FA* 300mm f/4.5 lens hood replacement

**Ash** · 04-05-2021, 03:31 AM

Originally posted by Qman

I'm assuming the original hood is plastic. If it's metal it may not be possible to make a functional 3D printed one.

It’s plastic, with a rubber end, but the lugs have some sort of clips that keep them in place against the body attachments. Hard to print that.

Qman · 04-07-2021, 08:32 AM

Can you post a close-up picture of the lugs?

**i_trax** · 04-07-2021, 10:47 AM - **1 Like**

the "mounting" ring with 3x lugs is remove-able.
quick photos with MX-1

angerdan · 12-23-2022, 09:34 AM

More informations about the two different hood connections (3pin / 4pin) are in this thread:
Pentax FA* 300mm f/4.5 hood info request - PentaxForums.com

**GeeEmm** · 11-28-2023, 06:04 AM

Resurrecting this thread, as a new owner of one of these without a hood - 3007172, three lug mounting.

I perked up on the mention of 3D printing, but the complexities of replicating the factory attachment seem to condemn that option.

My thinking first went to a replacement front ring on the lens itself, but this would require some detailed CAD work and precision CNC milling. Possible, but difficult/expensive.

Third time lucky? I am thinking about how the screw-on filters could be employed, perhaps as sacrificial elements - ie lose the glass filter and use the filter mount as the attachment point for a hood. Unless a specific quick-release system could be devised, the hood would be attached (glued? clamped? other?) to the outside of the filter ring and removed like a filter by unscrewing the assembly. More cumbersome that what we are used to, but when all else fails ...

A variant could be simply a slotted end on a custom or modified lens hood, secured by a clamp of some sort. It could be reversible to store on the lens barrel perhaps. Not pretty, but practical, and cheap.

Thoughts?

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04-05-2021, 03:31 AM	#16
Ash Loyal Site Supporter Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 23,920 Original Poster	Originally posted by Qman I'm assuming the original hood is plastic. If it's metal it may not be possible to make a functional 3D printed one. It’s plastic, with a rubber end, but the lugs have some sort of clips that keep them in place against the body attachments. Hard to print that.

04-07-2021, 08:32 AM	#17
Qman Senior Member Join Date: Jun 2017 Posts: 232	Can you post a close-up picture of the lugs?

12-23-2022, 09:34 AM	#19
angerdan Pentaxian Join Date: Feb 2015 Photos: Gallery \| Albums Posts: 2,639	More informations about the two different hood connections (3pin / 4pin) are in this thread: Pentax FA* 300mm f/4.5 hood info request - PentaxForums.com

11-28-2023, 06:04 AM	#20
GeeEmm Site Supporter Join Date: May 2010 Location: Canberra Posts: 232	Resurrecting this thread, as a new owner of one of these without a hood - 3007172, three lug mounting. I perked up on the mention of 3D printing, but the complexities of replicating the factory attachment seem to condemn that option. My thinking first went to a replacement front ring on the lens itself, but this would require some detailed CAD work and precision CNC milling. Possible, but difficult/expensive. Third time lucky? I am thinking about how the screw-on filters could be employed, perhaps as sacrificial elements - ie lose the glass filter and use the filter mount as the attachment point for a hood. Unless a specific quick-release system could be devised, the hood would be attached (glued? clamped? other?) to the outside of the filter ring and removed like a filter by unscrewing the assembly. More cumbersome that what we are used to, but when all else fails ... A variant could be simply a slotted end on a custom or modified lens hood, secured by a clamp of some sort. It could be reversible to store on the lens barrel perhaps. Not pretty, but practical, and cheap. Thoughts?