Redcat 250mm f/4.9 - maybe

beholder3 · 02-09-2019, 03:03 AM

There is another manual kickstarter lens (price level around $700):

Ultra Versatile Telephoto Lens, Redcat 250mm f/4.9 by James Yang ? Kickstarter

On the images it says Pentax mounts, bot nowhere else. I would assume the just add an adapter ring.

RonHendriks1966 · 02-09-2019, 04:06 AM - **2 Likes**

Kickstarter is for People Who like to gamble.

biz-engineer · 02-09-2019, 04:15 AM - **1 Like**

Originally posted by RonHendriks1966

Kickstarter is for People Who like to gamble.

In life, if you don't play you don't lose , but then you are guaranteed not to win.

tvdtvdtvd · 02-09-2019, 04:18 AM - **1 Like**

Ideation! Without question the most cromulent word I've read in a very long time.

zapp · 02-09-2019, 04:26 AM - **4 Likes**

Get a used 4/300 for the same price and be happy.

Mistral75 · 02-09-2019, 05:24 AM

Originally posted by beholder3

(...)

On the images it says Pentax mounts, bot nowhere else. I would assume the just add an adapter ring.

Yes they do. The lens itself (a very simple design, 4 elements in 3 groups) has an M48 thread mount and a long flange back distance, allowing the addition of an M48 to SLR mount end part.

**WPRESTO** · 02-09-2019, 05:27 AM - **2 Likes**

Williams Optics SFAIK has made primarily small specialty refracting telescopes for astronomy, such as instruments to look at the sun. Astronomical refractors generally have much simpler optical systems than photographic telephoto lenses = typically apochromatic doublet or triplet designs that are diffraction-limited for resolution. Williams is no come-lately or slouch for making very high quality instruments of this type.

gavinhw · 02-09-2019, 08:50 AM

Originally posted by beholder3

There is another manual kickstarter lens (price level around $700):

Ultra Versatile Telephoto Lens, Redcat 250mm f/4.9 by James Yang ? Kickstarter

On the images it says Pentax mounts, bot nowhere else. I would assume the just add an adapter ring.

William Optics has been around for a while. A respected company. I have bought from them before. Thanks for the heads up. The Petzval design results in a flat field.

reh321 · 02-09-2019, 10:22 AM

Originally posted by beholder3

There is another manual kickstarter lens (price level around $700):

Ultra Versatile Telephoto Lens, Redcat 250mm f/4.9 by James Yang ? Kickstarter

On the images it says Pentax mounts, bot nowhere else. I would assume the just add an adapter ring.

Under the "comments" tab, someone asked this question and got a response

Originally posted by James Yang, creator:

I am currently working on the Design of Pentax, M4/3 and Sony E mount, all of these mounts will be manufactured before the project funding is complete, so all our backers will be able to get the package on time. Also, the camera mounts can be purchased from our website directly after production, which gives the users the option to use a different camera with the lens.

Conceptually, this is similar to Tamron's AdaptAll system. I'm having trouble getting interested in a 250mm prime lens right now, and a $600 investment saves me only 10% retail price if I decide later I want one. It would certainly stand out, though.

**WPRESTO** · 02-09-2019, 10:56 AM - **1 Like**

Also keep in mind: 1) manual focus; 2) fixed aperture (f4.9 and be there)

alcstudios · 02-09-2019, 11:46 AM - **1 Like**

It says there are currently working on the Pentax design, This could be Ricoh

reh321 · 02-09-2019, 11:57 AM

Originally posted by alcstudios

It says there are currently working on the Pentax design, This could be Ricoh

I am quite certain the "Pentax mount" referenced in #9 above is K-mount.
Redcat 250mm f/4.9 - maybe - PentaxForums.com

ne! · 02-09-2019, 12:14 PM

Originally posted by zapp

Get a used 4/300 for the same price and be happy.

My thinking as well, and I might even suggest the auto-focus, variable aperture (!) DA*200/2.8 for around $500 second-hand and cropping a little.

rawr · 02-09-2019, 01:09 PM

I worry about ghosting, flare control and CA as much as MTF and distortion. Didn't see much info in the Kickstarter page on how well those problems are addressed.

alcstudios · 02-09-2019, 01:43 PM - **2 Likes**

Originally posted by reh321

I am quite certain the "Pentax mount" referenced in #9 above is K-mount.
Redcat 250mm f/4.9 - maybe - PentaxForums.com

The reference was to the Ricoh motto "currently working on it" sounds like a Ricoh rep does it not? The standard answers are....

Currently working on it

and

Under heavy development

I can imagine this lens will be Pentax ready before the next Ricoh/Pentax announcement cause these people are producing a product and Ricoh/Pentax is "watching the market"

02-09-2019, 03:03 AM	#1
beholder3 Pentaxian Join Date: Dec 2011 Posts: 3,112	Redcat 250mm f/4.9 - maybe There is another manual kickstarter lens (price level around $700): Ultra Versatile Telephoto Lens, Redcat 250mm f/4.9 by James Yang ? Kickstarter On the images it says Pentax mounts, bot nowhere else. I would assume the just add an adapter ring.

02-09-2019, 05:24 AM	#6
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	Originally posted by beholder3 (...) On the images it says Pentax mounts, bot nowhere else. I would assume the just add an adapter ring. Yes they do. The lens itself (a very simple design, 4 elements in 3 groups) has an M48 thread mount and a long flange back distance, allowing the addition of an M48 to SLR mount end part. Last edited by Mistral75; 02-09-2019 at 06:23 AM.

