Pentax-F* 300 4.5 lens fungus...worth the price or headache?

uttam.hathi · 03-02-2015, 08:00 PM

do lets us know what eventually happens with the lens

transam879 · 03-02-2015, 08:57 PM

Originally posted by uttam.hathi

do lets us know what eventually happens with the lens

Will do. I'll send you a PM since I know you are interested.

uttam.hathi · 03-03-2015, 07:05 PM

tks ntd

uttam.hathi · 03-04-2015, 02:36 AM

this is what i did
https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/262251-pent...sassembly.html
this is what i got it as
https://www.flickr.com/photos/34859797@N07/sets/72157644718884482/

---------- Post added 03-04-2015 at 03:07 PM ----------

a picture clicked
https://www.flickr.com/photos/34859797@N07/sets/72157644731796314/

uttam.hathi · 03-03-2016, 02:44 AM

i bust my front glass it was bad not gone- chipped about 3mm at the edge, looking for a donor or someone who can get me 65mm dia 100mm focal length plano convex lens, edge 4mm, actually its positive meniscus.ut want to try a plano convex glass crown or its variant like BK7/N-BK7, flourite would be grt but at what cost.
any thoughts

rrstuff · 03-03-2016, 09:29 AM - **1 Like**

Originally posted by uttam.hathi

i bust my front glass it was bad not gone- chipped about 3mm at the edge, looking for a donor or someone who can get me 65mm dia 100mm focal length plano convex lens, edge 4mm, actually its positive meniscus.ut want to try a plano convex glass crown or its variant like BK7/N-BK7, flourite would be grt but at what cost.
any thoughts

Thorlabs sells various glass elements, possibly even one that would match. It would probably be quite pricey though.

uttam.hathi · 03-03-2016, 06:52 PM

Originally posted by rrstuff

Thorlabs sells various glass elements, possibly even one that would match. It would probably be quite pricey though.

checking on thorlabs surplus shed chinese manufacturers (they are very pricey) and possibly if it can be done in India

transam879 · 03-13-2016, 12:19 PM - **1 Like**

Anyone that was interested in parts from this lens on that PM'd me from this thread. Just wanted to let you know that I had zero luck with the Post Office and I'm prepared to sell the parts/lens. Not sure what would be the better route to go. I have a lot going on right now and honestly don't know what anything is worth. Lens was sent to dcshooter last year to clean some fungus and re-cement a set of elements until the front element was shattered during return shipping. Still takes sharp photos from f/8 and smaller, despite the shattered front element, but that is not what this lens is meant to shoot at, it's meant to be shot at f4.5 or f/5.6, which creates a loss in saturation, increased flare, etc. due to the shattered element...

uttam.hathi · 04-11-2016, 01:49 AM

how many glass elements are damaged only the front or more than that

---------- Post added 04-11-2016 at 02:20 PM ----------

i got one front lens element done but a bad job down by over 50 USD equivalent

transam879 · 04-12-2016, 01:49 AM

Appears to be just the front element.

**Digitalis** · 04-12-2016, 02:11 AM

...I hope you have enough Advil.

transam879 · 04-12-2016, 06:08 PM

Originally posted by Digitalis

...I hope you have enough Advil.

I ended up getting an awesome deal on a DA 300 f/4. It wouldn't focus and I used a small screwdriver to turn the screwdrive thing on the lens mount a little and it has worked ever since, the SDM works great. Not sure how they are connected, maybe just the focusing in general got stuck or something. But ended up with a fully functional 300 f/4 for $400. That helped reduce the amount of Advil I needed. (And just to be sure, I converted it to screwdrive and back to SDM, just to make sure that option was still available down the road if needed).

uttam.hathi · 04-12-2016, 07:55 PM

thats grt, i like people who restore instead of junking (recycling is a fad word which i avoid)

---------- Post added 04-13-2016 at 08:29 AM ----------

That F* 300: the details f the front glass is 65mm dia 15mm height, 100mm focal length edgeis 4mm positive meniscus lens, plano-convex will not work as the positive of the earlier glass would touch. need to see reverse with plano convex adjusting the focal length as 102 FL with adjustment flange.
look for this in surplus shed shipping would not be an issue to u

transam879 · 04-13-2016, 12:16 AM

Originally posted by uttam.hathi

That F* 300: the details f the front glass is 65mm dia 15mm height, 100mm focal length edgeis 4mm positive meniscus lens, plano-convex will not work as the positive of the earlier glass would touch. need to see reverse with plano convex adjusting the focal length as 102 FL with adjustment flange.
look for this in surplus shed shipping would not be an issue to u

I'm lost on what you are talking about here.

uttam.hathi · 04-14-2016, 06:44 AM

change the front glass

03-03-2016, 02:44 AM	#50
uttam.hathi Veteran Member Join Date: Feb 2009 Photos: Albums Posts: 621	*F300** i bust my front glass it was bad not gone- chipped about 3mm at the edge, looking for a donor or someone who can get me 65mm dia 100mm focal length plano convex lens, edge 4mm, actually its positive meniscus.ut want to try a plano convex glass crown or its variant like BK7/N-BK7, flourite would be grt but at what cost. any thoughts

04-12-2016, 06:08 PM	#57
transam879 Veteran Member Join Date: Feb 2011 Location: Syracuse, NY Posts: 651 Original Poster	Originally posted by Digitalis ...I hope you have enough Advil. I ended up getting an awesome deal on a DA 300 f/4. It wouldn't focus and I used a small screwdriver to turn the screwdrive thing on the lens mount a little and it has worked ever since, the SDM works great. Not sure how they are connected, maybe just the focusing in general got stuck or something. But ended up with a fully functional 300 f/4 for $400. That helped reduce the amount of Advil I needed. (And just to be sure, I converted it to screwdrive and back to SDM, just to make sure that option was still available down the road if needed). Last edited by transam879; 04-12-2016 at 06:30 PM.

