K10D lens Manual or auto?

coopec · 03-24-2021, 05:47 PM

This is my first post on this forum so I'm feeling my way.

I loved my Asahi Pentax film camera when I was traveling but when I went digital I switched to Canon. When the Canon broke down I thought I'd go back to Pentax (but without spending too much money)

I bought a K10D (body only) and had planned to use the old Asahi Pentax lenses with an adapter. However I then decided to buy a Sigma 18-50mm lens and through a couple of deals on eBay I am now a proud owner of:

K10D
K100D
Sigma 18-50mm (Manual)
Sigma 18-50mm (Auto

I plan to use the K10D but I'm not too sure whether I should retain the manual or auto lens. Apparently professionals would use the manual (I am not a professional!) as auto lenses are not good in low light conditions.

Should I keep the manual or auto lens and give the other lens (plus K100D) to my son?

Thanks in advance

MarkJerling · 03-24-2021, 05:57 PM

Welcome to the forum! There are a number of different Sigma 18-50mm lenses so it's not clear from your post which models you have. Some get better reviews than other.
When you say "Auto", do you mean autofocus (AF), or do you mean a manual lens with an A (auto) setting for the aperture ring?

Gifting the one body and lens to your son seems like a good idea if your son is also interested in photography. I gave my K5 and some lenses to my daughter.

MarkJerling · 03-24-2021, 05:59 PM - **1 Like**

Here's some different Sigma 18-50mm lenses:

Sigma 18-50mm F2.8 DC EX Lens Reviews - Sigma Lenses - Pentax Lens Review Database
Sigma 18-50mm F2.8 EX DC Macro Lens Reviews - Sigma Lenses - Pentax Lens Review Database
Sigma 18-50mm F2.8-4.5 DC OS HSM Lens Reviews - Sigma Lenses - Pentax Lens Review Database
Sigma 18-50mm F3.5-5.6 DC Lens Reviews - Sigma Lenses - Pentax Lens Review Database

**aslyfox** · 03-24-2021, 06:00 PM

welcome to the forums

you will find friendly members and a lot of knowledge here

this chart can be used to show how lenses work with your K 10D and K 100D

Quote:

Pentax K-mount Lens Compatibility Chart
Copyright 2006-2020 Mosphotos.com. All rights reserved.

The Pentax K-mount Camera Lens Compatibility Chart

you may be able to find your lenses:

Sigma 18-50mm (Manual)
Sigma 18-50mm (Auto)

by looking for them here:

Sigma Lenses - Pentax Lens Review Database

look for information about your K 10d and K 100D here:

Pentax K10D - Pentax K-mount DSLRs - Pentax Camera Reviews and Specifications

Pentax K100D - Pentax K-mount DSLRs - Pentax Camera Reviews and Specifications

**jatrax** · 03-24-2021, 06:14 PM

Originally posted by coopec

Apparently professionals would use the manual (I am not a professional!) as auto lenses are not good in low light conditions.

It's not quite clear what you mean by 'auto' or 'manual' but I don't think are many (if any) professionals using a manual lens these days. I suppose 30 years ago a manual lens might be used by a pro with 'auto' reserved for those mere mortals who needed the help. However, these days nearly all modern lenses are completely "auto".

Not a Number · 03-24-2021, 06:26 PM

What model was you old Pentax film camera? You shouldn't need an adapter unless it was screwmount. What lenses do you have from your film system?

builttospill · 03-24-2021, 06:26 PM

I'd suggest taking few photos in different locations with each lens and keep the one giving you the best results. You'll notice fairly quickly which ones you like the best and they'll be your favorites in a collection of lenses.

Welcome to the forum. I love the K10D and still occasionally use mine bought new so many years ago.

**UncleVanya** · 03-24-2021, 09:20 PM

What is the aperture of each lens?

coopec · 03-24-2021, 09:31 PM

Originally posted by Not a Number

What model was you old Pentax film camera? You shouldn't need an adapter unless it was screwmount. What lenses do you have from your film system?