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02-09-2019, 04:06 AM - 2 Likes	#2
RonHendriks1966 Banned Join Date: Jan 2009 Photos: Gallery Posts: 9,675	Kickstarter is for People Who like to gamble.

02-09-2019, 04:15 AM - 1 Like	#3
biz-engineer Pentaxian Join Date: Feb 2015 Photos: Gallery Posts: 12,242	Originally posted by RonHendriks1966 Kickstarter is for People Who like to gamble. In life, if you don't play you don't lose , but then you are guaranteed not to win.

02-09-2019, 04:18 AM - 1 Like	#4
tvdtvdtvd Veteran Member Join Date: Jan 2010 Posts: 1,665	Ideation! Without question the most cromulent word I've read in a very long time.

02-09-2019, 04:26 AM - 4 Likes	#5
zapp Pentaxian Join Date: Jul 2011 Posts: 2,388	Get a used 4/300 for the same price and be happy.

02-09-2019, 05:27 AM - 2 Likes	#7
WPRESTO Loyal Site Supporter Join Date: Aug 2010 Location: Massachusetts Photos: Gallery \| Albums Posts: 59,138	Williams Optics SFAIK has made primarily small specialty refracting telescopes for astronomy, such as instruments to look at the sun. Astronomical refractors generally have much simpler optical systems than photographic telephoto lenses = typically apochromatic doublet or triplet designs that are diffraction-limited for resolution. Williams is no come-lately or slouch for making very high quality instruments of this type.

02-09-2019, 08:50 AM	#8
gavinhw Senior Member Join Date: Oct 2007 Posts: 145	Originally posted by beholder3 There is another manual kickstarter lens (price level around $700): Ultra Versatile Telephoto Lens, Redcat 250mm f/4.9 by James Yang ? Kickstarter On the images it says Pentax mounts, bot nowhere else. I would assume the just add an adapter ring. William Optics has been around for a while. A respected company. I have bought from them before. Thanks for the heads up. The Petzval design results in a flat field.

02-09-2019, 10:22 AM	#9
reh321 Pentaxian Join Date: Nov 2014 Location: South Bend, IN, USA Photos: Gallery \| Albums Posts: 23,184	Originally posted by beholder3 There is another manual kickstarter lens (price level around $700): Ultra Versatile Telephoto Lens, Redcat 250mm f/4.9 by James Yang ? Kickstarter On the images it says Pentax mounts, bot nowhere else. I would assume the just add an adapter ring. Under the "comments" tab, someone asked this question and got a response Originally posted by James Yang, creator: I am currently working on the Design of Pentax, M4/3 and Sony E mount, all of these mounts will be manufactured before the project funding is complete, so all our backers will be able to get the package on time. Also, the camera mounts can be purchased from our website directly after production, which gives the users the option to use a different camera with the lens. Conceptually, this is similar to Tamron's AdaptAll system. I'm having trouble getting interested in a 250mm prime lens right now, and a $600 investment saves me only 10% retail price if I decide later I want one. It would certainly stand out, though.

02-09-2019, 10:56 AM - 1 Like	#10
WPRESTO Loyal Site Supporter Join Date: Aug 2010 Location: Massachusetts Photos: Gallery \| Albums Posts: 59,138	Also keep in mind: 1) manual focus; 2) fixed aperture (f4.9 and be there)

02-09-2019, 11:46 AM - 1 Like	#11
alcstudios Senior Member Join Date: Sep 2011 Location: Texas Photos: Albums Posts: 146	It says there are currently working on the Pentax design, This could be Ricoh

02-09-2019, 11:57 AM	#12
reh321 Pentaxian Join Date: Nov 2014 Location: South Bend, IN, USA Photos: Gallery \| Albums Posts: 23,184	Originally posted by alcstudios It says there are currently working on the Pentax design, This could be Ricoh I am quite certain the "Pentax mount" referenced in #9 above is K-mount. Redcat 250mm f/4.9 - maybe - PentaxForums.com

02-09-2019, 12:14 PM	#13
ne! Forum Member Join Date: Dec 2016 Posts: 57	Originally posted by zapp Get a used 4/300 for the same price and be happy. My thinking as well, and I might even suggest the auto-focus, variable aperture (!) DA*200/2.8 for around $500 second-hand and cropping a little.

02-09-2019, 01:09 PM	#14
rawr Veteran Member Join Date: Jun 2009 Posts: 11,913	I worry about ghosting, flare control and CA as much as MTF and distortion. Didn't see much info in the Kickstarter page on how well those problems are addressed.

02-09-2019, 01:43 PM - 2 Likes	#15
alcstudios Senior Member Join Date: Sep 2011 Location: Texas Photos: Albums Posts: 146	Originally posted by reh321 I am quite certain the "Pentax mount" referenced in #9 above is K-mount. Redcat 250mm f/4.9 - maybe - PentaxForums.com The reference was to the Ricoh motto "currently working on it" sounds like a Ricoh rep does it not? The standard answers are.... Currently working on it and Under heavy development I can imagine this lens will be Pentax ready before the next Ricoh/Pentax announcement cause these people are producing a product and Ricoh/Pentax is "watching the market"