www.photomacrography.net :: View topic - Mitu QV 2.5x - any experience?
www.photomacrography.net Forum Index
An online community dedicated to the practices of photomacrography, close-up and macro photography, and photomicrography.
Photomacrography Front Page Amateurmicrography Front Page
Old Forums/Galleries
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
Mitu QV 2.5x - any experience?
Goto page 1, 2  Next
 
Post new topic   Reply to topic    www.photomacrography.net Forum Index -> Equipment Discussions
View previous topic :: View next topic  
Author Message
nielsgeode



Joined: 31 Jul 2012
Posts: 255
Location: Groningen, Netherlands

PostPosted: Tue Feb 28, 2017 11:50 am    Post subject: Mitu QV 2.5x - any experience? Reply with quote

Any experience with the Mitutoyo QV-HR2.5X?

http://www.mitutoyo.co.uk/vision-measuring-systems/accessories-3/02akt300

An NA of 0.21 at this magnification is a lot and I wonder how it compares to the well-known Mitu 2x NA 0.055. The FoV for "PRO machine" (whatever that may be) suggests very small sensors. Would it cover APS-C and if so, how would corner sharpness be?
Back to top
View user's profile Send private message MSN Messenger
rjlittlefield
Site Admin


Joined: 01 Aug 2006
Posts: 20165
Location: Richland, Washington State, USA

PostPosted: Tue Feb 28, 2017 1:11 pm    Post subject: Reply with quote

Notice the "f=100" engraved on the objective. That's the tube lens length that gives 2.5X. When used with a 200 mm tube lens, like standard for the Mitutoyo M Plan Apo's, this objective would be 5X NA 0.21 instead of NA 0.14 for the M Plan Apo 5X. The larger NA suggests that the QV objective would be sharper at image center. I have no idea how the corners would compare.

If you search Google with the query site:photomacrography.net Mitutoyo QV, you can find some postings about various QV objectives. They will probably add some info, but I don't think that any of them will exactly answer your question.

--Rik
Back to top
View user's profile Send private message Visit poster's website
nielsgeode



Joined: 31 Jul 2012
Posts: 255
Location: Groningen, Netherlands

PostPosted: Tue Feb 28, 2017 1:42 pm    Post subject: Reply with quote

rjlittlefield wrote:
Notice the "f=100" engraved on the objective. That's the tube lens length that gives 2.5X. When used with a 200 mm tube lens, like standard for the Mitutoyo M Plan Apo's, this objective would be 5X NA 0.21 instead of NA 0.14 for the M Plan Apo 5X. The larger NA suggests that the QV objective would be sharper at image center. I have no idea how the corners would compare.

If you search Google with the query site:photomacrography.net Mitutoyo QV, you can find some postings about various QV objectives. They will probably add some info, but I don't think that any of them will exactly answer your question.

--Rik


I've seen the f=100 Smile It's not difficult to use a 100mm tube lens instead of a 200mm. Do you think designing it for 100mm instead of 200mm would make it easier to obtain a high NA? Even then, 0.055 vs. 0.21 is a massive difference.
Back to top
View user's profile Send private message MSN Messenger
rjlittlefield
Site Admin


Joined: 01 Aug 2006
Posts: 20165
Location: Richland, Washington State, USA

PostPosted: Tue Feb 28, 2017 1:56 pm    Post subject: Reply with quote

nielsgeode wrote:
It's not difficult to use a 100mm tube lens instead of a 200mm.

True, and that's my point. If you stick a Mitutoyo M Plan Apo 5X NA 0.14 on 100 mm tube lens, you get 2.5X NA 0.14. So a pretty fair comparison is NA 0.14 for the M Plan Apo versus 0.21 for the QV, not so massive.

Comparing the QV on 100 mm tube lens at 2.5X, against the M Plan Apo on 200 mm tube lens at 2X, I'm quite sure you'll find that the M Plan Apo has a much wider field. It's the narrow field of the QV that makes it easier to obtain high NA.

--Rik
Back to top
View user's profile Send private message Visit poster's website
Beatsy



Joined: 05 Jul 2013
Posts: 1535
Location: Malvern, UK

PostPosted: Tue Feb 28, 2017 1:57 pm    Post subject: Reply with quote

The FoV values given on mitutoyo.co.uk are a bit weird, perhaps cause for concern?

View field: 2.5 x 1.88mm, 1.25 x 0.94mm, 0.41 x 0.31mm (0.62 x 0.47mm)
Remarks:The monitor magnification and field of view values are for the PRO machine.

The FoV of a 5x mitty on 135mm tube lens (3.375x) is 10mm on full frame and 7mm on APS-C. If it were put on a 100mm tube lens it would cover 14.4mm and 9.6mm respectively - but the corners and edges would be vignetted, with poor quality inside that.

The largest FoV quoted above is 2.5mm - so I suspect the FoV is miniscule and can't be pushed like it can with the M Plan APOs.

This all just theorising "out loud" on my part though...

edit: oops, Rik beat me to it
Back to top
View user's profile Send private message
nielsgeode



Joined: 31 Jul 2012
Posts: 255
Location: Groningen, Netherlands

PostPosted: Tue Feb 28, 2017 2:13 pm    Post subject: Reply with quote

Peter Lin posted on facebook on his timeline a photo made with the Mitutoyo QV 2.5x NA 0.14. I'm not sure what sensor he used, but it looks like the QV 0.14 does cover at least something like APS-C / M4/3 / ...

