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Heming · 05-14-2008, 01:14 AM

New to DSLR, has just bought a K20D, and quite pleased. However, I have difficulties trying to use my 85mm soft of which i am quite fond.
Help would be greatly appreciated!

pschlute · 05-14-2008, 02:06 AM

Originally posted by Heming

New to DSLR, has just bought a K20D, and quite pleased. However, I have difficulties trying to use my 85mm soft of which i am quite fond.
Help would be greatly appreciated!

Which 85 soft? and what problems ?

Heming · 05-14-2008, 04:03 AM

The lens is a Pentax F soft focus lens. The focus is softer the larger the aperture. So you have to do the aperture manually. The camera simply doesnt work when i try to do this.

joefru · 05-14-2008, 04:53 AM

There's a custom function to allow the use of manual-aperture lenses. Not sure why this is disabled by default.

pschlute · 05-14-2008, 05:51 AM

Originally posted by joefru

There's a custom function to allow the use of manual-aperture lenses. Not sure why this is disabled by default.

Yes , this is true (I agree it should be "allowed" by default)

I have the K10, but I think the functionality should be the same. I have the "K" 85 soft, and as this lens operates only in "stop-down" mode I can use Av or Manual exposure mode.

I understand from Boj's page the F 85mm soft has a partial stop down /partial auto diaphram. This suggests you can use it in Av and Manual mode from 2.8-5.6and only in Manual mode from 5.6-22.

You will have to experiment and let us know.

05-14-2008, 01:14 AM	#1
Heming Inactive Account Join Date: Apr 2008 Location: Norway Posts: 3	K20D and 85mm soft New to DSLR, has just bought a K20D, and quite pleased. However, I have difficulties trying to use my 85mm soft of which i am quite fond. Help would be greatly appreciated!

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05-14-2008, 02:06 AM	#2
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,218	Originally posted by Heming New to DSLR, has just bought a K20D, and quite pleased. However, I have difficulties trying to use my 85mm soft of which i am quite fond. Help would be greatly appreciated! Which 85 soft? and what problems ?

05-14-2008, 04:03 AM	#3
Heming Inactive Account Join Date: Apr 2008 Location: Norway Posts: 3 Original Poster	The lens is a Pentax F soft focus lens. The focus is softer the larger the aperture. So you have to do the aperture manually. The camera simply doesnt work when i try to do this.

05-14-2008, 04:53 AM	#4
joefru Senior Member Join Date: Mar 2008 Location: South Louisiana Photos: Gallery Posts: 210	There's a custom function to allow the use of manual-aperture lenses. Not sure why this is disabled by default.

05-14-2008, 05:51 AM	#5
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,218	Originally posted by joefru There's a custom function to allow the use of manual-aperture lenses. Not sure why this is disabled by default. Yes , this is true (I agree it should be "allowed" by default) I have the K10, but I think the functionality should be the same. I have the "K" 85 soft, and as this lens operates only in "stop-down" mode I can use Av or Manual exposure mode. I understand from Boj's page the F 85mm soft has a partial stop down /partial auto diaphram. This suggests you can use it in Av and Manual mode from 2.8-5.6and only in Manual mode from 5.6-22. You will have to experiment and let us know.

K20D and 85mm soft

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