Views: 251

Re: Raynox DCR-5320 as tube lens - experiences and comparisons?

Thank you so much, I really don't want to inconvenience you but that would be very helpful! Both those Mamiya lenses sound really great but I think I'd rather have the ability to use them short-focussed and/or bellows too (though mainly for full frame and bigger) - but I wonder how you mount them i...
by Lou Jost
Thu Mar 28, 2024 9:24 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Rio Bigal Reserve: Ecuador II
Replies: 4
Views: 96

Re: Rio Bigal Reserve: Ecuador II

Wonderful photos, as always! The feeding leech is especially remarkable! I've never seen that. I am confused about the ID. If I'm looking at the right photo, Paul calls it a "land planarian". But Wikipedia tells me that "leech" is phylum Annelida, while planarian is phylum Platyhelminthes. Visually...
by Lou Jost
Thu Mar 28, 2024 4:13 pm
Forum: Equipment Discussions
Topic: Lens recomendation for film reproduction
Replies: 63
Views: 1288

Re: Lens recomendation for film reproduction

The important thing here is the proven importance (now proven again) of maintaining the floating elements in their correct position for the desired magnification. This is a very general rule.
by Lou Jost
Thu Mar 28, 2024 12:52 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Rio Bigal Reserve: Ecuador II
Replies: 4
Views: 96

Re: Rio Bigal Reserve: Ecuador II

Wonderful evocative pictures, as always. The feeding leech is especially remarkable! I've never seen that.
by Lou Jost
Thu Mar 28, 2024 8:59 am
Forum: Equipment Discussions
Topic: MEJIRO GENOSSEN FL0530 4.0/110 FLOAT LENS TEST IS FINALLY ONLINE
Replies: 74
Views: 3502

Re: MEJIRO GENOSSEN FL0530 4.0/110 FLOAT LENS TEST IS FINALLY ONLINE

You probably know this, but be aware that optimization is not a simple process. The 85MV (and I presume also the FL0530) changes focal length as the CAS ring is adjusted. Thus if you simply adjust for maximum sharpness, you may just be optimizing critical focus. You need to perform something simila...
by Lou Jost
Thu Mar 28, 2024 5:07 am
Forum: Equipment Discussions
Topic: MEJIRO GENOSSEN FL0530 4.0/110 FLOAT LENS TEST IS FINALLY ONLINE
Replies: 74
Views: 3502

Re: MEJIRO GENOSSEN FL0530 4.0/110 FLOAT LENS TEST IS FINALLY ONLINE

my approach is to set up the subject and adjust the ring by eye at 100% live on the camera for maximum sharpness (actually I use a display monitor) without regard to the magnification scale. That is also my approach, and the recommended approach for medium format photographic lenses with floating e...
by Lou Jost
Wed Mar 27, 2024 8:02 pm
Forum: Equipment Discussions
Topic: Raynox DCR-5320 as tube lens - experiences and comparisons?
Replies: 5
Views: 251

Re: Raynox DCR-5320 as tube lens - experiences and comparisons?

I have made those comparisons shorty after Nathan published his tests on this forum, but it may take me a while to search for them on my old hard drives...currently for full frame my favorite 200mm tube lens is the Mamiya 200mm Apo for 6x4.5 and my favorite 250mm tube lens for FF is the Mamiya 250m...
by Lou Jost
Wed Mar 27, 2024 1:27 pm
Forum: Equipment Discussions
Topic: Raynox DCR-5320 as tube lens - experiences and comparisons?
Replies: 5
Views: 251

Re: Raynox DCR-5320 as tube lens - experiences and comparisons?

I have made those comparisons shorty after Nathan published his tests on this forum, but it may take me a while to search for them on my old hard drives...currently for full frame my favorite 200mm tube lens is the Mamiya 200mm Apo for 6x4.5 and my favorite 250mm tube lens for FF is the Mamiya 250mm...
by Lou Jost
Sat Mar 23, 2024 5:24 am
Forum: General Discussion Forum and Community Announcements
Topic: Loss of Robert OToole
Replies: 29
Views: 866

Re: Loss of Robert OToole

Oh noooooo.....this is heartbreaking news. He was such a generous and thoughtful person, and devoted a huge amount of time to us on this forum. He was always open-minded and deeply interested in new photographic techniques. Besides doing the best macro tests on the internet, he was himself a very ar...
by Lou Jost
Fri Mar 22, 2024 5:18 pm
Forum: Equipment Discussions
Topic: Lens recomendation for film reproduction
Replies: 63
Views: 1288

Re: Lens recomendation for film reproduction

"Absolutely, macro lens set at minimal extension, i,e. Infinity focus when mounted on the bellows which also at minimal extension. Thank You Rik for suggesting the correct term “infinity focus” …." Yes, and that is the reason I made my comments about floating elements being out of place. The results...
by Lou Jost
Fri Mar 22, 2024 9:59 am
Forum: Equipment Discussions
Topic: Lens recomendation for film reproduction
Replies: 63
Views: 1288

Re: Lens recomendation for film reproduction

I will consider you suggestion of using medium format bellows with reverse mounting of macro lens. Actually I was suggesting the medium or large format bellows with the lens mounted inside it IN THE FORWARD DIRECTION, not reversed, with the bellows extension set to maintain the correct flange-to-se...
by Lou Jost
Thu Mar 21, 2024 9:17 pm
Forum: Equipment Discussions
Topic: Lens recomendation for film reproduction
Replies: 63
Views: 1288

Re: Lens recomendation for film reproduction

Using repurposed Nikon Multiphot base for slide copying with Nikon Z6II attached to Nikon bellows PB-4, Micro Nikkor 60 mm 2.8 (got this at KEH @ $140) and flat LED light source (Apurture Amaran at 6000 k). Both slide holder and macro lens hood 3D printed. The setup yielded very good quality digita...