Yes it was a screw mount It was bought in Suva in1973. I think they may call it M42?

---------- Post added 03-24-21 at 10:08 PM ----------

Originally posted by MarkJerling

Welcome to the forum! There are a number of different Sigma 18-50mm lenses so it's not clear from your post which models you have. Some get better reviews than other.
When you say "Auto", do you mean autofocus (AF), or do you mean a manual lens with an A (auto) setting for the aperture ring?

Gifting the one body and lens to your son seems like a good idea if your son is also interested in photography. I gave my K5 and some lenses to my daughter.

I meant Auto focus.

I'm sorry. Looking at the 18-50mm lenses again they are exactly the same

SIGMA ZOOM 18-50mm 1:3.5-5.6 DC Ø58 Lens made in Japan

SIGMA ZOOM 18-50mm 1:3.5-5.6 DC Ø58 Lens made in Japan

I bought a third lenswhich is auto zoom.

Tristar Auto Zoom MC 1:3.8 f=75~150mm No.818592 49Ø

By turning the body of the lens it zooms in and out but it is auto zoom? Maybe both?

I've done lots of googles on "Tristar" and as far as I can make out they only made filters. (I only paid $10 plus postage for the lens so I suppose I can't expect too much)

Thank you for all the links: I've got a lot of reading to do. I am finding the YouTube tutorials a big help (I've just have to find time)

coopec · 03-24-2021, 11:33 PM

Originally posted by builttospill

I'd suggest taking few photos in different locations with each lens and keep the one giving you the best results. You'll notice fairly quickly which ones you like the best and they'll be your favorites in a collection of lenses.

Welcome to the forum. I love the K10D and still occasionally use mine bought new so many years ago.

Good thinking. I'll take a few shots this afternoon and as the sun is setting. The good part about digital is that I can experiment without it costing.

Having looked at a YouTube tutorial I figure that since I am taking run-of-the-mill photos of a yacht I am building a lot of the settings are irrelevant. But once the yacht is in the water I would want to know how to drive the Pentax..

Well I just took one of the yacht and it didn't work? Mmmmm? But the second one did work. (That's Lancelin Island in the background). This evening I'll try to work out what I did wrong

35mmfilmfan · 03-25-2021, 02:26 AM

Can you be more specific when you say 'it didn't work', please ? Was it exposure, focus, depth of field, camera shake or some other factor ?

coopec · 03-25-2021, 03:59 AM

Originally posted by 35mmfilmfan

Can you be more specific when you say 'it didn't work', please ? Was it exposure, focus, depth of field, camera shake or some other factor ?

There is no record of it on the SD Card although when I pressed the button I saw a "flash". I really don't know why "it didn't work". I took both photos with exactly the same settings. But not to worry, I'm working like a one armed wall-paper hanger right now so I haven't had a chance to look at the YouTube tutorials.

That photo I took with the island in the background looks a little yellow. Are there some filters I should have in my "kit"?

Thanks you for your help.

**aslyfox** · 03-25-2021, 04:38 AM

my recommendation

add to your reading list

the manuals

http://www.ricoh-imaging.co.jp/english/support/man-pdf/k100d.pdf

http://www.ricoh-imaging.co.jp/english/support/man-pdf/k10d.pdf

and move them to the top of the list

coopec · 03-25-2021, 05:03 AM

No doubt a good move to read the manual first but a much as I'd like to become an expert photographer I have lot more pressing needs right now. (Trying to get a yacht into the water).

You guys have been a big help. Now it is over to me to watch the YouTube tutorials to get a basic understanding.

35mmfilmfan · 03-25-2021, 05:24 AM

All the parameters you set should be available in the EXIF data, but what I mean is how did the picture look to you ? Was it too bright, too dark, was it fuzzy or indistinct ?

Are you shooting RAW or JPG ? If RAW, any colour cast can be corrected in PP - if JPG, check your white balance setting. Filters, except ND or CPL, are not often used with Digital cameras.

