An ULTRA macro in Pentax mount!

**hjoseph7** · 01-05-2015, 06:57 PM

Please don't aggravate my L.B.A...

mee · 01-05-2015, 07:34 PM

Originally posted by mtux

There should be a reason for that, because canon's ultra macro lens which goes up to 5:1 macro has a focal length of 50 or 60mm

Canon's MPE has a focal length of 65mm.. but as you mention that one does 5:1!

I guess one could get close to that with a raynox and this lens... but then you are back into the 'cludgy' category of having to use multiple devices to get what Canon does in a single lens.

starjedi · 01-05-2015, 08:10 PM

Originally posted by Quicksand

I am LITERALLY Laughing Out Loud at their company logo:

Um . . .

Venus is just a start-up Chinese company with only several people ( only one initially for the 60mm 2.8 prototype) . But they are indeed trying their best to create some interesting products (60mm F2.8 2:1, 15mm Shifted Wide Angle with 5:1 ratio (reversed)). I really hope they have their own success and then provide fresh air into the lens market.

mtux · 01-05-2015, 08:53 PM

Originally posted by mee

I guess one could get close to that with a raynox and this lens... but then you are back into the 'cludgy' category of having to use multiple devices to get what Canon does in a single lens.

Yet the Canon MPE doesn't go anything farther than 1:1 I guess! So you still need to have another lens for other stuff or normal macro things.

NicoleC · 01-05-2015, 09:02 PM

Originally posted by Quicksand

I am LITERALLY Laughing Out Loud at their company logo:

Fiverr to the rescue!

Not a Number · 01-05-2015, 09:09 PM

Originally posted by starjedi

The 15mm shifted wide angle with 5:1 reverse magnfication ratio is indeed a very interesting item. Unfortunately so far not in pentax mount as I noticed.

Where did you get this information from? It is not on the venuslens.net website.

Originally posted by wombat2go

The SMC Pentax -M Dental Macro 1:4 100mm goes from infinity to 2: 1, with its magnetic close up kit

Scales:
1/10 to 1/2
1/2 to 1 with the red ds25
1.2 to 2 with the yellow DS9

Venus Lens: f/2.8 Infinity to 2x macro, no adapter, extension tube or add-on lens needed.

vs

Pentax Dental Macro: f/4 Infinity to 0.5x, 1x and 2x (no infinity) with add-on lens or extension tubes

Docrwm · 01-05-2015, 09:15 PM

Interesting. It also apparently has 14 blades.

The lens was designed with a strong metal exterior, 9 elements in 7 groups for image sharpness and color rendition, 2 major lens groups to reduce barrel distortion, and a 14-blade close-to-circular aperture for creamy bokeh.

marcusyoung · 01-05-2015, 10:15 PM

Interesting and good news for Pentax macro lovers. That is all I need, 2 X mag. and the price is just great.

If the company could comes out with a dual twin flash light, specifically for this lens, that would have been near perfect

marcus

jedie · 01-06-2015, 03:07 AM

Does is have A-Contacts?!?

Clavius · 01-06-2015, 03:21 AM

Mount it on a Q! I love mounting the DFA 100mm 2.8 on a Q and getting super magnification with lots of (for macro anyway) DOF.

macTak · 01-06-2015, 03:26 AM

The Pentax 100/4 is 1:2 (half life-size) not 2:1, as I recall. This is an interesting idea, but to be honest how often do you need to go beyond 1:1? If you are doing so, odds are you have a setup with a tripod, lighting, etc. where it is not really going to trouble you to use bellows/extension tubes. It is also such a challenge correct for aberrations well at such wildly different magnifications. The Bokina did infinity to 1:2, with added optical adaptor to do 1:2-1:1 in order to correct the aberrations at all ranges to a high degree. As to the optical design, it is a double-gauss based designed (like, e.g., the Bokina). I look forward to seeing the results (though with a manufacturer like this, QC is perhaps as big a question as anything). Here's the optical design and the MTF (for 10 and 30 lp/mm), though it does not gives the magnification it is for (still looks very impressive). The question is how does the performace hold up all over its range (as well as how consistant will the QC be).

Trudger1272 · 01-06-2015, 04:26 AM

...and when I almost have myself convinced the DA*55 should be my last lens!

jedie · 01-06-2015, 04:28 AM

I asked through eBay: It hat no A-Contacts...

Not a Number · 01-06-2015, 07:41 AM

Originally posted by macTak

The Pentax 100/4 is 1:2 (half life-size) not 2:1, as I recall.

The Dental version came with a set of close-up lenses. When used with the DS9 (yellow ring) it goes to 2x

https://hindesite.wordpress.com/articles/smc-pentax-a-dental-macro-1004-0/

Does anybody know how many aperture blades the SMC 100mm f/4 macros have?

wombat2go · 01-06-2015, 08:58 AM

Originally posted by Not a Number

Does anybody know how many aperture blades the SMC 100mm f/4 macros have?

6 curved

01-05-2015, 10:15 PM	#23
marcusyoung Veteran Member Join Date: May 2007 Location: singapore Photos: Gallery \| Albums Posts: 1,123	macro Interesting and good news for Pentax macro lovers. That is all I need, 2 X mag. and the price is just great. If the company could comes out with a dual twin flash light, specifically for this lens, that would have been near perfect marcus

01-06-2015, 03:21 AM	#25
Clavius Veteran Member Join Date: Feb 2011 Location: De Klundert Photos: Gallery Posts: 4,150	Mount it on a Q! I love mounting the DFA 100mm 2.8 on a Q and getting super magnification with lots of (for macro anyway) DOF. Last edited by Clavius; 01-06-2015 at 03:30 AM.