Of course it doesn't say anything about the 0.21, however, I would be surprised if there's a massive difference in coverage between the 0.14 and 0.21.
Back to top
View user's profile Send private message MSN Messenger
Lou Jost



Joined: 04 Sep 2015
Posts: 3831
Location: Ecuador

PostPosted: Fri Aug 11, 2017 1:08 pm    Post subject: Reply with quote

I'll revive this old thread to add that the new version of the QV, with NA=0.21, also has a much longer working distance than the old one that has an NA of 0.14. That is a bit unexpected.

I now have the old version waiting for me in Wisconsin. I think it must be telecentric since it is a measuring objective like the Nikon MM series.
_________________
Lou Jost
www.ecomingafoundation.wordpress.com
www.loujost.com
Back to top
View user's profile Send private message Visit poster's website
mjkzz



Joined: 01 Jul 2015
Posts: 1181
Location: California/Shenzhen

PostPosted: Sat Aug 12, 2017 4:15 am    Post subject: Reply with quote

I have the QV, but I am not sure if it is the HR version.

Yes, it requires 100mm tube (vs 200mm) and yes, it has relatively large NA of 0.14 (compared to others 2.5X). I believe it is an APO lens. Here is a comparison with a Chinese "APO", a regular achromatic 4x. The comparison was done with QV 2.5 on a 135mm f/2.8 lens.
_________________
https://www.facebook.com/groups/mjkzzfs/
Back to top
View user's profile Send private message Visit poster's website
mjkzz



Joined: 01 Jul 2015
Posts: 1181
Location: California/Shenzhen

PostPosted: Sat Aug 12, 2017 4:46 am    Post subject: Reply with quote

forgot to mention, I believe the QV series are telecentric and as tested (by me), this QV 2.5x one is indeed telecentric.
_________________
https://www.facebook.com/groups/mjkzzfs/
Back to top
View user's profile Send private message Visit poster's website
Lou Jost



Joined: 04 Sep 2015
Posts: 3831
Location: Ecuador

PostPosted: Sat Aug 12, 2017 5:22 am    Post subject: Reply with quote

Thanks for that info. I'm glad to get confirmation that it is telecentric and behaves like an apo lens. It also has along working distance. This is potentially a really great under-appreciated optic, until now quite inexpensive though hard to find.
_________________
Lou Jost
www.ecomingafoundation.wordpress.com
www.loujost.com
Back to top
View user's profile Send private message Visit poster's website
dolmadis



Joined: 07 Dec 2011
Posts: 642
Location: UK

PostPosted: Sat Aug 12, 2017 8:57 am    Post subject: Reply with quote

Looking for some information which I have been unable to find on Google.

I have just come across a 2.5x QV with no NA markings.

But it has a serial number or product number D60674.

Is it 0.14 or 0.21?

Thanks if anyone can advise.

BR


John
Back to top
View user's profile Send private message Send e-mail
Lou Jost



Joined: 04 Sep 2015
Posts: 3831
Location: Ecuador

PostPosted: Sat Aug 12, 2017 9:29 am    Post subject: Reply with quote

The QV objectives are fully marked with NA, etc. If yours doesn't have marks, that's suspicious. On mine (NA=0.14) the part # is 02ALA410
_________________
Lou Jost
www.ecomingafoundation.wordpress.com
www.loujost.com
Back to top
View user's profile Send private message Visit poster's website
harisA



Joined: 03 Jul 2011
Posts: 498
Location: Greece

PostPosted: Sat Aug 12, 2017 11:01 am    Post subject: Reply with quote

mjkzz wrote:
I have the QV, but I am not sure if it is the HR version.

Yes, it requires 100mm tube (vs 200mm) and yes, it has relatively large NA of 0.14 (compared to others 2.5X). I believe it is an APO lens. Here is a comparison with a Chinese "APO", a regular achromatic 4x. The comparison was done with QV 2.5 on a 135mm f/2.8 lens.


Since you own this objective will you please let us know if the mitotuyo qv 2.5x can cover a m4/3 or even a aps-c sensor?
Back to top
View user's profile Send private message
Lou Jost



Joined: 04 Sep 2015
Posts: 3831
Location: Ecuador

PostPosted: Sat Aug 12, 2017 11:05 am    Post subject: Reply with quote

Sure, but it will be several months before I can retrieve it from Wisconsin where it was shipped. I will give a full report after my next trip to the US. I have a bunch of other very cool lenses waiting for me too, including some unique ones that appear not to be known to our community. Lots to report!
_________________
Lou Jost
www.ecomingafoundation.wordpress.com
www.loujost.com
Back to top
View user's profile Send private message Visit poster's website
dolmadis



Joined: 07 Dec 2011
Posts: 642
Location: UK

PostPosted: Sat Aug 12, 2017 11:23 am    Post subject: Reply with quote

Lou Jost wrote:
The QV objectives are fully marked with NA, etc. If yours doesn't have marks, that's suspicious. On mine (NA=0.14) the part # is 02ALA410


Thank you for the warning.

I wonder what the part number is for the NA 0.21?

Just like to mention two others for sale with the D60XXX serial/part number.

http://www.ebay.com/itm/Used-Original-Mitutoyo-QV-Objective-2-5X-Microscope-Objective-Lens-C0X5-/182049944802?hash=item2a6305b4e2:g:s38AAOSwoudW4WtR

http://www.ebay.co.uk/itm/Mitutoyo-QV-objective-2-5x-Objektiv-D60851-/350565552407?hash=item519f55d117:g:gPgAAOSw91NTtkws

So perhaps there are three QV 2.5X legit versions out there.

BR

John
Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic   Reply to topic    www.photomacrography.net Forum Index -> Equipment Discussions All times are GMT - 7 Hours
Goto page 1, 2  Next
Page 1 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group