Great Lens Cap for 40mm Limited

Stratario · 10-17-2009, 05:56 PM

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Originally posted by GerryL

Soldbear, with the step-down rings, won't the photos vignette?
Won't it cause some sort of a tunnel vision effect?

I've tried the 30.5 mm step down ring on 28mm and 35mm lens and it did not vignette. With a 24mm lens it did. I think it should be alright with 50mm and longer lenses as well.

SOldBear · 10-17-2009, 11:40 PM

Originally posted by GerryL

Soldbear, with the step-down rings, won't the photos vignette?
Won't it cause some sort of a tunnel vision effect?

Some lenses do, some don't.

I set the camera in Av mode and open the lens to full aperture, then I add step down rings until I see a drop in shutter speed, then I back up one step.

For this Vivitar 135mm close focusing (62mm filter thread diameter), for example, I have to stop at 49mm, then I add a Pentax 49mm lens hood. It's still more compact than a 62mm lens hood.

I found out that this kind of "lens hood" doesn't work well with zoom lenses.

Fixcinater · 10-18-2009, 12:20 AM

Have you done any A/B testing with the step-down and small hood versus extending the "correct" hood?

Probably lens-specific results, but would be interesting nonetheless.

HarryGB · 10-18-2009, 02:21 AM

Originally posted by erikmichael

I just purchased these off e-Bay. I am NOT the seller... just wanting to share a great find. Comes in a pack of 3 and fit my new 40mm very well. Super fast on and off. Looks great too. I love the feel of the original screw metal cap, but this is much more practical.

Thanks for this. Better than the £26 (GB pounds) I was quoted from Pentax for a genuine replacement!!!!! It has since turned up under a cupboard.

regards

Harry

legacyb4 · 10-28-2009, 01:42 PM

Got my set of 3 caps today; fit perfectly on the DA 40mm and looks like it came with the camera.

benjikan · 01-30-2010, 01:39 PM

Originally posted by erikmichael

I just purchased these off e-Bay. I am NOT the seller... just wanting to share a great find. Comes in a pack of 3 and fit my new 40mm very well. Super fast on and off. Looks great too. I love the feel of the original screw metal cap, but this is much more practical.

3 Front Lens Cap 30mm Caps that Clip On - eBay (item 350236959614 end time Nov-04-09 13:25:00 PST)

or search for: 3 Front Lens Cap 30mm Caps that Clip On

Also - Some first photos with my 40mm... shot in low light at dusk mostly 400 ISO and some 800 ISO.

Picasa Web Albums - Erik - 40mm Limited ...

Just ordered the caps for my 40 Ltd. What can i do with the other 2???

10-17-2009, 11:40 PM	#17
SOldBear Veteran Member Join Date: Feb 2009 Location: Alameda, CA Posts: 3,206	Originally posted by GerryL Soldbear, with the step-down rings, won't the photos vignette? Won't it cause some sort of a tunnel vision effect? Some lenses do, some don't. I set the camera in Av mode and open the lens to full aperture, then I add step down rings until I see a drop in shutter speed, then I back up one step. For this Vivitar 135mm close focusing (62mm filter thread diameter), for example, I have to stop at 49mm, then I add a Pentax 49mm lens hood. It's still more compact than a 62mm lens hood. I found out that this kind of "lens hood" doesn't work well with zoom lenses. Last edited by SOldBear; 10-18-2009 at 12:30 AM.

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10-17-2009, 05:56 PM	#16
Stratario Veteran Member Join Date: Mar 2008 Location: Ontario, Canada Photos: Gallery Posts: 366	Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here. Originally posted by GerryL Soldbear, with the step-down rings, won't the photos vignette? Won't it cause some sort of a tunnel vision effect? I've tried the 30.5 mm step down ring on 28mm and 35mm lens and it did not vignette. With a 24mm lens it did. I think it should be alright with 50mm and longer lenses as well.

10-18-2009, 12:20 AM	#18
Fixcinater Veteran Member Join Date: Jun 2009 Location: San Diego, CA, USA Posts: 409	Have you done any A/B testing with the step-down and small hood versus extending the "correct" hood? Probably lens-specific results, but would be interesting nonetheless.

10-18-2009, 02:21 AM	#19
HarryGB Guest	Originally posted by erikmichael I just purchased these off e-Bay. I am NOT the seller... just wanting to share a great find. Comes in a pack of 3 and fit my new 40mm very well. Super fast on and off. Looks great too. I love the feel of the original screw metal cap, but this is much more practical. Thanks for this. Better than the £26 (GB pounds) I was quoted from Pentax for a genuine replacement!!!!! It has since turned up under a cupboard. regards Harry

10-28-2009, 01:42 PM	#20
legacyb4 Inactive Account Join Date: Sep 2008 Location: Tri-Cities, British Columbia Photos: Gallery Posts: 1,784	Got my set of 3 caps today; fit perfectly on the DA 40mm and looks like it came with the camera.

01-30-2010, 01:39 PM	#21
benjikan Veteran Member Join Date: Jan 2007 Location: Paris, France Photos: Gallery Posts: 4,308	Originally posted by erikmichael I just purchased these off e-Bay. I am NOT the seller... just wanting to share a great find. Comes in a pack of 3 and fit my new 40mm very well. Super fast on and off. Looks great too. I love the feel of the original screw metal cap, but this is much more practical. 3 Front Lens Cap 30mm Caps that Clip On - eBay (item 350236959614 end time Nov-04-09 13:25:00 PST) or search for: 3 Front Lens Cap 30mm Caps that Clip On Also - Some first photos with my 40mm... shot in low light at dusk mostly 400 ISO and some 800 ISO. Picasa Web Albums - Erik - 40mm Limited ... Just ordered the caps for my 40 Ltd. What can i do with the other 2???

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