Search found 141 matches

by JKT
Fri Aug 07, 2020 12:25 am
Forum: Equipment Discussions
Topic: Nikon TM 5X Objective Extension Distance Help
Replies: 5
Views: 112

Re: Nikon TM 5X Objective Extension Distance Help

Macro_Cosmos wrote:
Thu Aug 06, 2020 12:26 pm
Honestly speaking, the best way would be the ruler liveview method.
True. But for a starting point the calculation is useful.
by JKT
Thu Aug 06, 2020 8:15 am
Forum: Equipment Discussions
Topic: Nikon TM 5X Objective Extension Distance Help
Replies: 5
Views: 112

Re: Nikon TM 5X Objective Extension Distance Help

It is measured from the sensor to thread shoulder, BUT it is not 160mm. Instead it is 160mm-10mm = 150mm.
by JKT
Thu Aug 06, 2020 8:12 am
Forum: Equipment Discussions
Topic: Sony A7R with microscope lens
Replies: 29
Views: 540

Re: Sony A7R with microscope lens

The resolution calculation from Macro_Cosmos also assumes that the sharp image from the objective always covers the sensor. When it does not with the shorter tube, the final resolution can increase with the longer tube lens. Combine that with low resolution FF sensor and the above-mentioned 20x 0.75...
by JKT
Wed Aug 05, 2020 2:50 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Question regarding Nikon 10x
Replies: 7
Views: 255

Re: Question regarding Nikon 10x

I decided to use T2 as intermediate thread. So all the tube lenses have step-down ring to T2 (so far all are larger) and the microscope adapters use that, so I only need three ... so far. Customphototools mentioned above should have the T2 to microscope adapters in stock and the step-down rings you ...
by JKT
Sat Jul 25, 2020 12:06 pm
Forum: Equipment Discussions
Topic: 40/2.8 Apo-Componon @ 3.6x
Replies: 11
Views: 385

Re: 40/2.8 Apo-Componon @ 3.6x

Ill add another set of pictures with the same lens. In these the lens was used stacked on Schneider-Kreuznach Componon 150/5.6. (old black metal version with chrome filter thread) The resulting magnification is pretty close (3.75). - both lenses stopped down half stop - Canon EOS RP (full frame, 624...
by JKT
Thu Jul 23, 2020 9:02 am
Forum: Equipment Discussions
Topic: Nikon 2.5x M Plan vs. 40/2.8 Apo-Componon
Replies: 11
Views: 401

Re: Nikon 2.5x M Plan vs. 40/2.8 Apo-Componon

I'll have to try mine on extension then.

(Not impossible with enough magnification AS LONG AS they are fresh. Old ones - forget it.)
by JKT
Thu Jul 23, 2020 7:07 am
Forum: Equipment Discussions
Topic: Nikon 2.5x M Plan vs. 40/2.8 Apo-Componon
Replies: 11
Views: 401

Re: Nikon 2.5x M Plan vs. 40/2.8 Apo-Componon

NikonUser wrote:
Thu Jul 23, 2020 4:52 am
Amazing that JKT can spread such small moths.
Sometimes I get lucky. :lol:

Was the APO-Componon with extension or stacked? If former, I'll have to try it.
by JKT
Thu Jul 23, 2020 1:21 am
Forum: Equipment Discussions
Topic: Nikon 2.5x M Plan vs. 40/2.8 Apo-Componon
Replies: 11
Views: 401

Re: Nikon 2.5x M Plan

You really should switch systems as this is a good territory for Canon MP-E65. :wink: 02721 D6c Coleophora deauratella (170720)(Taalintehdas) [Id J Tabell].jpg Admittedly it depends on the resolution you want and the size of the moth. I only aim for 3000 px wide pictures, so MP-E can handle this and...
by JKT
Tue Jul 21, 2020 11:30 pm
Forum: Equipment Discussions
Topic: StackShot Skips trigger
Replies: 3
Views: 213

Re: StackShot Skips trigger

You'd get that effect if you were using mirror lock-up in camera, but StackShot wasn't configured to use two trigger signals for single shot.
by JKT
Tue Jul 14, 2020 8:57 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Photomicrography set-up with DSLR...Charles Krebs
Replies: 11
Views: 54831

Re: Photomicrography set-up with DSLR...Charles Krebs

The ocular lens is after the image formed by the objective (or objective & tube lens for infinity type). The camera sensor catches that real image.
by JKT
Thu Jul 02, 2020 11:06 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: extreme f-stop
Replies: 2
Views: 660

Re: extreme f-stop

MarkSturtevant wrote:
Thu Jul 02, 2020 5:38 am
I am reluctant to use a generator b/c of the noise.
I don't know just how silent you'd want, but the quality units have pretty low noise levels. My Honda EU10 won't bother anyone 100 m away. Admittedly good battery and LEDs would be a very nice combination.
by JKT
Wed Jun 17, 2020 6:27 am
Forum: Equipment Discussions
Topic: Stackshot vs. Camera - Optimal settings
Replies: 6
Views: 591

I don't have optimal result for you, but I have had similar issues with the RP. The settings I had to use in order to eliminate missing shots made the mirrorless actually slower than 7D.
by JKT
Sun Jun 14, 2020 1:11 pm
Forum: Equipment Discussions
Topic: Etendue Mejiro lenses on eBay now
Replies: 41
Views: 2878

IF I think I have a solution, I'll post the sketches for comments. Way cheaper that way. :D
by JKT
Fri Jun 12, 2020 12:16 am
Forum: Equipment Discussions
Topic: Etendue Mejiro lenses on eBay now
Replies: 41
Views: 2878

I agree that the SM2 solution is very handy ... as long as both lenses fit inside the tube. For the Macro Irises that is likely the case. The adjustment and lens change is not as easy I would like, though. The problem with the V38 to V38 adapter is that it is fixed length while the lenses are not. S...
by JKT
Thu Jun 11, 2020 2:45 pm
Forum: Equipment Discussions
Topic: Etendue Mejiro lenses on eBay now
Replies: 41
Views: 2878

RobertOToole wrote:Also V38 to V38 would be a good one also, for lens stacking coupling.
For Makro Iris lenses 37mm to 37mm reversing ring should work as well and that is coming soon.