03-24-2021, 05:47 PM	#1
coopec New Member Join Date: Mar 2021 Posts: 9	K10D lens Manual or auto? This is my first post on this forum so I'm feeling my way. I loved my Asahi Pentax film camera when I was traveling but when I went digital I switched to Canon. When the Canon broke down I thought I'd go back to Pentax (but without spending too much money) I bought a K10D (body only) and had planned to use the old Asahi Pentax lenses with an adapter. However I then decided to buy a Sigma 18-50mm lens and through a couple of deals on eBay I am now a proud owner of: K10D K100D Sigma 18-50mm (Manual) Sigma 18-50mm (Auto I plan to use the K10D but I'm not too sure whether I should retain the manual or auto lens. Apparently professionals would use the manual (I am not a professional!) as auto lenses are not good in low light conditions. Should I keep the manual or auto lens and give the other lens (plus K100D) to my son? Thanks in advance

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03-24-2021, 05:57 PM	#2
MarkJerling Moderator Site Supporter Join Date: May 2012 Location: Wairarapa, New Zealand Photos: Gallery \| Albums Posts: 20,402	Welcome to the forum! There are a number of different Sigma 18-50mm lenses so it's not clear from your post which models you have. Some get better reviews than other. When you say "Auto", do you mean autofocus (AF), or do you mean a manual lens with an A (auto) setting for the aperture ring? Gifting the one body and lens to your son seems like a good idea if your son is also interested in photography. I gave my K5 and some lenses to my daughter.

03-24-2021, 05:59 PM - 1 Like	#3
MarkJerling Moderator Site Supporter Join Date: May 2012 Location: Wairarapa, New Zealand Photos: Gallery \| Albums Posts: 20,402	Here's some different Sigma 18-50mm lenses: Sigma 18-50mm F2.8 DC EX Lens Reviews - Sigma Lenses - Pentax Lens Review Database Sigma 18-50mm F2.8 EX DC Macro Lens Reviews - Sigma Lenses - Pentax Lens Review Database Sigma 18-50mm F2.8-4.5 DC OS HSM Lens Reviews - Sigma Lenses - Pentax Lens Review Database Sigma 18-50mm F3.5-5.6 DC Lens Reviews - Sigma Lenses - Pentax Lens Review Database

03-24-2021, 06:00 PM	#4
aslyfox Seeker of Knowledge Join Date: Aug 2016 Location: Topeka, Kansas Photos: Gallery \| Albums Posts: 24,581	welcome to the forums you will find friendly members and a lot of knowledge here this chart can be used to show how lenses work with your K 10D and K 100D Quote: Pentax K-mount Lens Compatibility Chart Copyright 2006-2020 Mosphotos.com. All rights reserved. The Pentax K-mount Camera Lens Compatibility Chart you may be able to find your lenses: Sigma 18-50mm (Manual) Sigma 18-50mm (Auto) by looking for them here: Sigma Lenses - Pentax Lens Review Database look for information about your K 10d and K 100D here: Pentax K10D - Pentax K-mount DSLRs - Pentax Camera Reviews and Specifications Pentax K100D - Pentax K-mount DSLRs - Pentax Camera Reviews and Specifications

03-24-2021, 06:14 PM	#5
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,991	Originally posted by coopec Apparently professionals would use the manual (I am not a professional!) as auto lenses are not good in low light conditions. It's not quite clear what you mean by 'auto' or 'manual' but I don't think are many (if any) professionals using a manual lens these days. I suppose 30 years ago a manual lens might be used by a pro with 'auto' reserved for those mere mortals who needed the help. However, these days nearly all modern lenses are completely "auto".

03-24-2021, 06:26 PM	#6
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,525	What model was you old Pentax film camera? You shouldn't need an adapter unless it was screwmount. What lenses do you have from your film system?

03-24-2021, 06:26 PM	#7
builttospill Pentaxian Join Date: Jun 2009 Location: Utah, Idaho Photos: Gallery Posts: 2,398	I'd suggest taking few photos in different locations with each lens and keep the one giving you the best results. You'll notice fairly quickly which ones you like the best and they'll be your favorites in a collection of lenses. Welcome to the forum. I love the K10D and still occasionally use mine bought new so many years ago.

