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Not All that Glitters is Gold
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 20169
Location: Richland, Washington State, USA

PostPosted: Thu May 17, 2012 3:10 pm    Post subject: Reply with quote

naturephoto1 wrote:
The price of these lenses has dropped to $34.95 with 95 still available.
...
For those in possession of the lens, do you think that this is a good enough performer for the price?

Mine seemed like a good buy at $55. It can only have gotten better at $35.

--Rik
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Chris S.
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Joined: 05 Apr 2009
Posts: 3352
Location: Ohio, USA

PostPosted: Thu May 17, 2012 10:54 pm    Post subject: Reply with quote

A specimen of this lens is passing through my hands, and I had the opportunity to give it a quick whirl last night. I compared it with a Nikon 20x/0.40 ELWD finite objective--the same model Rik tested this JML against. Not that I doubted Rik's findings--just had a hankering to see what this inexpensive JML lens would do in my own hands. My comparison was less rigorous than Rik's, but produced similar results.

NB, I compared both lenses on bellows with the same amount of extension: 200mm from lens shoulder to sensor. Since Rik found that the JML produced 20x magnification at 222mm extension, I was using it at slightly lower magnification, and perhaps a bit out of its sweet spot.

From this exercise, my takeaway: In the center, resolution is about equal between these two lenses. The JML's sharpness degraded quickly away from the center, while the Nikon held up well to the edges. This might not be a huge detriment to photographers doing portraits of insects or other centered subjects.

Chromatic aberration is very different between the two lenses. With the Nikon, CA is axial (purple fringing), and can be troublesome to correct in post. With the JML, it is transverse, and easy to correct in post (as Rik said).

Neither of these lenses really competes with the Mitutoyo MPlan Apo 20x, which is remarkably free of CA and has about twice the working distance. But the Mitty is an infinite objective, and so requires an additional converging lens. It is not suitable on a straight bellows setup.

Putting it into perspective, this JML costs $35. The Nikon 20x ELWD is, if you can find it, about ten times the cost (I see one listed as BIN for $340, which seems a bargain to me, as I paid $500 for the copy tested here). The Mitutoyo 20x lists for $1900, though it can sometimes be purchased second-hand for a third to half that price (I see that one sold recently for $750).

At this price, I think this JML 20x is an outstanding bargain. Respectable 20x for $35? This is the price of a cheap diopter. Anyone working on a bellows who doesn't already have a way of getting to 20x might be well-advised to take a look at it.

Cheers,

--Chris
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JW



Joined: 23 Feb 2011
Posts: 152
Location: New Haven, CT, USA

PostPosted: Fri May 18, 2012 9:53 am    Post subject: Reply with quote

For my purposes this lens works great, I ran a few tests here.

Curiously, ZS Pmax processing has less CA than in a Dmap processing
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soldevilla



Joined: 16 Dec 2010
Posts: 551
Location: Barcelona, more or less

PostPosted: Fri May 18, 2012 2:25 pm    Post subject: Reply with quote

Chris S. wrote:
I think this JML 20x is an outstanding bargain.


Drool
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naturephoto1



Joined: 13 Nov 2011
Posts: 509
Location: Breinigsville, PA

PostPosted: Mon May 21, 2012 5:46 am    Post subject: Reply with quote

I finally bit the bullet and ordered one of these this morning, I couldn't resist for $35 plus $9 shipping. Thanks to Chris, Conny, Craig, and others.

Rich
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Last edited by naturephoto1 on Mon May 21, 2012 5:48 am; edited 1 time in total
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shrek



Joined: 01 Nov 2009
Posts: 99
Location: Toulouse (France)

PostPosted: Mon May 21, 2012 6:56 am    Post subject: Reply with quote

75 US dollar for shipping to France Evil or Very Mad

jp
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naturephoto1



Joined: 13 Nov 2011
Posts: 509
Location: Breinigsville, PA

PostPosted: Mon May 21, 2012 6:59 am    Post subject: Reply with quote

shrek wrote:
75 US dollar for shipping to France Evil or Very Mad

jp


I am sure that one of us here in the US could send the lens to you via the USPS for a substantial savings.