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01-05-2015, 06:57 PM	#16
hjoseph7 Site Supporter Join Date: May 2014 Location: Minnesota Photos: Gallery \| Albums Posts: 2,047	Please don't aggravate my L.B.A...

01-05-2015, 07:34 PM	#17
mee Veteran Member Join Date: May 2010 Posts: 7,403	Originally posted by mtux There should be a reason for that, because canon's ultra macro lens which goes up to 5:1 macro has a focal length of 50 or 60mm Canon's MPE has a focal length of 65mm.. but as you mention that one does 5:1! I guess one could get close to that with a raynox and this lens... but then you are back into the 'cludgy' category of having to use multiple devices to get what Canon does in a single lens.

01-05-2015, 08:10 PM	#18
starjedi Veteran Member Join Date: Dec 2013 Location: New Jersey Posts: 932	Originally posted by Quicksand I am LITERALLY Laughing Out Loud at their company logo: Um . . . Venus is just a start-up Chinese company with only several people ( only one initially for the 60mm 2.8 prototype) . But they are indeed trying their best to create some interesting products (60mm F2.8 2:1, 15mm Shifted Wide Angle with 5:1 ratio (reversed)). I really hope they have their own success and then provide fresh air into the lens market.

01-05-2015, 08:53 PM	#19
mtux Veteran Member Join Date: Apr 2013 Location: the Netherlands Photos: Gallery \| Albums Posts: 2,444	Originally posted by mee I guess one could get close to that with a raynox and this lens... but then you are back into the 'cludgy' category of having to use multiple devices to get what Canon does in a single lens. Yet the Canon MPE doesn't go anything farther than 1:1 I guess! So you still need to have another lens for other stuff or normal macro things.

01-05-2015, 09:02 PM	#20
NicoleC Veteran Member Join Date: Oct 2013 Location: Madison, AL Posts: 448	Originally posted by Quicksand I am LITERALLY Laughing Out Loud at their company logo: Fiverr to the rescue!

01-05-2015, 09:09 PM	#21
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	Originally posted by starjedi The 15mm shifted wide angle with 5:1 reverse magnfication ratio is indeed a very interesting item. Unfortunately so far not in pentax mount as I noticed. Where did you get this information from? It is not on the venuslens.net website. Originally posted by wombat2go The SMC Pentax -M Dental Macro 1:4 100mm goes from infinity to 2: 1, with its magnetic close up kit Scales: 1/10 to 1/2 1/2 to 1 with the red ds25 1.2 to 2 with the yellow DS9 Venus Lens: f/2.8 Infinity to 2x macro, no adapter, extension tube or add-on lens needed. vs Pentax Dental Macro: f/4 Infinity to 0.5x, 1x and 2x (no infinity) with add-on lens or extension tubes

01-05-2015, 09:15 PM	#22
Docrwm Veteran Member Join Date: Sep 2010 Location: Somewhere in the Southern US Photos: Gallery \| Albums Posts: 12,285	Interesting. It also apparently has 14 blades. The lens was designed with a strong metal exterior, 9 elements in 7 groups for image sharpness and color rendition, 2 major lens groups to reduce barrel distortion, and a 14-blade close-to-circular aperture for creamy bokeh.

01-06-2015, 03:07 AM	#24
jedie Junior Member Join Date: Mar 2011 Location: Germany Posts: 46	Does is have A-Contacts?!?

01-06-2015, 03:26 AM	#26
macTak Veteran Member Join Date: Apr 2010 Photos: Gallery Posts: 759	The Pentax 100/4 is 1:2 (half life-size) not 2:1, as I recall. This is an interesting idea, but to be honest how often do you need to go beyond 1:1? If you are doing so, odds are you have a setup with a tripod, lighting, etc. where it is not really going to trouble you to use bellows/extension tubes. It is also such a challenge correct for aberrations well at such wildly different magnifications. The Bokina did infinity to 1:2, with added optical adaptor to do 1:2-1:1 in order to correct the aberrations at all ranges to a high degree. As to the optical design, it is a double-gauss based designed (like, e.g., the Bokina). I look forward to seeing the results (though with a manufacturer like this, QC is perhaps as big a question as anything). Here's the optical design and the MTF (for 10 and 30 lp/mm), though it does not gives the magnification it is for (still looks very impressive). The question is how does the performace hold up all over its range (as well as how consistant will the QC be).

01-06-2015, 04:26 AM	#27
Trudger1272 Senior Member Join Date: Apr 2013 Location: Los Angeles Photos: Albums Posts: 288	...and when I almost have myself convinced the DA*55 should be my last lens!

01-06-2015, 04:28 AM	#28
jedie Junior Member Join Date: Mar 2011 Location: Germany Posts: 46	I asked through eBay: It hat no A-Contacts...

01-06-2015, 07:41 AM	#29
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	Originally posted by macTak The Pentax 100/4 is 1:2 (half life-size) not 2:1, as I recall. The Dental version came with a set of close-up lenses. When used with the DS9 (yellow ring) it goes to 2x https://hindesite.wordpress.com/articles/smc-pentax-a-dental-macro-1004-0/ Does anybody know how many aperture blades the SMC 100mm f/4 macros have?

01-06-2015, 08:58 AM	#30
wombat2go Veteran Member Join Date: Jan 2010 Location: Michigan Photos: Gallery Posts: 2,207	Originally posted by Not a Number Does anybody know how many aperture blades the SMC 100mm f/4 macros have? 6 curved