Redcat 250mm f/4.9 - maybe

reh321 · 02-09-2019, 02:23 PM

Originally posted by alcstudios

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"

OK, I understand now, and regrettably I agree with you.

reh321 · 02-09-2019, 02:41 PM - **1 Like**

Originally posted by rawr

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.

From the previews I'm finding on-line, this lens is basically where telescopes and telephoto lenses 'meet'.
William Optics RedCat 51 Petzval APO (First Look) | AstroBackyard
I'm not sure how telescopes handle ghosting, flare control, and CA, but this will provide whatever telescopes usually get.

The official Williams page uses the word "T-mount" to describe the mount provided.
RedCat 51 APO - William Optics

**mwilky55** · 02-09-2019, 04:38 PM

Originally posted by tvdtvdtvd

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

Cromulent?! That’s sending me to the dictionary 😎

VoiceOfReason · 02-10-2019, 06:13 PM

Yeah, this is simply a short telescope by Williams Optics and you would use a normal T mount adapter on it. Why is there a kickstarter for it anyway? I've been following development of it because I do more astrophotography than anythign now.

reh321 · 02-10-2019, 06:21 PM

Originally posted by VoiceOfReason

Yeah, this is simply a short telescope by Williams Optics and you would use a normal T mount adapter on it.

Which leaves me wondering why he is developing special "mounts" for it, as indicated in message #9 above.

ZombieArmy · 02-10-2019, 07:48 PM

The cat is pretty cute!

**bobbotron** · 02-11-2019, 05:55 AM

I love the anodizing! So this is fixed aperture?

**bobbotron** · 02-11-2019, 02:12 PM

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.

Man, the promo video for it has tooo many fast transitions. Just because you could, doesn't mean you should!

Mistral75 · 02-17-2019, 03:21 PM

Ultra Versatile Telephoto Lens, Redcat 250mm f/4.9 by James Yang — Camera Mounting Options — Kickstarter

**SteveinSLC** · 02-17-2019, 04:28 PM

I've bought things from Williams before, and they are a solid company. That said, there's probably better options than this already available in Pentax lenses for less money. If you can find the Tak 200 F3.5 in good condition for instance.
The one thing a good telescope design does give you is usually an option for much more fine focus control than is typically possible with the barrel focusers on lenses..

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02-09-2019, 02:23 PM	#16
reh321 Pentaxian Join Date: Nov 2014 Location: South Bend, IN, USA Photos: Gallery \| Albums Posts: 23,179	Originally posted by alcstudios 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" OK, I understand now, and regrettably I agree with you.

02-09-2019, 02:41 PM - 1 Like	#17
reh321 Pentaxian Join Date: Nov 2014 Location: South Bend, IN, USA Photos: Gallery \| Albums Posts: 23,179	Originally posted by rawr 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. From the previews I'm finding on-line, this lens is basically where telescopes and telephoto lenses 'meet'. William Optics RedCat 51 Petzval APO (First Look) \| AstroBackyard I'm not sure how telescopes handle ghosting, flare control, and CA, but this will provide whatever telescopes usually get. The official Williams page uses the word "T-mount" to describe the mount provided. RedCat 51 APO - William Optics

02-09-2019, 04:38 PM	#18
mwilky55 Site Supporter Join Date: Feb 2012 Location: Southeastern Connecticut Photos: Albums Posts: 816	Originally posted by tvdtvdtvd Ideation! Without question the most cromulent word I've read in a very long time. Cromulent?! That’s sending me to the dictionary 😎

02-10-2019, 06:13 PM	#19
VoiceOfReason Site Supporter Join Date: Jun 2010 Location: Mishawaka IN area Photos: Albums Posts: 6,124	Yeah, this is simply a short telescope by Williams Optics and you would use a normal T mount adapter on it. Why is there a kickstarter for it anyway? I've been following development of it because I do more astrophotography than anythign now.

02-10-2019, 06:21 PM	#20
reh321 Pentaxian Join Date: Nov 2014 Location: South Bend, IN, USA Photos: Gallery \| Albums Posts: 23,179	Originally posted by VoiceOfReason Yeah, this is simply a short telescope by Williams Optics and you would use a normal T mount adapter on it. Which leaves me wondering why he is developing special "mounts" for it, as indicated in message #9 above.

02-10-2019, 07:48 PM	#21
ZombieArmy Pentaxian Join Date: Jun 2014 Location: Florida Posts: 3,210	The cat is pretty cute!

02-11-2019, 05:55 AM	#22
bobbotron Site Supporter Join Date: Jan 2015 Location: Ottawa, ON Photos: Gallery Posts: 3,349	I love the anodizing! So this is fixed aperture?

02-11-2019, 02:12 PM	#23
bobbotron Site Supporter Join Date: Jan 2015 Location: Ottawa, ON Photos: Gallery Posts: 3,349	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. Man, the promo video for it has tooo many fast transitions. Just because you could, doesn't mean you should!

02-17-2019, 03:21 PM	#24
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	Ultra Versatile Telephoto Lens, Redcat 250mm f/4.9 by James Yang — Camera Mounting Options — Kickstarter

02-17-2019, 04:28 PM	#25
SteveinSLC Site Supporter Join Date: Mar 2017 Photos: Gallery \| Albums Posts: 568	I've bought things from Williams before, and they are a solid company. That said, there's probably better options than this already available in Pentax lenses for less money. If you can find the Tak 200 F3.5 in good condition for instance. The one thing a good telescope design does give you is usually an option for much more fine focus control than is typically possible with the barrel focusers on lenses..