Rich
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canonian



Joined: 31 Aug 2010
Posts: 890
Location: Rotterdam, Netherlands

PostPosted: Mon May 21, 2012 12:10 pm    Post subject: Reply with quote

naturephoto1 wrote:

I am sure that one of us here in the US could send the lens to you via the USPS for a substantial savings.


If so... I'm also interested in obtaining one.
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Fred
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naturephoto1



Joined: 13 Nov 2011
Posts: 509
Location: Breinigsville, PA

PostPosted: Mon May 21, 2012 12:23 pm    Post subject: Reply with quote

canonian wrote:
naturephoto1 wrote:

I am sure that one of us here in the US could send the lens to you via the USPS for a substantial savings.


If so... I'm also interested in obtaining one.


Hi Fred,

As mentioned, some of us in the US could help out. I know that Chris S. and I have helped out shipping things to members in Europe. Lenses could be ordered but, I could not ship them out till near the middle of next week if they arrived this week.

Rich
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shrek



Joined: 01 Nov 2009
Posts: 99
Location: Toulouse (France)

PostPosted: Mon May 21, 2012 1:01 pm    Post subject: Reply with quote

Very good idea Very Happy

jp
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naturephoto1



Joined: 13 Nov 2011
Posts: 509
Location: Breinigsville, PA

PostPosted: Mon May 21, 2012 1:12 pm    Post subject: Reply with quote

I just received a PM from Fred about making a purchase. Why don't those interested let me know who is interested in ordering the lenses. We can make arrangements for ordering a number of lenses all at once. I can confirm the cost of shipping as an example via USPS flat rate Priority International shipping. I believe that shipping would be around $16 or $17 US, but we can not insure packages via this packaging. I do not think that it makes much sense to try to insure a $35 item.

Payment could be made via Paypal.

Lets try to get an idea as to how many want to get in on this way of making a purchase. Once we have a better idea and I confirm the cost of shipping I can take payments via Paypal or if it is preferred 2 payments via Paypal could be made one for the purchase of the lens and the shipping to me. If we just used the usual Paypal means of payment rather than the buyer making payment as a gift, then I would have to add about 4.1% for Paypal fees.

Rich
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abpho



Joined: 17 Aug 2011
Posts: 1433
Location: Earth

PostPosted: Mon May 21, 2012 2:32 pm    Post subject: Reply with quote

I love how the community got onto this lens. Analyzed it. Figured out what it is. And now helping others across the pond acquire them.

Way to go people. Very Happy
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vendav



Joined: 31 Jul 2008
Posts: 76

PostPosted: Tue May 22, 2012 2:17 pm    Post subject: Reply with quote

Hi Rich,

I would most certainly be interested in obtaining a copy of this lens, and as I'm in the UK would appreciate the multiple purchase and onward shipment idea.
Please count me in when assessing numbers, I can PM you with personal details as required.

Kind regards,
David
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naturephoto1



Joined: 13 Nov 2011
Posts: 509
Location: Breinigsville, PA

PostPosted: Tue May 22, 2012 2:20 pm    Post subject: Reply with quote

vendav wrote:
Hi Rich,

I would most certainly be interested in obtaining a copy of this lens, and as I'm in the UK would appreciate the multiple purchase and onward shipment idea.
Please count me in when assessing numbers, I can PM you with personal details as required.

Kind regards,
David


Hi David,

I will include you on the list at this point. When I get a better idea as to the number I will place a bid for all of the lenses at once. I will get your info later.

Rich
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Richard A. Nelridge

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vendav



Joined: 31 Jul 2008
Posts: 76

PostPosted: Tue May 22, 2012 3:04 pm    Post subject: Reply with quote

Hi Rich,

Many thanks, looking forward to hearing from you.

Kind regards,
David
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