03-24-2021, 09:20 PM	#8
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,385	What is the aperture of each lens?

03-24-2021, 09:31 PM	#9
coopec New Member Join Date: Mar 2021 Posts: 9 Original Poster	Originally posted by Not a Number What model was you old Pentax film camera? You shouldn't need an adapter unless it was screwmount. What lenses do you have from your film system? Yes it was a screw mount It was bought in Suva in1973. I think they may call it M42? ---------- Post added 03-24-21 at 10:08 PM ---------- Originally posted by MarkJerling Welcome to the forum! There are a number of different Sigma 18-50mm lenses so it's not clear from your post which models you have. Some get better reviews than other. When you say "Auto", do you mean autofocus (AF), or do you mean a manual lens with an A (auto) setting for the aperture ring? Gifting the one body and lens to your son seems like a good idea if your son is also interested in photography. I gave my K5 and some lenses to my daughter. I meant Auto focus. I'm sorry. Looking at the 18-50mm lenses again they are exactly the same SIGMA ZOOM 18-50mm 1:3.5-5.6 DC Ø58 Lens made in Japan SIGMA ZOOM 18-50mm 1:3.5-5.6 DC Ø58 Lens made in Japan I bought a third lenswhich is auto zoom. Tristar Auto Zoom MC 1:3.8 f=75~150mm No.818592 49Ø By turning the body of the lens it zooms in and out but it is auto zoom? Maybe both? I've done lots of googles on "Tristar" and as far as I can make out they only made filters. (I only paid $10 plus postage for the lens so I suppose I can't expect too much) Thank you for all the links: I've got a lot of reading to do. I am finding the YouTube tutorials a big help (I've just have to find time)

03-25-2021, 02:26 AM	#11
35mmfilmfan Pentaxian Join Date: Oct 2016 Location: Norfolk, UK Posts: 4,317	Can you be more specific when you say 'it didn't work', please ? Was it exposure, focus, depth of field, camera shake or some other factor ?

03-25-2021, 03:59 AM	#12
coopec New Member Join Date: Mar 2021 Posts: 9 Original Poster	Originally posted by 35mmfilmfan Can you be more specific when you say 'it didn't work', please ? Was it exposure, focus, depth of field, camera shake or some other factor ? There is no record of it on the SD Card although when I pressed the button I saw a "flash". I really don't know why "it didn't work". I took both photos with exactly the same settings. But not to worry, I'm working like a one armed wall-paper hanger right now so I haven't had a chance to look at the YouTube tutorials. That photo I took with the island in the background looks a little yellow. Are there some filters I should have in my "kit"? Thanks you for your help.

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03-25-2021, 04:38 AM	#13
aslyfox Seeker of Knowledge Join Date: Aug 2016 Location: Topeka, Kansas Photos: Gallery \| Albums Posts: 24,581	my recommendation add to your reading list the manuals http://www.ricoh-imaging.co.jp/english/support/man-pdf/k100d.pdf http://www.ricoh-imaging.co.jp/english/support/man-pdf/k10d.pdf and move them to the top of the list

03-25-2021, 05:03 AM	#14
coopec New Member Join Date: Mar 2021 Posts: 9 Original Poster	No doubt a good move to read the manual first but a much as I'd like to become an expert photographer I have lot more pressing needs right now. (Trying to get a yacht into the water). You guys have been a big help. Now it is over to me to watch the YouTube tutorials to get a basic understanding.

03-25-2021, 05:24 AM	#15
35mmfilmfan Pentaxian Join Date: Oct 2016 Location: Norfolk, UK Posts: 4,317	All the parameters you set should be available in the EXIF data, but what I mean is how did the picture look to you ? Was it too bright, too dark, was it fuzzy or indistinct ? Are you shooting RAW or JPG ? If RAW, any colour cast can be corrected in PP - if JPG, check your white balance setting. Filters, except ND or CPL, are not often used with Digital cameras.