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03-02-2015, 08:00 PM	#46
uttam.hathi Veteran Member Join Date: Feb 2009 Photos: Albums Posts: 621	do lets us know what eventually happens with the lens

03-02-2015, 08:57 PM	#47
transam879 Veteran Member Join Date: Feb 2011 Location: Syracuse, NY Posts: 651 Original Poster	Originally posted by uttam.hathi do lets us know what eventually happens with the lens Will do. I'll send you a PM since I know you are interested.

03-03-2015, 07:05 PM	#48
uttam.hathi Veteran Member Join Date: Feb 2009 Photos: Albums Posts: 621	tks ntd

03-04-2015, 02:36 AM	#49
uttam.hathi Veteran Member Join Date: Feb 2009 Photos: Albums Posts: 621	this is what i did https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/262251-pent...sassembly.html this is what i got it as https://www.flickr.com/photos/34859797@N07/sets/72157644718884482/ ---------- Post added 03-04-2015 at 03:07 PM ---------- a picture clicked https://www.flickr.com/photos/34859797@N07/sets/72157644731796314/

03-03-2016, 09:29 AM - 1 Like	#51
rrstuff Veteran Member Join Date: Sep 2013 Location: Pasadena, CA Photos: Albums Posts: 1,126	Originally posted by uttam.hathi i bust my front glass it was bad not gone- chipped about 3mm at the edge, looking for a donor or someone who can get me 65mm dia 100mm focal length plano convex lens, edge 4mm, actually its positive meniscus.ut want to try a plano convex glass crown or its variant like BK7/N-BK7, flourite would be grt but at what cost. any thoughts Thorlabs sells various glass elements, possibly even one that would match. It would probably be quite pricey though.

03-03-2016, 06:52 PM	#52
uttam.hathi Veteran Member Join Date: Feb 2009 Photos: Albums Posts: 621	Originally posted by rrstuff Thorlabs sells various glass elements, possibly even one that would match. It would probably be quite pricey though. checking on thorlabs surplus shed chinese manufacturers (they are very pricey) and possibly if it can be done in India

03-13-2016, 12:19 PM - 1 Like	#53
transam879 Veteran Member Join Date: Feb 2011 Location: Syracuse, NY Posts: 651 Original Poster	Anyone that was interested in parts from this lens on that PM'd me from this thread. Just wanted to let you know that I had zero luck with the Post Office and I'm prepared to sell the parts/lens. Not sure what would be the better route to go. I have a lot going on right now and honestly don't know what anything is worth. Lens was sent to dcshooter last year to clean some fungus and re-cement a set of elements until the front element was shattered during return shipping. Still takes sharp photos from f/8 and smaller, despite the shattered front element, but that is not what this lens is meant to shoot at, it's meant to be shot at f4.5 or f/5.6, which creates a loss in saturation, increased flare, etc. due to the shattered element...

04-11-2016, 01:49 AM	#54
uttam.hathi Veteran Member Join Date: Feb 2009 Photos: Albums Posts: 621	how many glass elements are damaged only the front or more than that ---------- Post added 04-11-2016 at 02:20 PM ---------- i got one front lens element done but a bad job down by over 50 USD equivalent

04-12-2016, 01:49 AM	#55
transam879 Veteran Member Join Date: Feb 2011 Location: Syracuse, NY Posts: 651 Original Poster	Appears to be just the front element.

04-12-2016, 02:11 AM	#56
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,694	...I hope you have enough Advil.

04-12-2016, 07:55 PM	#58
uttam.hathi Veteran Member Join Date: Feb 2009 Photos: Albums Posts: 621	thats grt, i like people who restore instead of junking (recycling is a fad word which i avoid) ---------- Post added 04-13-2016 at 08:29 AM ---------- That F* 300: the details f the front glass is 65mm dia 15mm height, 100mm focal length edgeis 4mm positive meniscus lens, plano-convex will not work as the positive of the earlier glass would touch. need to see reverse with plano convex adjusting the focal length as 102 FL with adjustment flange. look for this in surplus shed shipping would not be an issue to u

04-13-2016, 12:16 AM	#59
transam879 Veteran Member Join Date: Feb 2011 Location: Syracuse, NY Posts: 651 Original Poster	Originally posted by uttam.hathi That F* 300: the details f the front glass is 65mm dia 15mm height, 100mm focal length edgeis 4mm positive meniscus lens, plano-convex will not work as the positive of the earlier glass would touch. need to see reverse with plano convex adjusting the focal length as 102 FL with adjustment flange. look for this in surplus shed shipping would not be an issue to u I'm lost on what you are talking about here.

04-14-2016, 06:44 AM	#60
uttam.hathi Veteran Member Join Date: Feb 2009 Photos: Albums Posts: 621	change the front glass