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Microscope Objective Clarification
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Deanimator



Joined: 23 Oct 2012
Posts: 367
Location: Rocky River, Ohio, U.S.A.

PostPosted: Sat Nov 18, 2017 4:54 pm    Post subject: Reply with quote

Pau wrote:
Don't buy the 4 objectives set: they are inferior, see the difference with the Plan objective, and you only could profit for macro the 4X and 10X and both likely not very adequate for the task, they are entry level optics to work in cheap school grade microscopes

I'll stick with the single 4x finite.

I had read the review before it was reposted here, and was impressed. It seems like a very good value for them money.
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mawyatt



Joined: 22 Aug 2013
Posts: 988

PostPosted: Sat Nov 18, 2017 5:21 pm    Post subject: Reply with quote

The AmScope 4X finite is like a "Jewel in the rough" someone said!! The WeMacro 4X Infinite is also pretty good considering the cost. Saw a Nikon 200mm F4 Q in good shape go for $24 + $6 shipping yesterday, so if you can find a Canon equivalent, or as Chris mentioned the Raynox 150, you should be go to go either way, finite or infinite!!

Best,

Mike
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Deanimator



Joined: 23 Oct 2012
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Location: Rocky River, Ohio, U.S.A.

PostPosted: Sat Nov 18, 2017 5:33 pm    Post subject: Reply with quote

mawyatt wrote:
The AmScope 4X finite is like a "Jewel in the rough" someone said!! The WeMacro 4X Infinite is also pretty good considering the cost. Saw a Nikon 200mm F4 Q in good shape go for $24 + $6 shipping yesterday, so if you can find a Canon equivalent, or as Chris mentioned the Raynox 150, you should be go to go either way, finite or infinite!!

Best,

Mike

I'll probably work up an infinite rig eventually.

I'm going to start with finite because it's easier and cheaper to start.

I just got shifted to the 9:00pm to 5:30am shift at work, so reading and indoor macro are about all I'll be doing for the foreseeable future.
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Deanimator



Joined: 23 Oct 2012
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Location: Rocky River, Ohio, U.S.A.

PostPosted: Sun Nov 19, 2017 2:45 pm    Post subject: Reply with quote

I just ordered all of the finite gear (and a Foreman grill for my mother).

I got,

from Amazon:

  1. 4x Amscope objective
  2. two sets of M42 tubes
  3. EOS to M42 adapter


from eBay:

  1. M42 to RMS adapter
  2. M42 bellows


Working from 9:00pm to 5:30am for a 24/7 business doesn't afford me much opportunity for amusement. This stuff should occupy the leisure time I have.
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Deanimator



Joined: 23 Oct 2012
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Location: Rocky River, Ohio, U.S.A.

PostPosted: Sun Nov 19, 2017 7:22 pm    Post subject: Reply with quote

ChrisR wrote:
Your zoom will be far from ideal, probably only working without vignetting at the 300mm end.

I've got an old Minolta 100-200 push-pull manual zoom lying around.

Would that work?
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ChrisR
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Joined: 14 Mar 2009
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Location: Near London, UK

PostPosted: Mon Nov 20, 2017 4:49 am    Post subject: Reply with quote

That stands a better chance,( if you can adapt a Minolta to your camera Neutral ) because it's more to do with the construction of the lens when you pull away from the longes end, than the actual FL, which matters.

I have an old 80-200 Nikkor which only just vignettes on full frame.

If you have tubes already, you could look for that Sigma close-up diopter. It's 52mm both sides so relatively easy to adapt to. They're often pretty cheap. Our member Saul found them to be very good.
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Pau
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Location: Valencia, Spain

PostPosted: Mon Nov 20, 2017 6:23 am    Post subject: Reply with quote

For a Canon EOS Minolta SR-mount is a bad idea because its Flange focal distance of 43.50 mm vs 44mm of Canon EF mount so if you find the adapter it will not focus to infinite or it will be bundled with a bad quality lens to do so, bad option in both cases
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Deanimator



Joined: 23 Oct 2012
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PostPosted: Mon Nov 20, 2017 8:19 am    Post subject: Reply with quote

Pau wrote:
For a Canon EOS Minolta SR-mount is a bad idea because its Flange focal distance of 43.50 mm vs 44mm of Canon EF mount so if you find the adapter it will not focus to infinite or it will be bundled with a bad quality lens to do so, bad option in both cases

It's an MD mount. It dates back to 1981 when I used it to take pictures of North Korean guardposts.
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Pau
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PostPosted: Mon Nov 20, 2017 10:17 am    Post subject: Reply with quote

SR and MD are different versions of the same mount, what I said still applies

https://en.wikipedia.org/wiki/Minolta_SR-mount
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Deanimator



Joined: 23 Oct 2012
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PostPosted: Mon Nov 20, 2017 10:20 am    Post subject: Reply with quote

Pau wrote:
SR and MD are different versions of the same mount, what I said still applies

https://en.wikipedia.org/wiki/Minolta_SR-mount

Thanks.
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Deanimator



Joined: 23 Oct 2012
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Location: Rocky River, Ohio, U.S.A.

PostPosted: Wed Nov 22, 2017 5:25 pm    Post subject: Reply with quote

The following have arrived:

  • M42 bellows
  • EOS to M42 adapter
  • Amscope 4x objective.

I'm still waiting on the RMS to M42 adapter and the M42 extension tubes.
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Deanimator



Joined: 23 Oct 2012
Posts: 367
Location: Rocky River, Ohio, U.S.A.

PostPosted: Fri Nov 24, 2017 3:31 pm    Post subject: Reply with quote

I got the two M42 extension tube sets and the M42 to RMS adapter today.

Just for giggles, I did a live view test with objective on the end of the two sets of M42 extension tubes.

For a subject I used a 148gr. .38 Special wadcutter round stood on its nose. The rim looked like the edge on view of a manhole cover.

I think I'm going to have a lot of fun with this.
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